CN106137414B - Method and system for determining target dentition placement - Google Patents

Abstract

The present invention provides a method and system for determining a target dentition layout, the method comprising the steps of: receiving a raw data set representing the original dentition layout, the raw data set comprising raw data representing at least one key tooth a data set of positions; obtaining a set of parameters representing the structure of the head; using the set of parameters, determining a set of data representing the target position of the at least one key tooth based on the data set representing the original position of the at least one key tooth; and according to The dataset representing the target location of the at least one key tooth produces a target dataset representing the target dentition layout. The above method and system not only allow fast, convenient, automatic or semi-automatic determination of the target dentition layout, but also integrate the concept of bio-integrity into the design of fixed orthodontics and invisible orthodontic computer teeth arrangement, and improve the biological safety of orthodontic design. , reasonableness and validity.

Description

Method and system for determining target dentition placement

technical field

The present invention generally relates to the technical field of orthodontics, and in particular, the present invention relates to a method and system for determining a target dentition layout according to target positions of several key teeth.

Background technique

Dental malformation is one of the three major diseases of the oral cavity, with a high prevalence rate. Traditional orthodontic treatment methods mostly use fixed brackets that are bonded to the teeth. Compared with the traditional fixed bracket orthodontic technology, the new invisible orthodontic technology does not require brackets and wires, but uses a series of invisible aligners, which are made of safe elastic and transparent polymer materials, making The orthodontic process is almost completed without anyone noticing it, and it will not affect daily life and social interaction; and because the patient can wear it by himself, oral hygiene can be maintained normally; The clinical operation is greatly simplified, and the entire correction process saves time and effort.

Whether it is traditional fixed orthodontic treatment or the recently developed invisible orthodontic treatment, it involves the design or prediction of the target position of the dentition after orthodontic treatment. Especially in the design of some invisible appliances, the current dentition layout image of the patient is first collected, and the final dentition layout is manually determined by the doctor according to the original dentition layout, that is, the final target position of the dentition (also known as the dentition position). column target location) is determined solely by the physician's experience. Then the doctor or designer performs linear or nonlinear interpolation calculation between the original dentition layout and the final dentition layout by means of computer-aided design, so as to obtain a plurality of intermediate dentition layouts, thereby manufacturing a series of invisible orthodontics device.

Although it is an intuitive approach to set a target position based on the initial position and then produce an intermediate position, the current method for determining the target position is to mechanically simulate the tooth arrangement target by the designer as required by the clinician. Position, while the designer mainly considers the mechanical movement and mathematical issues of the teeth in the design of the tooth arrangement, and hardly takes into account the angle/position relationship between the root and the alveolar bone, the health of the oral soft and hard tissues, and the overall biological health of the joints. Sexual structure and facial aesthetics. Moreover, the level of clinicians is different, and the degree of control over the results of the teeth arrangement is uneven; therefore, the appliance worn by the patient is likely to fail to achieve good orthodontic effect due to the lack of control ability of the clinician's medical technology and aesthetic principles. The treatment period is prolonged.

Further, the predetermined target position is not necessarily a medically reachable or reasonably reachable target position, so that it is impossible or difficult to achieve the above-mentioned manually determined target position in medicine.

Therefore, there is a need for a method and system for determining a target dentition placement that is compliant with medical and aesthetic rules and that is practical.

SUMMARY OF THE INVENTION

Accordingly, the present invention proposes a method and system for digitally determining a target dentition layout, which is based on several key teeth, first determines the position of the key teeth by using parameters representing the head structure, and then determines the position of the key teeth based on the determined key teeth. The position of the teeth, determine the position of the entire maxillary and/or mandibular dentition, thus making it possible to integrate the concept of bio-integrity into the design of fixed orthodontic and invisible orthodontic computer teeth arrangement.

Accordingly, according to one aspect of the present invention, there is provided a method for determining a target dentition layout, comprising the steps of: receiving a raw data set representing an original dentition layout, the raw data set comprising at least one a data set of the original positions of the key teeth; obtaining a parameter set representing the structure of the head; using the parameter set to determine the data representing the target position of the at least one key tooth based on the data set representing the original position of the at least one key tooth and generating a target data set representative of the target dentition layout based on the data set representative of the target position of the at least one key tooth.

According to a specific embodiment of the present invention, the raw data set includes data representing at least one of a maxillary raw dentition layout and a mandibular raw dentition layout. The parameter set representing the head structure includes at least one of a cephalometric parameter measurement data set, a dental image measurement data set, and a dental parameter standard value set.

Further, according to a specific embodiment of the present invention, the at least one key tooth includes a maxillary first molar, and the data set representing the target position of the at least one key tooth includes a vertical target position of the maxillary first molar .

And, when the maxillary first molar is pathologically elongated, the at least one key tooth includes a maxillary first premolar or a maxillary second premolar, and the data representing the target position of the at least one key tooth The set includes the vertical target position of the maxillary first premolar or the maxillary second premolar.

Wherein, according to a specific embodiment of the present invention, the parameter set representing the head structure includes a cephalometric parameter measurement data set and a standard value set of the corresponding cephalometric parameter, and the method further includes: by comparing the cephalometric parameters The measured data of the parameters and the standard values of the corresponding cephalometric parameters determine the vertical target position of the maxillary first molar.

Preferably, the cephalometric parameters include the intersection angle between the eye-ear plane and the mandibular plane (FMA), the intersection angle between the anterior skull base plane and the mandibular plane (SN-MP), and the posterior-anterior height ratio (S-Go/N-Me) at least one of the.

While the target data set includes data representing the vertical target position of the maxillary dentition, the method further includes: according to the data representing the vertical target position of the maxillary first molar, using the data representing the vertical target position of the maxillary first molar and the maxillary first molar The occlusal plane formed by the incisors determines the data representing the vertical target position of the maxillary dentition.

And, the target data set further includes data representing the vertical target position of the mandibular dentition, and the method further includes: according to the data representing the vertical target position of the maxillary dentition, using the data representing the vertical target position of the maxillary teeth and the corresponding mandibular teeth. Overbite coverage, or occlusal relationship, determines the data representing the vertical target position of the mandibular dentition.

According to yet another specific embodiment of the present invention, the at least one key tooth includes a mandibular canine and a mandibular first molar, and the data set representing the target position of the at least one key tooth includes a mandibular canine and a mandibular first molar. Lateral target position of a molar.

Wherein, according to a specific embodiment of the present invention, the parameter set representing the head structure includes a lateral position measurement data set and a reference data set of the mandibular canines and mandibular first molars, and the method further includes: based on The lateral position measurement data set and the reference data set of the mandibular canines and mandibular first molars are used to determine the lateral target positions of the mandibular canines and mandibular first molars.

Preferably, the lateral position measurement data set and the reference data set of the mandibular canines and mandibular first molars include any one of the following data sets: representative of the mandibular canines and mandibular first molars determined according to the CT image of the alveolar base bone A dataset representing the relationship between the lateral position of the first molar and the position of the alveolar base, a dataset representing the positional relationship between the WALA ridge of the mandibular dentition and the FA points of the mandibular canine and mandibular first molar, and a dataset representing the mandibular canine and mandible Dataset and standard set of lateral position measurements of first molars.

While the target dataset includes data representing the lateral target positions of the mandibular dentition, the method further includes: using the data representing the lateral target positions of the mandibular canines and mandibular first molars, using The mandibular occlusal curve fitted by the first molar and the mandibular central incisor determines the data representing the lateral target position of the mandibular dentition.

Furthermore, the target data set further includes data representing the lateral target position of the maxillary dentition, and the method further includes: obtaining a mirror image of the maxillary occlusal curve according to the mandibular occlusal curve, and determining the lateral target position representing the maxillary dentition The data.

According to yet another specific embodiment of the present invention, the at least one key tooth includes a mandibular central incisor, and the data set representing the target positions of the at least one key tooth includes anterior-posterior target positions of the mandibular central incisor.

Wherein, according to a specific embodiment of the present invention, the parameter set representing the head structure includes an anterior-posterior position measurement data set and a reference data set of the mandibular central incisor, and the method further includes: based on the mandibular central incisor The anteroposterior position measurement data set and the reference data set of the central incisor determine the anteroposterior target position of the mandibular central incisor.

Preferably, the anterior-posterior position measurement data set and the reference data set of the mandibular central incisor include any one of the following data sets: the anterior-posterior position of the mandibular central incisor determined according to the alveolar base CT image and A data set of the relationship between the position of the alveolar base bone, a data set of the positional relationship of the WALA ridge representing the mandibular dentition and the FA point of the mandibular central incisor, and a cephalometric parameter measurement data set and a standard value set of the corresponding cephalometric parameters.

For example, the cephalometric parameters include the lower central incisor-mandibular plane angle (IMPA), the included angle between the long axes of the upper and lower central incisors (U1-L1), and the included angle between the long axis of the lower central incisor and the line connecting the NB (L1 -NB angle), the vertical distance between the incisal edge of the lower central incisor and the NB line (L1-NB line distance), the convex distance of the upper central incisor (AP-L1) and the convex distance of the lower central incisor (NP-L1) At least one, wherein the line connecting NB is the line connecting the nasion point and the lower alveolar seat point.

While the target data set includes data representing the anteroposterior target position of the mandibular dentition, the method further includes: according to the data representing the anteroposterior target position of the mandibular central incisor, using the mandibular canine and the mandibular first The mandibular occlusal curve fitted by the molars and mandibular central incisors determines the data representing the anteroposterior target position of the mandibular dentition.

In addition, the target data set further includes data representing the front-to-back target position of the maxillary dentition, and the method further includes: obtaining a mirror image of the maxillary occlusal curve according to the mandibular occlusal curve, and determining the anterior-posterior direction representing the maxillary dentition. target location data.

Finally, according to still another specific embodiment of the present invention, the at least one key tooth includes a maxillary first molar, a mandibular canine, a mandibular first molar, and a mandibular central incisor, and the at least one key tooth represents at least one key tooth. The target position dataset includes vertical target positions of maxillary first molars, lateral target positions of mandibular canines and mandibular first molars, and anteroposterior target positions of mandibular central incisors, and the target dataset includes representative maxillary Vertical, lateral, and anteroposterior target position data for dentition and mandibular dentition.

Wherein, the method further includes: using the mandibular canines, mandibular first molars and mandibular central incisors, fitting to obtain a mandibular occlusal curve; according to the mandibular occlusal curve, determining the anteroposterior and lateral target positions; based on the mandibular occlusal curve, generating a mirrored maxillary occlusal curve; and determining an anteroposterior and lateral target position for each tooth of the maxillary dentition.

Preferably, the method further comprises: adjusting the target position of each tooth of the mandibular dentition, so that the torque and axial inclination of each tooth of the mandibular dentition must be equal to or substantially equal to standard values, and each tooth The twist angle is not greater than a certain threshold.

Moreover, the method further includes: adjusting the target position of each tooth of the maxillary dentition, so that the torque and the axial inclination angle of each tooth of the maxillary dentition are equal to or substantially equal to standard values, and each tooth The torsion angle is based on the uniform coverage of the corresponding mandibular teeth and the good fit of the cusps.

In addition, the method further includes: moving the position of the upper and lower jaw dentition as a whole according to the joint parameters, so as to obtain a target data set reflecting the joint parameters.

Preferably, the overall movement includes: adjusting the vertical, lateral and anterior-posterior target positions of the upper and lower dentition, so that when the upper and lower dentition is in the maximum cusp contact position, the mandibular condyle is in the articular fossa. The measured data of the location is equal to or close to the standard value.

In addition, the method further includes: adjusting the central incisors, canines and first molars of the upper and lower jaws based on the lip-facial aesthetic indexes to obtain a target dataset reflecting the aesthetic indexes.

Moreover, the method may further include: adjusting the target data set according to the correction means and correction limits corresponding to the correction tools.

Preferably, the method is implemented by a computer.

Accordingly, according to another aspect of the present invention, there is also provided a system for determining a target dentition layout, comprising: an input unit for receiving an original data set representing the original dentition layout and obtaining a representative head a parameter set of the structure, the raw data set comprising a data set representing the original position of the at least one key tooth; a controller for utilizing the parameter set based on the data set representing the original position of the at least one key tooth, determining a data set representing a target location of at least one key tooth; and generating a target data set representing a target dentition layout based on the data set representing the target location of the at least one key tooth.

Accordingly, by applying the method and system of the present invention, the target position of the entire maxillary and/or mandibular dentition is determined by utilizing several key teeth, thereby allowing a fast, convenient, automated or semi-automated determination of the target dentition layout , to improve the teeth row efficiency.

Further, the present invention can quickly and accurately determine the desired and obtainable target dentition positions after orthodontic treatment according to biological integrity factors such as the patient's original tooth arrangement, alveolar bone, and facial structure.

Finally, the method of the present invention makes it possible to incorporate the concept of biological holistic orthodontic treatment into the design of fixed orthodontic treatment and invisible orthodontic treatment, and improves the biological safety, rationality and effectiveness of orthodontic treatment design.

Description of drawings

The above-mentioned and other features of the present invention will be further explained below with reference to the accompanying drawings and the detailed description. It should be understood that these drawings only illustrate several exemplary embodiments according to the present invention, and therefore should not be construed as limiting the scope of protection of the present invention. Unless stated otherwise, the drawings are not necessarily to scale and like numerals refer to like parts.

1 shows a flowchart of a method for determining a target dentition layout according to an embodiment of the present invention;

2A-2D are schematic diagrams for explaining cephalometric parameters according to a specific embodiment of the present invention;

Fig. 3 is a tooth position map according to a specific embodiment of the present invention;

4A-4C are schematic diagrams for explaining the cephalogram angle FMA, SN-MP and cephalogram ratio S-Go/N-Me respectively according to a specific embodiment of the present invention;

5 is a schematic diagram for illustrating the relationship between the WALA ridge and the FA point according to a specific embodiment of the present invention;

Figure 6 shows an occlusal curve diagram according to an embodiment of the present invention;

7A-7B are schematic diagrams for illustrating tooth torque and its standard value according to an embodiment of the present invention;

8A-8B are schematic diagrams for explaining the axial inclination of a tooth and its standard value according to a specific embodiment of the present invention;

9A-9B are schematic diagrams for illustrating the positional relationship between joints and dentition according to an embodiment of the present invention;

Figure 10 shows a schematic diagram of a computer system according to an embodiment of the present invention.

Detailed ways

In the following detailed description, reference is made to the accompanying drawings which form a part of this specification. The schematic embodiments mentioned in the description and drawings are for illustrative purposes only, and are not intended to limit the protection scope of the present invention. It will be understood by those skilled in the art that many other embodiments may be utilized and various changes may be made to the described embodiments without departing from the spirit and scope of the present invention. It should be understood that the various aspects of the invention described and illustrated herein may be arranged, substituted, combined, separated and designed in many different configurations, all of which are encompassed by the present invention.

The present invention provides a method and a system for determining a target dentition layout. By applying the method and system of the present invention, the patient's original tooth arrangement, alveolar bone, facial structure and other biological integrity factors can be quickly and accurately determined. Determining the desired and attainable target dentition layout after orthodontic treatment, which makes it possible to incorporate the concept of bio-integrity into fixed orthodontics and orthodontic computer arrangement design, and allows patients to fully understand orthodontic treatment before orthodontic treatment begins Therefore, the biological safety, rationality and effectiveness of dental treatment design are improved.

For orthodontics, it is very important to determine the target dentition layout after orthodontic treatment, especially the target position of each tooth on the dentition. Especially for some tooth arrangement methods, it is necessary to determine the target position of the teeth after orthodontic treatment, and then determine the tooth position corresponding to each tooth arrangement stage, and then design the corresponding dental appliance for each tooth arrangement stage. The target position of each tooth in a reasonable dentition in accordance with medical regulations is very important. However, at present, the clinician determines the target position of the teeth according to personal experience, and then the teeth arrangement operator manually moves each tooth according to the doctor's instructions to determine the target position of each tooth on the dentition. Because clinicians have different levels, As a result, the degree of control over the results of the teeth arrangement is uneven, so that the determined target position of the teeth cannot be optimized.

Therefore, the present invention proposes a method and system for determining the target dentition layout based on "key teeth", and, according to a specific embodiment of the present invention, the above method and system allow fast, convenient, automatic or semi-automatic Determining the target dentition layout is particularly suitable for determining the target dentition layout through a computer system. Hereinafter, the present invention will be exemplarily explained with reference to FIG. 1 .

FIG. 1 shows a flowchart of a method for determining a target dentition layout according to an embodiment of the present invention. In the method shown in FIG. 1 , an original data set representing the original dentition layout is first received in step S100, wherein the original data set includes the original dentition (at least one tooth of the upper and lower jaws, preferably the upper and lower jaws all teeth), so the original dataset includes a dataset representing the original location of at least one key tooth. They will be explained separately below.

For example, the data of the original dentition is, for example, the data of the original dentition of the patient. Wherein, the original dentition layout of the patient (also referred to as original dentition, current dentition or current dentition layout) represents the original shape and position of each tooth included in the patient's dentition before orthodontic treatment.

The data representing the original dentition layout, eg, a digital model representing the original dentition layout, can be generated by a variety of methods. For example, the dentition state can be obtained by taking an impression, thereby generating a physical dental model. The images of the teeth, or the teeth and their surrounding tissues can also be directly obtained by methods such as optical scanning, X-ray imaging, ultrasonic imaging, three-dimensional photography, three-dimensional videography, medical CT scanning or nuclear magnetic resonance. Further, the collected dentition layout, or the state of the teeth and their surrounding tissues can be converted into a dentition layout data set by scanning the physical dental model or by computer processing the oral tissue images. X, Y, Z coordinates in three-dimensional space, which can be visualized and manipulated (eg, translated or rotated) on a graphical interface of a computer system. Here, the digital model representing the original dentition layout may be the maxillary dentition of the original dentition layout and/or the mandibular dentition of the original dentition layout.

In general, a gypsum model of the patient's dentition is obtained by means of an impression using well-known techniques, and then the gypsum model of the patient's dentition is scanned by a scanner, thereby generating a dentition layout dataset. The scanners may include, for example, non-contact laser scanners, contact laser scanners, and the like. And the datasets produced by the scanner may be in any of a variety of digital formats, ensuring compatibility with software.

It should be noted that the present invention does not limit the method used to obtain the original dentition layout. For example, data on the original dentition layout can also be obtained through an intraoral imaging system. An intraoral imaging system is a diagnostic device that allows a dental practitioner to see inside a patient's mouth and display the surface shape characteristics of the teeth on a display monitor. Certain three-dimensional (3D) intraoral imagers may include an intraoral camera with a light source. A three-dimensional intraoral imager can be inserted into a patient's mouth by a dental practitioner. After the intraoral imager is inserted into the mouth, the dental practitioner can capture images of the visible parts of the teeth and gums. And the images captured by the intraoral camera can be displayed on a display monitor and can be transmitted to a computing device to obtain data on the original dentition layout.

Furthermore, the dentition layout may include not only the state of the crown but also the state of the root. For example, data on the root and surrounding tissue can be acquired by 2D or 3D X-ray systems, CT scanners and MRI equipment.

Because the digital model representing the original dentition layout can be the maxillary dentition of the original dentition layout and/or the mandibular dentition of the original dentition layout, if the digital model representing the original dentition layout is the maxillary dentition and/or the original dentition layout mandibular dentition, then the paraffin impression of the patient can be used to obtain the relative position of the maxillary and mandibular dentition in a centric occlusion. For example, for laser scanning, a paraffin bite can be placed on a plaster cast of the patient's current mandibular dentition, followed by the paraffin bite, followed by placement of the maxillary dentition on the mandibular dentition, so that the maxillary and maxillary dentition The relative position is determined according to the paraffin bite mark, and laser scanning is performed at this time, so that the upper and lower dentition models representing the same relative position as the patient's oral cavity can be obtained. Of course, it is also possible to scan the paraffin bite print alone, and combine the data from the scanned paraffin bite print with the data obtained by scanning the plaster model to obtain a digital model of the maxillary and mandibular dentition representing the patient's original dentition layout.

And, in this step, a digital model of each tooth can be further obtained based on the obtained digital model of the dentition. That is, the above-mentioned digital model of the maxillary dentition and/or mandibular dentition obtained by scanning can be divided into digital models of each tooth by automatic segmentation, manual segmentation, or a combination of automatic and manual segmentation. The coordinates of the tooth.

Of course, in step S100, as described above, according to a specific implementation manner, the digital model of the entire maxillary dentition and/or the mandibular dentition may be obtained first and then divided into digital models of each tooth. According to another specific embodiment, the plaster model of the dentition obtained by the impression can also be segmented first to obtain a plaster model of a single tooth, and the position of each tooth in the dentition or the distance between the teeth is recorded. The mutual positional relationship, and then scan each tooth to obtain a digital model of each tooth, and then obtain the entire tooth in the computer according to the recorded position of each tooth in the dentition or the mutual positional relationship between the teeth Columns, which are digital models representing the patient's original dentition layout. The above-mentioned specific embodiments are all exemplary rather than limiting, so as long as a method for obtaining a digital model representing the original dentition layout of a patient falls within the protection scope of the present invention.

And, in step S110, a parameter set representing the structure of the header is obtained. It should be noted that the execution order of step 100 and step 110 can be exchanged, and the two steps can also be performed simultaneously or combined. The present invention does not impose any limitation on the execution order or manner of the above two steps.

The set of parameters representing the structure of the head may include a cephalometric dataset. Further, preferably, it may also include a dental statistical parameter set, parameters obtained based on CT images of teeth and head structures, and the like.

The following will first describe the cephalogram dataset. Generally speaking, there are mainly two types of measurement of jaw and skull model: contact measurement and non-contact measurement. Contact measurement is mainly used for direct contact measurement of dental and jaw models through various measuring instruments, and is further divided into manual contact measurement and needle-contact mechanical measurement. Among them, manual measurement is a traditional measurement method, which is still widely used at present. The main tools are: ruler, sub-ruler, vernier caliper and universal angle ruler. It is a two-dimensional measurement method with low cost and is suitable for clinical individual The advantage of model measurement, but the disadvantage is that due to the hard tool used, anhydrite must be poured, and a large amount of space is required to store the model, which is time-consuming and labor-intensive, and the accuracy is not high.

The non-contact measurement is to reconstruct the three-dimensional image of the dental model through optical instruments and computer software, and its fine structure is clearly discernible. Three-dimensional coordinate extraction, measurement and analysis of the distance between any two points in space, any angle, arc length and surface area, etc., make it possible to manually measure the indicators that cannot be involved, and it is convenient and intuitive. In 1931, Broadbent in the United States and Hofranth in Germany established the X-ray head positioning measurement method, and X-ray frontal and lateral film analysis became an important method to study the teeth and jaws and head models. With the development of computer technology, cephalometric measurement has developed from the initial manual tracing point measurement to the current exploration of fully automated image measurement and analysis, improving the accuracy and efficiency. Moreover, computer cephalometric analysis methods and corresponding software have been produced at home and abroad, such as WinCeph, OnyxCeph and other digital cephalometric software.

However, it should be noted that the present invention is not limited to the method of obtaining cephalogram data by X-ray. With the development of imaging technologies such as CT and MRI, more accurate cephalometric data can be obtained. For example, by combining cone beam tomography (CBCT) with a digital computer, images of teeth and surrounding bone structures, soft tissues, muscles, blood vessels, etc. can be obtained. During a CBCT scan, the CBCT scanner rotates around the patient's head and obtains hundreds of different CBCT images, which may be referred to as CBCT images. CBCT images can be transmitted to a computing device so that three-dimensional anatomical data can be generated. The 3D anatomical data can then be manipulated and visualized with special software for cephalometric analysis of CBCT images.

Hereinafter, the process of obtaining cephalogram data by X-rays will be described as an example. As shown in Figures 2A-2B, first, through the X-ray imaging technology, under the strict positioning of the head locator, the lateral head image as shown in Figure 2A is obtained, and it is input into the computer, so as to obtain the head Structure of the original dataset.

Then, for example, after obtaining a digital cephalometric cephalometric image, digital cephalometric software, such as WinCeph software (as shown in FIG. 2B to obtain cephalometric lines based on the X-ray cephalometric image) can be used to obtain the cephalometric image as shown in FIG. 2C picture. It should be noted that, although the method of digital software will be used as an example to introduce the present invention, the present invention does not exclude the method of manual contact measurement or manual drawing of cephalogram.

In medicine, various scholars have proposed different cephalometric methods and corresponding cephalometric marker points, marker planes and marker angles. For example, common cephalometric landmarks include: cranial landmarks (for example, including S. sella and P. porion, etc.), maxillary landmarks (for example, including upper alveolar border (SPr) .superiorprosthion) and upper central incisor (UI.upper incisor, etc.), mandibular landmarks (for example, including condyle vertex (Co.condylion) and lower incisor (Li.lower incisor), etc.), soft tissue lateral landmarks (for example, Including eye point (E.eye), soft tissue nasion point (NS nasion of soft tissue) and lip edge point (vermilion borders, etc.).

Moreover, the commonly used marking planes include a reference plane and a measurement plane, wherein the reference plane is a relatively stable plane in cephalometric measurement. The most commonly used datum planes are the anterior skull base plane (SN), the eye-ear plane (FH), and the esthetic plane (EP). The measurement planes include the palatal plane (ANS-PNS), the total skull base plane (Ba-N), the occlusal plane (OP), and the mandibular plane (MP). In this way, 8 measurement items such as angle, line distance and ratio are formed between the reference plane, each measurement mark point and other measurement planes.

For example, as shown in Figure 2D, 1 represents the anterior skull base plane; 2 represents the eye and ear plane; 3 represents the occlusal plane; 4 represents the mandibular plane; and 5 represents the aesthetic plane.

Further, the cephalometric angle can be determined. Commonly used cephalometric angles include: SNA angle (the angle formed by the center of the sella, the nasion point and the upper alveolar seat point), NP-FH (also known as the face angle, that is, the face plane NP and the eye and ear plane FH) The lower angle after the intersection), SN-MP (the angle between the anterior skull base plane and the mandibular plane), MP-FH (also known as the mandibular plane angle, which is the angle between the mandibular plane (MP) and the eye-ear plane (FH)), 1〖TXX-〗-SN angle (the lower inner angle where the long axis of the upper central incisor intersects the SN plane), 1〖TX-〗-MP angle (the upper inner angle where the long axis of the lower central incisor intersects the mandibular plane) and FMA ( The angle between the eye and ear plane and the mandibular plane) and so on.

The commonly used line distances for cephalometric measurement include: ANS-Me (lower front height); S-Go (back height); N-Me (front height), and commonly used ratios include S-Go/N-Me (back-front) High ratio), ANS-Me/N-Me (bottom-front high ratio), etc.

It should be noted that each of the above measurement items has its specific meaning, indicating the characteristics or growth trend of the corresponding structure. However, evaluating an indicator in isolation often leads to erroneous conclusions. Because the skull is a complex composed of various parts of the teeth, jaws, and craniofacial structures. Whether it is normal or not depends entirely on a certain indicator: it depends on the cooperation between various parts, so it needs to be considered comprehensively. The dentition deformity is due to the imbalance between the dentition and the craniofacial parts.

Therefore, the present invention proposes a method for designing the position of the dentition after orthodontic treatment by measuring various cephalometric parameters, and mainly using the cephalometric parameters in combination with other parameters, so that the angle/position relationship between the root and the alveolar bone can be calculated. Bio-integrative structural issues such as oral soft and hard tissue health and joint health as well as facial aesthetic issues are comprehensively considered to design dentition target positions that are in line with clinical medicine and aesthetics.

Further, in step S120, using the parameter set, based on the data set representing the original position of the at least one key tooth, a data set representing the target position of the at least one key tooth and representing the target position of the at least one key tooth is determined . And, further, in step S130, according to the data set representing the target position of at least one key tooth, a target data set representing the target dentition layout representing the target position of the original dentition is determined.

Here, firstly, the present invention proposes a concept of "key teeth", which refers to one or several teeth included in the dentition, which play an important role in determining the position of the entire dentition. As for the determination of the target position after the original dentition treatment, it includes the determination of the target position on the vertical, lateral and anterior-posterior three-dimensional space coordinates. Therefore, how to determine the target position in each direction will be described in detail below.

1. Determine the vertical positioning of the row of teeth

First, according to an embodiment of the present invention, the target position includes a vertical target position, and in order to determine the vertical target position of the entire dentition, the maxillary first molar is selected as the key tooth. Therefore, in the first specific embodiment, in step S120, it is necessary to use the obtained parameter set to determine the target position representing the target position of at least one key tooth that represents the desired vertical target position of the maxillary first molar after orthodontic treatment. data set.

As mentioned above, there are many parameters obtained by cephalometric measurement. In a specific embodiment of the present invention, the cephalometric angle FMA and SN-MP, and the cephalometric ratio S-Go/N-Me are selected as the main parameters to determine the desired vertical target position of the maxillary first molar after orthodontic treatment.

FIG. 3 shows a dental map of the entire dentition of a normal person, wherein each tooth is marked with a specific number. However, it should be noted that the dentition of some patients or adolescents does not contain all the teeth as shown in FIG. 3 , and FIG. 3 is only used to illustrate the positions of the teeth, and not used to limit the present invention.

Wherein, the maxillary first molars include the molars whose tooth position number is 16 or 26 (ie, the left or right maxillary first molars). Here, preferably, the vertical positions of the left and right maxillary first molars are adjusted to be substantially consistent, and then the vertical position of the entire dentition is determined according to the vertical position of the left or right maxillary first molars. However, only the left maxillary first molar can be used to determine the vertical position of the entire dentition, or the right maxillary first molar can be used to determine the vertical position of the entire dentition, which is not limited in the present invention.

First, FMA is the intersection angle between the eye-ear plane and the mandibular plane, as shown in Figure 4A. The FMA angles of normal and ethnic groups are basically very close. For example, according to the Tweed analysis method, it can be determined that the average measured FMA of normal Chinese is 31.3 degrees (standard deviation is 5.0 degrees).

The SN-MP is the intersection angle between the anterior skull base plane and the mandibular plane, as shown in Figure 4B. Similarly, the SN-MP angles of normal and ethnic groups are basically close. For example, the mean value of SN-MP measurements in normal Chinese people in the mixed dentition period is 35.8 degrees (standard deviation is 3.6 degrees), while the measurement of SN-MP in the permanent dentition period is 35.8 degrees. The mean is 32.5 degrees (with a standard deviation of 5.2 degrees).

If the FMA and SN-MP angles are above the average range, it is a high angle; if the FMA and SN-MP angles are below the average range, it is a low angle; on the other hand, if the FMA and SN-MP angles are within the average range , is the equal angle.

The head shadow ratio S-Go/N-Me (rear-front high ratio), as shown in Figure 4C, the normal ratio of S-Go/N-Me (rear-front high ratio) is about 62%, which is a An important indicator, if the ratio is too large, it indicates that the face grows in a horizontal sagittal direction, and vice versa, it indicates that the face grows in a vertical direction.

Therefore, the vertical position of the maxillary first molar can be determined based on the above-mentioned measured cephalometric parameters and in combination with the above-mentioned dental statistics. For example, if the patient's FMA and SN-MP angles are comprehensively judged as a high-angle or equal-angle case, the maxillary first molar cannot be designed for elongation; and if it is a low-angle case, the maxillary first molar cannot be designed for compression. enter. At the same time, the range of S-Go/N-Me was maintained around the normal ratio by adjusting the vertical position of the maxillary first molars.

It should be noted that the above design is for the cases without pathological elongation of the maxillary first molars. If the maxillary first molars have pathological elongation, the maxillary first premolars (that is, the teeth in the 14th or 24th position) Or the vertical height of the maxillary second premolar (ie, the teeth in the 15th or 25th position) instead, that is, in this case, the key tooth that determines the vertical height can be the maxillary first premolar or the maxillary second premolar.

Moreover, it is also necessary to comprehensively consider the specific situation of the case, for example, the orthodontic target should be adjusted according to the orthodontic means and the orthodontic limit contained in the tools used; the principle is: the orthodontic means and tools support the realization of tooth movement, and the design can be closer to the standard. ; If the realization of tooth movement is not supported, the limit of orthodontic means and tool support is used as the design limit, and it is as close as possible to the ideal orthodontic goal, and the minimum is to keep the original position.

Once the vertical height of the maxillary first molar is determined, in step S130, the desired vertical height after the current maxillary and maxillary dentition treatment can be determined based on the vertical height of the maxillary first molar, that is, determine the vertical height of the remaining teeth. To obtain the target data set representing the target dentition layout.

Wherein, according to a specific embodiment of the present invention, the occlusal plane (OP, also called occlusal plane) is used as a reference mark to determine the vertical height of other maxillary teeth. In stomatology, the occlusal plane is an imaginary plane. The average plane composed of the incisal edge and the occlusal surface of the teeth is not a plane in the strict sense. It represents the two-dimensional mean of these surfaces. Appropriate occlusal plane is one of the factors to ensure that the organs and tissues of the maxillofacial region are in a physiologically coordinated state.

The occlusal plane is determined by the following three points: two of which are determined by the maxillary bilateral first molars (ie teeth 16 and 26), and the third point is determined by a relatively normal maxillary central incisor (ie 11 or 26). 21 teeth) to determine (the determination of the position of the central incisor should refer to the relationship between the lips and teeth), as follows:

A. Selection of maxillary bilateral first molar points: landmark points for easy identification - optional sockets; mesial/distal marginal ridges; mesial/distal adjoining points; cusps; bracket positioning points, etc. Different marker points can be selected according to different planes.

B. Selection of maxillary central incisor points: landmark points for easy identification - optional socket; mesial/distal marginal ridge; mesial/distal abutment point; incision angle; incisal end; bracket positioning point, etc. Different marker points can be selected according to different planes.

Correspondingly, the method for determining the vertical height of the remaining maxillary teeth is as follows: if the false plane formed by the mesial incisal angle of the maxillary central incisors in the ideal position to the mesial buccal cusps of the bilateral first molars in the ideal position is used as the occlusal plane. (Some also use the mesial lingual or distal buccal cusps of bilateral second molars as the positioning point), then the positional relationship between the maxillary teeth and this plane is: maxillary central incisors, canines, and premolar buccal cusps and this plane Contact, according to the definition of different maxillary occlusal planes, the mesiobuccal cusps, mesial lingual cusps of maxillary first molars or the buccal cusps of maxillary second molars are in contact with this plane; lateral incisors are not in contact with this plane; The distance between the planes increases sequentially from front to back.

The vertical height of the mandibular teeth is determined as follows: the anterior teeth (generally speaking, the upper and lower 3-3 teeth are called anterior teeth) have a good covering relationship with the upper jaw. Overlay refers to the vertical distance that the maxillary teeth cover the labial (buccal) surface of the mandibular teeth when the cusps are staggered. 4mm; Cover refers to the horizontal distance that the maxillary teeth cover the mandibular teeth when the cusps overlap. For anterior teeth, it refers to the anterior-posterior horizontal distance between the incisal edge of the upper incisor and the incisal edge of the lower incisor, which is normally about 2-4mm. The posterior teeth (other than the anterior teeth) are arranged in the most extensive occlusal relationship with the maxillary posterior teeth.

And, finally, it needs to be adjusted according to the specific situation of the case: for example, the vertical height of anterior teeth can be adjusted accordingly with reference to the aesthetic analysis such as the smile line of the case, as well as the adjustment limits contained in the orthodontic methods and tools used; and the vertical height of the posterior teeth can be adjusted according to Correction means and the correction means used and the correction limits contained in the tools used shall be adjusted accordingly.

The general principle is: if the orthodontic means and tools support the realization of tooth movement, the design can be closer to the standard; if it does not support the realization of tooth movement, the limit of tool support is the design limit, and the ideal orthodontic goal is as close as possible, and the minimum is to maintain in situ.

2. Determine the lateral positioning of the row teeth:

And, according to another specific embodiment of the present invention, the target position includes a lateral target position, and in order to determine the lateral target position of the entire dentition, the mandibular canine (ie, the teeth at the 33rd or 43rd position) is selected. And the mandibular first molar (ie, the 36th or 46th tooth) is used as the key tooth to locate the transverse width of the entire dentition.

Therefore, in the second specific embodiment, in step S120, it is necessary to use the obtained parameter set to determine the desired lateral target position of the mandibular canine and mandibular first molar after orthodontic treatment, which represents at least one key tooth. A dataset of target locations.

Similar to the above-mentioned first specific embodiment, wherein, the mandibular first molars include molars with a tooth position number 36 or 46 (that is, the left or right mandibular first molars), and the mandibular canines include a tooth position numbered as 33 or 43 canines (ie left or right mandibular canines). Here, it is preferable that the lateral positions of the left and right mandibular first molars are adjusted to be basically symmetrical, and the lateral positions of the left and right mandibular canines are also adjusted to be basically symmetrical, and then according to the left or right mandibular first molars. The lateral position of the first molar and the left or right mandibular canine to determine the lateral position of the entire dentition.

The general principle is to determine the ideal width of mandibular canines and mandibular first molars with reference to the width of the base bone. Specifically, the ideal width positions of the mandibular canines and mandibular first molars can be determined by any one of the following three methods or a combination of several methods.

Method 1: CT sagittal section of alveolar base bone. The corresponding rule is: the root of the long axis of the mandibular canine and the mandibular first molar is located in the center of the alveolar base from the CT sagittal section. Because CT images are slice images, there are slice images of cross-section, coronal section, and sagittal section. Here, CT sagittal section is used to determine the ideal width position when the root of the long axis of the mandibular canine and the mandibular first molar is located in the center of the alveolar base bone.

Method 2: WALA Ridge (WALA Ridge, where WALA is the abbreviation of the name) Ridge.

As shown in Figure 5, WALA Ridge is the line connecting WALA Point (the most prominent point at the mucogingival symphysis), which clinically refers to the soft tissue band just above the mandibular mucogingival symphysis, which is basically on the level of the tooth rotation center. Represents the extent of the basal arch. Clinical studies found that the distance between the FA point (the most prominent point on the crown surface of each tooth) and the WALA Ridge represents the relative relationship between the tooth and the alveolar bone. Therefore, by referring to the WALA Ridge to determine the position of the tooth, the root of the tooth can be located in the middle of the alveolar bone.

The invention proposes that the distance between the FA point of the mandibular canine and the WALA Ridge is set to 0-1mm, preferably 0.6mm; the distance between the FA point of the first molar and the WALA Ridge is set to 1-3mm, preferably 2mm.

Method 3: Statistical width of mandibular canines and mandibular first molars. Among them, statistical width: refer to the statistics of the width between mandibular canines and mandibular first molars reported in various literatures.

For statistical width, refer to the statistics of the width between mandibular canines and mandibular first molars reported in various literatures. For example, you can refer to "Study on the measurement of normal occlusal teeth and dental arches in Jiangsu, Gu Yan et al., Stomatology, March 2010, Vol. 30, No. 3" or "Crop, arch width and Bolton index of normal occlusal youth" Measurement, Guo Yi et al., Journal of Tianjin Medical University, 2004, No. 2" and so on.

In conclusion, the lateral positions of the mandibular canines and the mandibular first molars can be determined according to any one of the above three methods or a comprehensive consideration of the three methods.

And, it needs to be adjusted according to the specific situation of the case. For example, according to the correction methods and the correction limits contained in the tools used, the correction goals are adjusted accordingly. Among them, the principle is: for canines with no obvious dislocation before treatment, try to keep the width of the canines the same before and after treatment; for canines with obvious dislocation before treatment, if the treatment means and tools support the realization of tooth movement, the design can be closer to the standard ; If the realization of tooth movement is not supported, the limit of orthodontic means and tool support is used as the design limit, and it is as close as possible to the ideal orthodontic goal, and the minimum is to keep the original position.

Moreover, once the lateral positions of the mandibular canines and the mandibular first molars are determined, in step S130, the desired lateral arrangement after the current maxillary and maxillary dentition treatment can be determined based on the lateral positions of the mandibular canines and the mandibular first molars , that is, to determine the position of the remaining teeth in the lateral direction, that is, to obtain a target data set representing the target dentition layout. This step will be described below together with the front-to-back tooth arrangement method.

3. Determine the front and rear positioning of the row teeth

Moreover, according to a specific embodiment of the present invention, the target position includes an anterior-posterior target position, and in order to determine the anterior-posterior target position of the entire dentition, the mandibular central incisor (the tooth position number is 31 or 41) is selected. ) as key teeth to locate the anteroposterior depth of the entire dentition. Therefore, in the third specific embodiment, in step S120, it is necessary to use the obtained parameter set to determine the target position representing the target position of at least one key tooth that represents the desired anterior-posterior target position of the mandibular central incisor after orthodontic treatment. data set.

Among them, the mandibular central incisors include the mandibular central incisors whose tooth position number is 31 or 41 (ie, the left or right mandibular central incisors). Here, it is preferable that the anterior and posterior positions of the left and right mandibular central incisors are adjusted to be substantially consistent, and then the anterior and posterior positions of the entire dentition are determined according to the anterior and posterior positions of the left or right mandibular central incisors. . However, only the left mandibular central incisor can be used to determine the anteroposterior position of the entire dentition, or the right mandibular central incisor can be used to determine the anteroposterior position of the entire dentition, which is not limited in the present invention.

The general principle is: refer to the angle/position relationship between the mandibular central incisor and the alveolar bone in the lateral cephalogram to determine the ideal anterior-posterior position and angle of the mandibular central incisor.

Specifically, the ideal width position of the mandibular central incisor can be determined by any one or a combination of the following three methods.

Method 1: CT sagittal section of alveolar base bone.

The corresponding rule is: the ideal position is when the root of the long axis of the mandibular central incisor is located in the center of the base bone according to the CT sagittal section.

Method 2: WALA Ridge method.

The present invention proposes that the distance between the FA point of the mandibular central incisor and the WALA Ridge is set to 0-0.5mm, preferably 0.1mm.

Method 3: Cephalometric measurement of various angles and line distances.

For example, cephalometric angles include: IMPA, L1-NB, AP-L1, NP-L1, U1-L1, etc., while line distances include L1-NB(mm), AP-L1, NP-L1, etc.

For example, the measured mean of the IMPA (lower central incisor-mandibular plane angle) in normal Chinese was 93.9 degrees (standard deviation 6.2 degrees) according to Tweed analysis.

The average measurement of U1-L1 (the angle between the long axes of the upper and lower central incisors) in normal Chinese in the mixed dentition period was 122.0 degrees (standard deviation 6.0 degrees), while the average measurement of U1-L1 in the permanent dentition period was 125.4 degrees (standard deviation of 7.9 degrees)

For example, the L1-NB angle (the angle between the long axis of the lower central incisor and the line connecting the NB) and the line spacing (the vertical distance between the incisal edge of the lower central incisor and the line connecting the NB) in normal Chinese are 27 degrees. and 6mm, of which the NB line is the line connecting the nasion point and the lower alveolar seat point.

Among them, preferably, AP-L1 (upper central incisor convex distance) and NP-L1 (lower central incisor convex distance) line distance parameters can also be used. For these two parameters, there are two measurement methods: 1) the vertical distance from the incisal end of the upper and lower central incisors to the nasion point to the anterior chin point (face plane), respectively, 2) from the upper and lower central incisors, respectively The vertical distance from the incisal end of the incisor to the point of the superior alveolar base to the anterior point of the chin (AP plane).

Therefore, according to the third method, the anteroposterior position of the mandibular central incisor can be determined based on the above-mentioned measured cephalometric parameters and in combination with the above-mentioned dental statistical data.

In conclusion, the anteroposterior position of the mandibular central incisor can be determined according to any one of the above three methods or the comprehensive consideration of the three methods.

Finally, it also includes: adjustment according to the specific situation of the case: the position and angle of the lower incisors are adjusted according to the degree of convexity and retraction of the lower jaw and the relative position relationship between the lower jaw and the upper jaw (class I/class II/class III) according to facial aesthetics; and according to the treatment methods and the tools used are adjusted accordingly. The principle is: if the orthodontic means and tools support the realization of tooth movement, the design can be closer to the standard; if it does not support the realization of tooth movement, the design limit should be based on the limit supported by the orthodontic means and tools, and the ideal orthodontic goal should be approached as much as possible. to remain in place.

And, once the anteroposterior height of the mandibular central incisor is determined, in step S130, the remaining teeth are arranged correspondingly in the anteroposterior direction. In addition, in combination with the above-mentioned second specific embodiment, in step S130, the desired lateral arrangement of the current maxillary and maxillary dentitions after orthodontic treatment can be determined based on the lateral positions of the mandibular canines and mandibular first molars, that is, the remaining teeth can be determined. In the lateral position, a target dataset representing the target dentition layout is obtained.

The reference mark is the line of occlusion shown in FIG. 6 . The standard occlusal curve is the connection line formed by the contact points of the upper and lower teeth when the teeth of the upper and lower jaws are occluded. In order to determine the target positions of the remaining teeth except the above-mentioned key teeth, it is necessary to fit a target occlusal curve based on several key teeth, as follows:

A. First, determine the occlusal curve of the mandible: fit a curve to the positions of the mandibular central incisors, mandibular canines, and mandibular first molars; among them, the mandibular arrangement should satisfy the incisal margin of mandibular incisors, canine cusps, premolars and The molar buccal cusps should lie on this occlusal curve. In addition, the requirement that there is no gap or crowding in the dentition (or the gap and the crowding amount meet the set requirements) must be met.

Finally, after the incisal edge or cusp of each tooth satisfies the condition of being located on the occlusal curve, for the specific position of each mandibular tooth, the following requirements also need to be met: the torque and axial inclination angle of each tooth meet the standard values (as shown in the figure). 7B and 8B), and the tooth twist angle is small.

B. After the occlusal curve of the mandible is determined, the position of the maxillary teeth should meet: the upper dental arch uses the mirror image occlusal curve of the lower dental arch; the arrangement of the maxillary teeth should satisfy the lingual occlusion corresponding to the overburden of the maxillary incisors and canines. The belt is located on this occlusal curve, and the fovea of the premolars and molars is consistent with the occlusal curve; there is no gap or crowding in the dentition (or the gap and crowding amount meet the set requirements);

Finally, after the incisal edge or cusp of each tooth satisfies the condition of being located on the occlusal curve, for the specific position of each maxillary tooth, the following requirements also need to be met: the torque and axial inclination angle of each tooth meet the standard values (as shown in the figure). 7B and 8B), and the tooth torsion angle is based on the uniform coverage with the mandibular teeth and good cusp fitting.

For the occlusal relationship, the vertical relationship between the upper and lower dentition and the occlusal plane determines the vertical occlusal relationship of the upper and lower jaws; the positional relationship between the upper and lower dentition and the dental arch curve determines the anterior-posterior and lateral occlusion of the upper and lower jaws relation.

In the following, concepts such as torque, axial inclination and torsion angle of teeth will be briefly introduced.

Tooth torque: The angle formed by the tangent of the clinical crown of the tooth and the perpendicular to the occlusal plane is called torque. Figure 7A shows a schematic diagram of tooth torque values. Among them, as shown in the figure, A represents that the gingival end of the clinical crown tangent is a positive value behind the vertical line of the occlusal plane, whereas the tooth torque in B is a negative value.

For each tooth, the tooth torque has a reference normal value or normal range value. For example: FIG. 7B shows an example of normal values of tooth torque for certain teeth of the upper and lower jaws (wherein the units of the values contained in FIG. 7B are degrees). Therefore, the tooth torque can be set within the normal range according to the reference value to determine the specific position of each tooth.

Tooth axial inclination: the angle formed by the long axis of the clinical crown of the tooth and the vertical line of the occlusal plane is the axial inclination angle. When the gingival end of the long axis of the clinical crown is inclined distally, the axial inclination is positive, and when it is inclined mesially, the axial inclination is negative. The normal inclination of the axis is mostly positive.

Figure 8A shows a schematic diagram of tooth axis inclination values. Among them, as shown in the figure, the inclination of the tooth axis in A represents a positive value, whereas the inclination of the tooth axis in B is a negative value.

For each tooth, there is a reference normal value or normal range value for the inclination of the tooth axis. For example: FIG. 8B shows an example of normal values of the tooth axis inclination of certain teeth of the upper and lower jaws (wherein the units of the numerical values contained in FIG. 8B are degrees). Therefore, the inclination of the tooth axis can be set within the normal range according to the reference value to determine the specific position of each tooth.

Tooth torsion: Generally speaking, it refers to the angle formed by the tangent of the clinical dental arch of the tooth and the dental axis as the torsion angle. If the teeth are severely twisted, it will affect the aesthetics and is not conducive to the chewing function, so generally speaking, the twist angle of the teeth should be small.

And, adjust according to the specific situation of the case: adjust the orthodontic target according to the orthodontic means and the orthodontic limit contained in the tools used; the principle is: the orthodontic means and tools support the realization of tooth movement, then the design can be closer to the standard; do not support the tooth movement. The realization of the movement is based on the limit of the orthodontic means and tool support as the design limit, and it is as close as possible to the ideal orthodontic goal, and the minimum is to maintain the original position.

4. Also, it should be noted that although the above descriptions have respectively introduced the implementations of how to determine the vertical, transverse and anterior and posterior directions of the dentition, the present invention also includes the combination of these three implementations. A fourth embodiment of determining the position of the dentition in three dimensions.

In the fourth embodiment, in step S120, it is necessary to use the obtained parameter set to determine the desired vertical target position representing the maxillary first molar after orthodontic treatment, and the desired vertical target position of the mandibular canine and mandibular first molar after orthodontic treatment. A dataset representing the target position of at least one key tooth of the lateral target position, and the desired anteroposterior target position after treatment of the mandibular central incisor.

In addition, in step S130, based on the vertical height of the maxillary first molar, the desired lateral target position of the mandibular canine and mandibular first molar after orthodontic treatment, and the desired anterior-posterior target position of the mandibular central incisor after orthodontic treatment. A data set representing the target position of at least one key tooth, and a target data set representing the target dentition layout representing the desired vertical, lateral and anteroposterior positions of the current upper and lower dentition is determined.

5. Further, the present invention also includes the fifth, sixth, and the fifth, sixth, and the fifth, the sixth, and the third, which combine any two of the three embodiments for determining the vertical, lateral, or anteroposterior position respectively to determine the position in the two dimensions of the dentition. The seventh embodiment.

For example, in the fifth embodiment, in step S120, it is necessary to use the obtained parameter set to determine the desired vertical target position representing the maxillary first molar after orthodontic treatment, and the desired anterior-posterior position of the mandibular central incisor after orthodontic treatment. A dataset representing the target position of at least one key tooth towards the target position.

In addition, in step S130, a data set representing the target position of at least one key tooth may be determined based on the vertical height of the maxillary first molar and the target position of the mandibular central incisor expected to be obtained after orthodontic treatment. A target dataset representing the target dentition layout of the desired vertical and anteroposterior positions of the upper and lower dentition.

The sixth and seventh embodiments are also similar and will not be repeated here.

In addition, when determining the position of the entire dentition, preferably, the position of the joint should also be considered. As shown in Figure 9A, the condyle is located at the terminal end of the mandible, which determines the position of the mandible. Therefore, the following requirements should be considered when determining the position of the dentition: when the maxillary and maxillary teeth are in the contact position of the maximum canine fossa, the mandibular condyle should be located in the correct position of the joint fossa.

Specifically, the condyle is located in the uppermost and anterior position of the articular fossa (some scholars say it is located in the uppermost and last position of the articular fossa), facing the posterior oblique surface of the articular tubercle; and the anatomical study of the position of the condyle shows: For example, the mesial ridge should be located at the apex of the glenoid, which is the uppermost part of the glenoid, with the anteroposterior in the middle position and the horizontal in the middle position. And, the position of the mandible is adjusted so that the measurement data of the joint space satisfies the standard value (as shown in FIG. 9B ), or approximates the standard value.

Finally, aesthetics is an important reference index for orthodontic treatment and an important factor in determining the position of teeth. Therefore, after basically determining the position of the teeth according to the above rules, the central incisors, canines, and first molars can be properly adjusted in the vertical, lateral, and anterior-posterior directions according to the lip-facial aesthetics.

Furthermore, the present application also provides a system for implementing the above method. FIG. 10 shows a system 200 of the present application according to an exemplary embodiment. System 200 may be any form of digital platform, including desktop computers, notebooks, portable palmtop computers, digital platforms, computer clusters, network workstations, and the like.

The system 200 shown in FIG. 10 includes: one or more input components 210 interconnected by a bus 250; one or more output components 220; one or more central processing units (CPUs) 230; and one or more storage A component 240 that stores therein one or more computer programs 244 , one or more operating systems 246 , and optionally one or more databases 248 .

Among other things, input component 210 enables data input to be provided to system 200 . Commonly used input components 210 include data input interfaces, network transmission interfaces, or other types of input components. In the present application, the input component 210 is used to obtain a raw data set representing the original dentition layout and a parameter set representing the head structure, ie receiving, for example, a CT scanner using an intraoral scanner or based on an impression or partial impression of the patient's teeth The collected electronic images of the patient's teeth at the initial position, and X-ray cephalometric raw data or data processed by specific cephalometric software.

In addition, the output component 220 is used to provide calculation results to the user. Common output components 220 include a user graphical interface (GUI), a three-dimensional display interface, an output data interface, a network transmission interface, or other types of output components. For example, the computer system is programmed to provide a graphical user interface (GUI) and a three-dimensional display interface to facilitate the user to set parameters and determine the optimal target dentition position through the computer system.

A central processing unit (CPU) 230 generally controls the overall operation of system 280, such as operations associated with display, data processing, data storage, data communication, and recording operations, and the like. Central processing unit (CPU) 230 may include one or more processors to execute instructions to perform all or part of the steps of the above-described methods. Additionally, the central processing unit (CPU) 230 may include one or more modules that facilitate handling interactions between the central processing unit (CPU) 230 and other components. For example, central processing unit (CPU) 230 may include an input/output module to facilitate interaction between input component 210 , output component 220 , and central processing unit (CPU) 230 .

Memory 240 may be implemented by any type of random access memory device RAM 241 or read only memory device ROM 242, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), CD-ROMs, magnetic tapes, floppy disks, and optical data storage devices, among others. Memory 240 may be configured to store various types of data to support operations at system 200 . Examples of such data include any operating system 246 , computer program 244 , database 248 , etc. used to operate on system 200 . The computer program 244 can be executed in the system 200, and the computer program 244 instructs corresponding modules of the central processing unit 230 to execute the method described in this application through instructions. Also, in the present invention, the memory 240 is further configured to store a raw data set representing the original dentition layout and a parameter set representing the head structure.

Wherein, the method shown in FIG. 1 can be implemented in a computer-readable medium by, for example, computer software, hardware or a combination thereof. For hardware implementation, the embodiments described herein may be implemented by application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGA), processor, controller, microcontroller, microprocessor, other electronic unit designed to perform the functions described herein, or one or more of a selective combination thereof.

For software implementation, the embodiments described herein may be implemented with separate software modules, such as process modules and functional modules, each of which performs one or more of the functions and operations described herein. The software codes can be implemented in a software application written in any suitable programming language, and can be stored in the memory or other computer-readable medium of a dedicated computer system and executed by the processor of the computer system, or installed on a computer with data In other electronic devices that store and process functions, such as tablets, servers, etc.

Therefore, the system 200 may be configured to implement any step and any combination of steps of the methods described and included in this application, and will not be repeated here.

Also, for the sake of brevity, conventional data networking, application development, and other functional aspects of the system (each of the individual operating components within the system) are not described in detail here. Furthermore, the connecting lines shown in the accompanying figures are intended to represent typical functional relationships and/or physical connections between the various elements. It should be noted that many transformations and/or additional functional relationships or physical connections may exist in an actual system.

Further, those skilled in the art will appreciate that any computing device used by a user may include not only various conventional support software and drivers commonly associated with computers, but also operating systems (eg, Windows, OS2, UNIX, Linux, Solaris, etc.) , MacOS, etc.). Those of ordinary skill in the art will appreciate that each computing device may be embodied as a customized existing system, add-on product, upgraded software, stand-alone system, distributed system, method, data processing system, Apparatus and/or computer program product for data processing. Thus, any program stored herein may take the form of an entirely software embodiment, an entirely hardware embodiment, or an embodiment that is a combination of both software and hardware. Furthermore, any program may take the form of a computer program product on a computer-readable storage medium having computer-readable program code means embedded in the storage medium. Any suitable computer-readable storage medium may be employed, including: hard disks, CD-ROMs, optical storage devices, magnetic storage devices, and the like.

While various aspects and embodiments of the invention have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration only and not limitation. The scope and spirit of the present invention are to be determined only by the appended claims.

Likewise, the various diagrams may illustrate exemplary architectural or other configurations of the disclosed methods and systems, which may be helpful in understanding the features and functionality that may be included in the disclosed methods and systems. The claimed invention is not limited to the exemplary architectures or configurations shown, but the desired features may be implemented in various alternative architectures and configurations. Additionally, with respect to the flowcharts, functional descriptions, and method claims, the order of blocks presented herein should not be limited to various embodiments that are implemented in the same order to perform the functions, unless the context clearly dictates otherwise. .

Unless expressly stated otherwise, the terms and phrases used herein, and variations thereof, are to be construed as open-ended rather than restrictive. In some instances, the appearance of expanding words and phrases such as "one or more," "at least," "but not limited to," or other similar expressions should not be construed as in instances where such expanding words may not be present Intent or need to indicate a narrowed situation.

Claims (23)

1. A method for determining a target dentition layout, comprising the steps of: receiving a raw data set representing the original dentition layout, the raw data set including a data set representing the original positions of a plurality of key teeth including the mandibular canines, first molars, central incisors, and maxilla the first molars and central incisors; Get the parameter set representing the head structure; using the parameter set of the head structure, determining a data set representing target positions of the plurality of key teeth based on the data set representing the original positions of the plurality of key teeth; and generating a target data set representing a target dentition layout according to the data set representing target positions of the plurality of key teeth; Wherein, generating the target data set representing the target dentition layout according to the data set representing the target positions of the plurality of key teeth includes: According to the data representing the vertical target positions of the maxillary first molars and the maxillary central incisors, using the occlusal plane formed by the maxillary first molars and the maxillary central incisors, the vertical target positions representing the maxillary dentition are determined The data; Based on the data representing the lateral target positions of the mandibular canines and mandibular first molars, using the mandibular occlusal curve fitted by the mandibular canines and mandibular first molars and mandibular central incisors, the representative mandibular dentition is determined. data on the lateral target position; Based on the data representing the anteroposterior target positions of the mandibular central incisors, the anteroposterior target representing the mandibular dentition is determined using the mandibular occlusal curve fitted by the mandibular canines, mandibular first molars and mandibular central incisors location data. 2. The method of claim 1, wherein the raw data set comprises a representative maxillary raw dentition layout and a mandibular raw dentition layout. 3. The method of claim 1, wherein the parameter set representing the head structure comprises at least one of a cephalometric parameter measurement data set, a dental image measurement data set, and a dental parameter standard value set. 4. The method of claim 1, wherein when the maxillary first molar is pathologically elongated, the plurality of key teeth comprises a maxillary first premolar or a maxillary second premolar, and the The dataset representing the target positions of multiple key teeth includes the vertical target positions of the maxillary first premolar or the maxillary second premolar. 5. The method of claim 1, wherein the parameter set representing the head structure comprises a cephalometric parameter measurement data set and a standard value set of the corresponding cephalometric parameter, the method further comprising: by comparing the The measured data of the cephalometric parameters and the standard values of the corresponding cephalometric parameters are used to determine the vertical target position of the maxillary first molar. 6. The method of claim 5, wherein the cephalometric parameters include the intersection angle between the eye-ear plane and the mandibular plane (FMA), the intersection angle between the anterior skull base plane and the mandibular plane (SN-MP), and the posterior- At least one of the front high ratios (S-Go/N-Me). 7. The method of claim 1, wherein the target data set further comprises data representing a vertical target position of the mandibular dentition, the method further comprising: according to the vertical direction representing the maxillary dentition For the data of the target position, the data representing the vertical target position of the mandibular dentition is determined by using the overbite coverage or occlusal relationship between the maxillary teeth and the corresponding mandibular teeth. 8. The method of claim 1, wherein the set of parameters representing head structure comprises a lateral position measurement data set and a reference data set of the mandibular canines and mandibular first molars, the method further The method includes: determining the lateral target positions of the mandibular canines and mandibular first molars based on the lateral position measurement data set and the reference data set of the mandibular canines and mandibular first molars. 9. The method of claim 8, wherein the lateral position measurement data set and the reference data set of the mandibular canines and mandibular first molars comprise any one of the following data sets: based on alveolar bone CT Image-determined dataset representing the relationship between the lateral position of the mandibular canine and mandibular first molar and the position of the alveolar base, representing the position of the WALA ridge of the mandibular dentition and the FA point of the mandibular canine and mandibular first molar A relational dataset, and a dataset and a normative value set representing lateral position measurements of the mandibular canines and mandibular first molars. 10. The method of claim 1, wherein the target data set further comprises data representing a lateral target position of a maxillary dentition, the method further comprising: obtaining a mirrored maxillary bite from the mandibular bite curve Curve, determine the data representing the lateral target position of the maxillary dentition. 11. The method of claim 1, wherein the set of parameters representing head structure comprises an anterior-posterior position measurement data set and a reference data set of the mandibular central incisor, the method further comprising: based on The anterior-posterior position measurement data set and the reference data set of the mandibular central incisor determine the anterior-posterior target position of the mandibular central incisor. 12. The method of claim 11, wherein the anterior-posterior position measurement data set and the reference data set of the mandibular central incisor comprise any one of the following data sets: determined according to a CT image of alveolar base bone A dataset representing the relationship between the anteroposterior position of the mandibular central incisor and the position of the alveolar base, a dataset representing the positional relationship between the WALA ridge of the mandibular dentition and the FA point of the mandibular central incisor, and cephalometric parameter measurements A dataset and a set of standard values for the corresponding cephalometric parameters. 13. The method of claim 12, wherein the cephalometric parameters include lower central incisor-mandibular plane angle (IMPA), the angle between the long axes of the upper and lower central incisors (U1-L1), the lower central incisor The included angle between the long axis of the incisor and the line connecting NB (L1-NB angle), the vertical distance between the incisal edge of the lower central incisor and the line connecting NB (L1-NB line distance), the convex distance of the upper central incisor (AP-L1) And at least one of the lower central incisor convex distance (NP-L1), wherein the NB connection line is the connection line between the nasion point and the lower alveolar seat point. 14. The method of claim 1, wherein the target data set further comprises data representing anterior-posterior target positions of the maxillary dentition, the method further comprising: obtaining a mirrored maxillary based on the mandibular occlusal curve An occlusal curve is determined from the data representing the anteroposterior target position of the maxillary dentition. 15. The method of claim 1, wherein the method further comprises: determining the anteroposterior and lateral target positions of each tooth of the maxillary dentition according to the mandibular occlusal curve; generating a mirrored maxillary occlusal curve based on the mandibular occlusal curve; and Anterior-posterior and lateral target positions for each tooth of the maxillary dentition are determined. 16. The method of claim 15, wherein the method further comprises: adjusting the target position of each tooth of the mandibular dentition, so that the torque, the axial inclination angle of each tooth of the mandibular dentition It needs to be equal to or substantially equal to the standard value, and the twist angle of each tooth is not greater than a certain threshold. 17. The method of claim 16, wherein the method further comprises: adjusting the target position of each tooth of the maxillary dentition, so that the torque, the axial inclination angle of each tooth of the maxillary dentition It should be equal to or substantially equal to the standard value, and the twist angle of each tooth should be uniformly covered with the corresponding mandibular teeth, and the cusps fit well. 18. The method according to any one of claims 1 to 17, wherein the method further comprises: moving the position of the upper and lower jaw dentition as a whole according to the joint parameters, so as to obtain a target data set reflecting the joint parameters . 19. The method of claim 18, wherein the overall movement comprises: adjusting the vertical, lateral, and anterior-posterior target positions of the upper and lower dentition so that when the upper and lower dentition touches the maximal fossa In the relative position, the measured data of the position of the mandibular condyle in the joint socket are equal to or approximate to the standard value. 20. The method of any one of claims 1 to 17, wherein the method further comprises: adjusting the upper and lower central incisors, canines and first molars based on lip-facial aesthetic indicators, to obtain a target dataset that reflects aesthetic metrics. 21. The method according to any one of claims 1 to 17, wherein the method further comprises: adjusting the target data set according to the correction means and correction limits corresponding to the correction tools. 22. The method of any one of claims 1 to 17, wherein the method is implemented by a computer. 23. A system for determining a target dentition layout, comprising: an input unit for receiving a raw data set representing the original dentition layout and acquiring a parameter set representing the head structure, the raw data set including a data set representing the original positions of a plurality of key teeth, the plurality of key teeth Including mandibular canines, first molars, central incisors and maxillary first molars and central incisors; A controller that performs the following steps: using the set of parameters for the head structure, determining a data set representing target locations for the plurality of key teeth based on the data set representing the original positions of the plurality of key teeth; and generating a target data set representing the target dentition layout according to the data set representing the target positions of the plurality of key teeth; Wherein, generating the target data set representing the target dentition layout according to the data set representing the target positions of the plurality of key teeth includes: According to the data representing the vertical target positions of the maxillary first molars and the maxillary central incisors, using the occlusal plane formed by the maxillary first molars and the maxillary central incisors, the vertical target positions representing the maxillary dentition are determined The data; Based on the data representing the lateral target positions of the mandibular canines and mandibular first molars, using the mandibular occlusal curve fitted by the mandibular canines and mandibular first molars and mandibular central incisors, the representative mandibular dentition is determined. data on the lateral target position; Based on the data representing the anteroposterior target positions of the mandibular central incisors, the anteroposterior target representing the mandibular dentition is determined using the mandibular occlusal curve fitted by the mandibular canines and mandibular first molars and mandibular central incisors location data.

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