KR20130008236A - Image matching data creation method for orthognathic surgery and method for the orthognathic simulation surgery using the same - Google Patents

Abstract

The present invention relates to a method for generating image matching information for orthodontics and an orthodontic simulation method using the same. More particularly, in performing orthodontic surgery of a target patient, the orthodontic surgery is performed by allowing accurate occlusion of the maxilla and the mandible. It is intended to greatly improve the accuracy of the.
To this end, the present invention eliminates the phase (noise) generated in CT (computed tomography) images, and improves the accuracy of the upper and lower teeth by using three-dimensional scan data of the teeth, and the image information By using this, accurate orthodontic simulation that reflects occlusal information can be performed.
In particular, by analyzing and processing the CT image and scan data in conjunction with each other, by matching the coordinates by distinguishing the anatomical parts, it provides accurate occlusion information for the facial bone of the target patient as well as performing accurate and efficient orthodontic simulation It works.
Therefore, there is an effect of improving the reliability and safety of the patient for the surgery in the orthognathic surgery.

Description

Image matching data creation method for orthognathic surgery and method for the orthognathic simulation surgery using the same}

The present invention relates to a method for generating image matching information for orthodontics and an orthodontic simulation method using the same. More specifically, in performing orthodontic surgery of a target patient, the orthodontic surgery is performed by allowing accurate occlusion of the maxilla and the mandible. It is intended to greatly improve the accuracy of the.

To this end, the present invention eliminates the phase (noise) generated in CT (computed tomography) images, and improves the accuracy of the upper and lower teeth by using three-dimensional scan data of the teeth, and the image information The present invention relates to a method of generating image matching information for orthodontics and an orthodontic simulation method using the same to enable accurate orthodontic simulation to reflect occlusal information.

In general, the abnormality of the upper and lower teeth occlusion is called malocclusion because the teeth are not right, and such malocclusion not only causes aesthetic problems on the face but also physical problems such as pronunciation problems such as tooth decay and gum disease. Health problems can also occur. In particular, a case with facial deformities such as the mandible and the maxilla is called skeletal malocclusion.

Therefore, surgery to make such skeletal malocclusion normal occlusion is required, and such surgery is called orthognathic surgery.

In the case of orthognathic surgery, the fusion information of the tooth and the two parts of the patient is required. In this case, when a corrective device or a prosthesis is present on the tooth, a CT image of the tooth part includes a phase (noise) such as an afterimage or a virtual image, and it is difficult to reproduce the accurate shape of the tooth due to the phase.

In order to solve this problem, it is necessary to accurately reproduce the tooth part in the CT image or to superimpose or replace the tooth part of the CT image by 3D scanning the plaster model of the tooth. In this case, in order to accurately position the 3D scan image on the already distorted CT image according to the actual state of the patient, the image is corrected to match the actual anatomical information as well as the deformation using the simple correction of the distorted CT image. There is a demand for a method of obtaining information of a part having a small error for each and positioning a scanned image on a CT image based on the information.

In addition, while preserving CT images other than distorted image information of teeth, accurate reproduction and verification of mock surgery for reproducing measurements and actual surgery is required, and the manufacture of surgical devices to be implemented during actual surgery Is required.

On the other hand, in the method of superimposing the entire volume center used in the medical software, when devices such as orthodontics and gingiva installed on the target patient's teeth are applied and appear, an error occurs in the superimposition of the hard tissue based on the teeth and bones.

In addition, the scan data superimposition method used in CAD / CAM software can not only correct the distorted CT image when attempting to superimpose it in CAD / CAM, but also corrects the distorted image by viewing the CT cross-sectional image as in the medical program. Have a problem that is difficult to do

In order to solve the above problems and satisfy the above requirements, the present invention removes phases (noise) such as afterimages or virtual images on CT images, and image matching information for orthodontics to reproduce accurate shapes of teeth. It is an object of the present invention to provide a method for generating and orthodontic simulation using the same.

To this end, the present invention utilizes the functions of medical software (program) and specialized functions of CAD / CAM software (design application program). It is an object of the present invention to provide an image matching information generation method for orthodontics that can be made by software information (image information), and an orthodontic simulation method using the same.

In addition, an object of the present invention is to provide a method of generating image matching information for orthodontic correction and the orthodontic simulation method using the same that can be accurately corrected facial bone using the CT image and the scan data of the three-dimensional scanning of the plaster model of the tooth There is this.

In particular, by performing the orthodontic simulation operation using the image matching information for orthodontics provided by the present invention, to establish an effective surgical plan, as well as to match the image for orthodontics to produce a device for orthodontic surgery accordingly It is an object of the present invention to provide a method of generating information and orthodontic simulation using the same.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention by those skilled in the art.

In order to achieve the above object, the image matching information generation method for orthodontics according to the present invention, the noise of the CT image of the facial bones of the target patient is removed, and the anatomical part is divided and restored into an image file Making; Analyzing and correcting the scan data obtained by three-dimensional scanning the dental model of the target patient in an occlusal state; Calling the converted image file to set an important part of a dental occlusal surface of a target patient; Matching the scan data with an image coordinate system of the image file based on the important portion of the occlusal surface and overlapping the corrected scan data on the converted image file; And removing the dental image of the image file and combining the dental image of the scan data to obtain a three-dimensional image of the facial bone of the target patient.

In addition, the orthodontic simulation method using the image matching information for orthodontics according to the present invention, a) converting the CT image of the facial bone of the target patient to generate an image file, and remove the tooth image of the generated image file And combining the dental images of the scan data obtained by three-dimensional scanning of the target patient's dental model with a predetermined occlusal state to obtain a three-dimensional image of the facial bone of the target patient; b) a first simulation of calling the obtained dental image and moving the mandible of the image file in accordance with the image file of the lower teeth in the position where the upper and lower teeth are occluded to the upper jaw of the image file based on the occlusal state; Performing surgery; And c) determining whether additional surgery is performed in a state where the maxilla and mandible are occluded, and performing a second simulation operation for additional surgery according to the determination.

In one embodiment, step b) comprises the steps of b-1) invoking the scan data of the teeth for the maxillary and mandibular teeth of the occlusal state; b-2) moving the called maxillary and mandibular dental scan data based on a CT image; b-3) overlapping the scan data of the teeth on the image file by matching the CT image coordinate system with that of the medical program; And b-4) moving the lower jaw of the image file based on the position of the scan data of the tooth at a predetermined occlusal position.

In an embodiment, the step c) may include: c-1) collecting and storing measurement information about measurement items set under the control of a doctor in the first simulated surgery state; c-2) analyzing the collected measurement information and determining whether to perform further surgery under the control of a doctor; c-3) if further surgery is determined, applying the determined additional surgery while maintaining the maxillary and mandibular occlusion of the subject patient; And c-4) performing simulated surgery under the control of a doctor while monitoring the measured information changed in the process of applying the additional surgery in real time.

In one embodiment, orthodontic simulation method using the image matching information for orthodontics, d) obtains the surgical data according to the result of the second simulation surgery, and based on the obtained surgical data to operate the surgical device The method may further include providing data for production.

By means of the above solution, the present invention can analyze and process the CT image and the scan data in conjunction with each other, by matching the coordinates by distinguishing the anatomical parts, to provide accurate occlusal information for the joint of the target patient There is this.

In particular, the present invention fuses the functions of medical software (program) and the specialized functions of CAD / CAM software (design application program) into one, thereby making it possible to perform accurate and efficient simulation of orthodontics.

Therefore, there is an advantage to establish an efficient surgical plan for the actual orthognathic surgery.

In addition, the present invention has the effect of providing the ease and accuracy and precision of manufacturing for the surgical device used in orthognathic surgery, based on the surgical plan and occlusal information provided.

Therefore, there is an effect of improving the reliability and safety of the patient for the surgery in the orthognathic surgery.

1 is a flowchart illustrating an embodiment of a method for generating image matching information for calibration in accordance with the present invention.
FIG. 2 is a flowchart for explaining a specific embodiment of step S100 of FIG. 1.
FIG. 3 is a flowchart for describing a specific embodiment of step S200 of FIG. 1.
FIG. 4 is a flowchart for describing a specific embodiment of step S300 of FIG. 1.

An example of an image matching information generation method and an orthodontic simulation method using the same according to the present invention can be variously applied. Hereinafter, the most preferred embodiment will be described with reference to the accompanying drawings.

Hereinafter, in describing the present invention, the medical program may include software for analyzing and processing a computed tomography (CT) image to perform simulation and the like, and the design application may include computer aided design. , Computer aided design) or computer aided manufacturing (CAM) software. In addition, the medical program and the file processed in the CAD / CAM program may include files provided in the form of stereolithography (STL).

The configuration and specific data processing method of the present invention including the CT photographing device and the CAD / CAM program execution device can be variously modified according to the needs of those skilled in the art. In the present invention, for the sake of convenience of explanation, the subject performing the data analysis and processing can be described by a program, but the present invention is not limited to this, and can be understood as being mainly explained with an apparatus that executes the program.

1 is a flowchart illustrating an embodiment of a method for generating image matching information for calibration in accordance with the present invention.

Referring to FIG. 1, a CT image of a facial bone of a target patient is converted to generate an image file, a dental image of the generated image file is removed, and a three-dimensional scan of the target patient's tooth model with a predetermined occlusal state during surgery. By combining the dental image of the acquired scan data, to obtain a three-dimensional image of the facial bone of the target patient (step S100). In an embodiment, the generation of the image file from which the dental image is removed and the scanning data acquisition of the dental image may be performed by dividing the upper and lower jaw of the target patient, respectively. For example, the image obtained from the CT image and the scan data may be divided into a plurality of parts based on an anatomical meaning.

The CAD / CAM program calls the acquired dental image and performs the first simulation operation of moving the lower jaw of the image file to the occlusal lower teeth of the image file based on the occlusal state of the upper and lower dental images (step S200). ). In one embodiment, the first simulated surgery may be performed under the control of a physician. For example, the first simulated surgery may be performed according to a surgical plan determined by the physician. In addition, the movement of the lower jaw can always be applied regardless of whether the movement of the maxilla.

The medical program determines whether additional surgery is performed in the state where the maxilla and the mandible are occluded under the control of the corresponding doctor, and performs the second simulation operation for the additional surgery according to the decision (step S300). In one embodiment, additional surgery may be determined according to the normal status of the facial bone, such as the maxilla and mandible, at the discretion of the doctor. For example, with the maxillary and mandibular occlusions, if the asymmetry, aesthetic and functional criteria of the facial bones do not match, further simulations may be performed to match them.

The CAD / CAM program may acquire the surgical data according to the result of the second simulation surgery, and extract and provide data for manufacturing the surgical device based on the obtained surgical data (step S400).

In an embodiment, step S400 may include: a first process of extracting the maxillary tooth scan data and the mandibular tooth scan data from the simulated surgical position after completion of the simulation operation; A second step of importing the extracted maxillary tooth scan data and the mandibular tooth scan data into a CAD / CAM program; A third step of thickening the called-up scan data to 0.05 mm to 0.3 mm (spaced distance) toward the occlusal surface area of the tooth; A fourth process of designing a device in the form of a mouthpiece including scan data of the deformed upper and lower teeth and generating surgical device data in which a corresponding tooth is bitten using the deformed scan data; A fifth process of molding the surgical device using materials that are medically acceptable and capable of accurately reproducing a dental part according to the surgical device data generated through an output device including a three-dimensional printer; And a sixth process of confirming that the manufactured surgical device is accurately engaged within the dental gypsum model of the patient and within the allowable spaced distance (0.05 mm to 0.3 mm). Here, the first to sixth process may be changed depending on the orthognathic surgery plan and the characteristics of the surgical device accordingly.

FIG. 2 is a flowchart for explaining a specific embodiment of step S100 of FIG. 1.

Referring to Figure 2, the medical program removes the noise of the CT image of the facial bones of the target patient, and converts the anatomical portion into an image file (step S110). For example, the noise may include an afterimage or a virtual image of a corresponding tooth part. In one embodiment, the anatomical classification is the coronal plane (Frontal plane, imaginary plane divided into the front and rear of the human body), the sagittal plane (virtual plane divided into the left and right sides of the human body) and the horizontal plane (Transverse plane) of the CT image Virtual plane divided by up and down). In addition, the converted image file may include an STL file.

The CAD / CAM program analyzes and corrects the scan data obtained by three-dimensionally scanning the dental model of the target patient with a predetermined occlusal state during surgery (step S120). In one embodiment, the correction may be performed to match the part determined to be the same as the oral state of the patient actually to remove the error generated in the CT image.

The CAD / CAM program may call the converted image file to set an important part of the occlusal surface of the target patient (step S130). In one embodiment, the CAD / CAM program may set the called image file as reference data.

The CAD / CAM program matches the scan coordinates with the image coordinate system of the image file based on the important portion of the occlusal surface, and overlaps the corrected scan data on the converted image file (step S140). In one embodiment, the CAD / CAM program may match the image coordinate system of the scan data with the coordinate system of the CT image based on the area of the occlusal surface portion set in the CT image.

The CAD / CAM program removes the dental image of the image file and combines it with the dental image of the scan data to obtain a three-dimensional image of the facial bone of the target patient (step S150). In one embodiment, the CAD / CAM program may extract the tooth scan data in an overlapped state, recall the corresponding part from the medical program, and remove the tooth part of the image file based on the scan data.

Such steps 'S130' to 'S150' may be performed on the maxilla and mandible of the target patient, respectively.

FIG. 3 is a flowchart for describing a specific embodiment of step S200 of FIG. 1.

Referring to FIG. 3, the CAD / CAM program may call the scan data of the teeth for the maxillary and mandibular teeth of the occlusal state (step S210). For example, the occlusal state may include the occlusal state of the maxilla and the mandible, which are positioned in a predetermined state after surgery according to the surgery plan of the corresponding doctor.

The CAD / CAM program may move the scan data of the maxillary and mandible teeth based on the CT image (step S220). In one embodiment, the mandibular tooth scan data may be moved based on the maxillary tooth scan data.

The CAD / CAM program allows the CT image coordinate system and the medical system coordinate system to coincide with each other, thereby overlapping the scan data of the teeth on the image file (step S230).

The CAD / CAM program can move the mandible of the image file based on the scan data position of the tooth (step S240). In one embodiment, the CAD / CAM program may call back and move the mandible image file from the medical software if the mandible dental scan data is set to a new standard.

Therefore, the CAD / CAM program moves the mandible tooth scan data to the maxillary tooth scan data, and then moves the mandible image file to the moved mandible tooth scan data, thereby prescribing the dental occlusal state to fit the target patient's maxilla. The mandibular first movement can be performed by moving the mandible.

In other words, by extracting an area (or correcting the area so that an error does not occur) of the CT image and the scan data, and sequentially moving the bite, the accurate simulation can be performed.

In another embodiment, the first simulated surgery extracts the occlusal contact point through the maxillary and mandible gypsum models of the postoperative occlusion on the CAD / CAM program, sets the occlusal points extracted from the medical program, and sets the maxillary The occlusal contact point of the mandible and the occlusal contact point of the mandible can be performed through the process of moving the mandible.

In the above, the movement of each anatomical part may be performed through a CAD / CAM program, and in the following further surgery after occlusion may be performed through a medical program.

FIG. 4 is a flowchart for describing a specific embodiment of step S300 of FIG. 1.

Referring to FIG. 4, the medical program may collect and store measurement information about measurement items set under the control of a doctor in the first simulated operation (step S310). For example, the measurement item may include at least one of a reference plane, a baseline, and a reference point associated with the current mandibular image of the patient and the cranial facial area. In addition, the measurement information may include at least one of a measurement angle and an error distance with respect to the reference of the corresponding measurement item.

The medical program may analyze the collected measurement information and determine whether additional surgery is under the control of the doctor (step S320). In one embodiment, the medical program may determine whether surgery for the maxilla is performed after orthodontic surgery by movement of the mandible.

The medical program may apply the additional surgery determined under the control of the doctor while maintaining the maxillary and mandibular occlusal state of the target patient when the additional surgery is determined (step S330).

The medical program may perform the simulation operation under the doctor's control while monitoring the measurement information changed in the process of applying the additional surgery in real time (step S340).

In the above, the method of generating image matching information for orthodontics and the orthodontic simulation method using the same have been described. It will be understood by those skilled in the art that the technical features of the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and therefore the meaning of the claims. And all changes or modifications derived from the scope and equivalent concept thereof should be construed as being included in the scope of the present invention.

Claims (5)

Removing noise of the CT image of the facial bone of the target patient, distinguishing and restoring an anatomical part, and converting the image into an image file;
Analyzing and correcting the scan data obtained by three-dimensional scanning the dental model of the target patient in an occlusal state;
Calling the converted image file to set an important part of a dental occlusal surface of a target patient;
Matching the scan data with the image coordinate system of the image file based on the important portion of the occlusal surface, and overlapping the corrected scan data on the converted image file; And
Removing the dental image of the image file and combining the dental image of the scan data to obtain a three-dimensional image of the facial bone of the target patient.
a) scan image obtained by converting the CT image of the facial bone of the target patient to generate an image file, removing the dental image of the generated image file, and three-dimensionally scanning the target patient's dental model with a predetermined occlusal state Combining a dental image of the patient to obtain a three-dimensional image of the facial bone of the target patient;
b) a first simulation of calling the obtained dental image and moving the mandible of the image file in accordance with the image file of the lower teeth in the position where the upper and lower teeth are occluded to the upper jaw of the image file based on the occlusal state; Performing surgery; And
c) orthodontic simulation using the image matching information for orthodontics, including determining whether additional surgery is performed in a state where the maxilla and mandible are occluded, and performing a second simulation operation for additional surgery according to the determination Way.
The method of claim 2,
The step b)
b-1) calling the scan data of the teeth for the maxillary and mandibular occlusions;
b-2) moving the called maxillary and mandibular dental scan data based on a CT image;
b-3) overlapping the scan data of the tooth on the image file by matching the CT image coordinate system with that of the medical program; And
b-4) orthodontic simulation using the image matching information for orthodontics, comprising the step of moving the lower jaw of the image file based on the position of the scan data of the tooth at a predetermined occlusal position.
The method of claim 3,
The step c)
c-1) collecting and storing measurement information about measurement items set under the control of a doctor in the first simulated surgery state;
c-2) analyzing the collected measurement information and determining whether to perform further surgery under the control of a doctor;
c-3) if further surgery is determined, applying the determined additional surgery while maintaining a predetermined occlusion of the maxilla and mandible of the subject patient; And
c-4) orthodontic simulation using the image matching information for orthodontics, comprising performing a simulation operation under the doctor's control while monitoring the measurement information changes in the process of applying the additional surgery in real time.
The method according to any one of claims 2 to 4,
Orthodontic simulation method using the image matching information for orthodontics,
d) acquiring surgical data according to the result of the second simulation operation, and providing data for manufacturing a surgical device based on the obtained surgical data. Orthodontic simulation using matching information.

Images