CN116807645A - Occlusion induction appliance and design and manufacturing methods thereof - Google Patents
Occlusion induction appliance and design and manufacturing methods thereof Download PDFInfo
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- A—HUMAN NECESSITIES
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- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/06—Extra-oral force transmitting means, i.e. means worn externally of the mouth and placing a member in the mouth under tension
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/002—Orthodontic computer assisted systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/08—Mouthpiece-type retainers or positioners, e.g. for both the lower and upper arch
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Abstract
The application belongs to the technical field of orthodontic treatment and discloses an occlusion induction appliance and a design and manufacturing method thereof, wherein an initial dental digital model and a jaw plane inclination angle of an acquirer are used for determining an anterior dental guide area, a first dental model is formed by establishing a dental model of unerupted anterior teeth in the initial dental digital model, the position and the inclination angle of the dental model in the anterior dental guide area are adjusted, a guide rail model is generated in the first dental model based on the adjusted dental model of the anterior dental guide area so as to be combined with the first dental model to form a second dental model, a preliminary occlusion induction appliance digital model is generated according to the second dental model, and the jaw pad thickness and the guide rail groove depth of the preliminary occlusion induction appliance digital model are adjusted according to the jaw plane inclination angle to obtain a final occlusion induction appliance digital model; thereby being capable of obtaining personalized occlusion induction correction of the patient to effectively improve the situation that the inclination angles of anterior teeth, anterior teeth contra-jaw and jaw plane are overlarge.
Description
Technical Field
The application relates to the technical field of orthodontic treatment, in particular to an occlusion induction appliance and a design and manufacturing method thereof.
Background
In the growth and development process of children, malformations (abbreviated as malocclusion, also called abnormal tooth surface) such as uneven tooth arrangement, inconsistent tooth and bone relation and the like are sometimes caused by congenital genetic factors, acquired bad life habits and the like, wherein the conditions of anterior teeth such as bucktooth, anterior teeth contra-jaw and excessive jaw plane inclination angle are particularly easy to occur, so that the beauty is influenced, and diseases such as decayed teeth, periodontal disease, temporomandibular arthropathy and the like are caused. Therefore, it is necessary to perform orthodontic treatment on teeth with malocclusions to overcome the problems of anterior backbones, anterior inverse mandibles, and excessive angles of jaw plane inclination.
The occlusion induction appliance is an oral muscle function trainer designed based on OMT therapy (Oral Myofunctional Therapy, oral muscle function therapy). The treatment principle of the innovative medical device is that the occlusion relationship is readjusted to achieve the normal maxillofacial development by stimulating the temporal-mandibular joint development of the children patients, and the positions of dentition and the arch state of teeth are adjusted by using gentle force in multiple directions.
Children are usually in the period of replacing anterior teeth at 6-8 years old, and anterior teeth do not erupt at this time, and the existing silica gel orthodontic tooth cover can not be adjusted according to the condition that patient's anterior teeth do not erupt, so that deformity which is appeared or will appear on anterior teeth can not be effectively corrected, and the method specifically comprises the following limitations:
1. when the depth of the upper jaw and the lower jaw is covered by more than 4mm during anterior tooth bucktooth, the anterior tooth is difficult to enter the tooth socket;
2. when the individual front teeth are in inverse jaw, the shape of the front tooth socket is not matched with that of the inverse jaw teeth, and the wearer cannot wear the teeth;
3. the anterior socket is unable to apply an orthodontic force to the tooth orientation.
Accordingly, there is a need for improvement and advancement in the art.
Disclosure of Invention
The application aims to provide an occlusion induction appliance and a design and manufacturing method thereof, which can obtain personalized occlusion induction appliance aiming at the growth condition of anterior teeth of patients so as to effectively improve the situation that the inclination angles of anterior teeth and anterior teeth are overlarge.
In a first aspect, the present application provides a method of designing an occlusion-inducing appliance for a patient having at least one unerupted anterior tooth, comprising the steps of:
A1. acquiring an initial dental digital model and a jaw plane inclination angle of a person, and determining an anterior tooth guiding area;
A2. establishing a tooth model of unexplored front teeth in the initial tooth jaw digital model to form a first tooth jaw model;
A3. adjusting the position and inclination angle of the tooth model in the anterior tooth guiding region in the first dental model;
A4. generating a guide rail model in the first dental model based on the adjusted dental model of the front dental guide region, and combining the guide rail model with the first dental model to form a second dental model;
A5. generating a preliminary occlusion induction appliance digital model according to the second dental model; the occlusion induction appliance digital model comprises a guide rail groove matched with the guide rail model;
A6. and adjusting the jaw pad thickness and the guide rail groove depth of the primary occlusion induction appliance digital model according to the jaw plane inclination angle to obtain a final occlusion induction appliance digital model.
The personalized design of the occlusion induction appliance digital model is carried out according to the initial dental digital model of the patient, so that the obtained occlusion induction appliance digital model is more adaptive to the dental growth condition of a user, the problem that the user cannot wear the dental appliance is avoided, and the orthodontic effect and the wearing comfort are improved; in addition, through setting up the guide rail model in anterior tooth guide area, can form corresponding guide rail groove in the anterior tooth district in the occlusion induction appliance digital model based on this guide rail model, guide the growth of all teeth of anterior tooth guide area through the guide rail groove, can effectively improve anterior tooth bucktooth, the circumstances of anterior tooth anti-jaw, simultaneously, can realize the correction to jaw plane inclination through adjusting jaw pad thickness and guide rail groove degree of depth, improve the too big problem of jaw plane inclination.
Optionally, the step of determining the anterior tooth guiding region comprises:
and taking a preset anterior tooth area as the anterior tooth guiding area.
Optionally, the step of determining the anterior tooth guiding region comprises:
and determining the front tooth guiding area according to the distribution positions of the unerupted front teeth.
The front tooth guiding area is determined according to the actual distribution position of the front teeth which are not erupted, the front tooth guiding area can be prevented from being set to be too large or too small, the size of the area which is primarily corrected through guiding is proper, and the correction effect on the front teeth of the front teeth and the front teeth of the back jaw is ensured.
Preferably, step A3 comprises:
determining a total displacement and a total correction angle for fitting the tooth model in the anterior tooth guide region to a target arch;
step-by-step design is carried out on the displacement and the correction angle of the tooth model in the front tooth guiding area according to the total displacement and the total correction angle so as to obtain a single-step displacement and a single-step correction angle;
and adjusting the position and the inclination angle of the tooth model in the front tooth guiding area according to the single-step displacement amount and the single-step correction angle.
By adjusting the position and the inclination angle of the tooth model in the front tooth guiding area, and then establishing a guide rail model according to the adjusted tooth model, the guide rail groove in the final occlusion induction appliance digital model can effectively guide the teeth in the front tooth guiding area, so that the teeth in the front tooth guiding area gradually fit with the target arch.
Optionally, step A4 includes:
B1. establishing an auxiliary plane through the gingival margin of the anterior tooth guide region and projecting the modified tooth of the anterior tooth guide region onto the auxiliary plane;
B2. generating a first closed envelope of projections of all the modified teeth in the auxiliary plane;
B3. stretching a plane surrounded by the first closed envelope line towards a direction away from gums of the anterior tooth guiding region to form a corresponding guide rail model;
B4. and performing Boolean sum operation on the guide rail model and the first dental model to obtain the second dental model.
Optionally, step A4 includes:
C1. generating an upper closed envelope, a middle closed envelope and a lower closed envelope respectively positioned at the upper part, the middle part and the lower part of the tooth model according to the shape and the size of the tooth model of the front tooth guiding region;
C2. the plane surrounded by the upper closed envelope is taken as a top surface, the plane surrounded by the lower closed envelope is taken as a bottom surface, the upper closed envelope, the middle closed envelope and the lower closed envelope are taken as tracks to sweep and generate a peripheral surface, and the top surface, the bottom surface and the peripheral surface are used for enclosing an entity to obtain a corresponding guide rail model;
C3. and performing Boolean sum operation on the guide rail model and the first dental model to obtain the second dental model.
Preferably, step A5 comprises:
generating an occlusion induction appliance body base block according to the second dental model;
and performing Boolean subtraction operation on the second dental model and the main body basic block of the occlusion induction appliance to obtain a primary occlusion induction appliance digital model containing the guide rail groove.
Preferably, step A6 comprises:
and according to the jaw plane inclination angle, reducing the depth of a guide rail groove of the upper jaw, and thickening a jaw pad of a rear tooth area of the lower jaw to obtain a final occlusion induction appliance digital model.
By reducing the depth of the guide rail groove of the upper jaw, upward correction force can be formed on the upper front tooth, meanwhile, by thickening the jaw pad of the rear tooth area of the lower jaw, downward correction force can be formed on the lower rear tooth, under the combined action of the two correction forces, the rear side of the jaw plane can be gradually raised and the front side can be gradually lowered, and finally, the inclination angle of the jaw plane reaches the target inclination angle.
In a second aspect, the present application provides a method of manufacturing an occlusion-inducing appliance comprising the steps of:
s1, generating an occlusion induction appliance digital model based on the occlusion induction appliance design method;
s2, adopting a 3D printing process, and printing according to the digital model of the occlusion induction appliance to obtain the occlusion induction appliance.
In a third aspect, the present application provides an occlusion-inducing appliance comprising a labial outer wall, a lingual outer wall, upper and lower alveoli disposed between the labial outer wall and the lingual outer wall, and a jaw pad disposed between the upper and lower alveoli; the front tooth areas of the upper tooth groove and the lower tooth groove are provided with guide rail grooves, and the occlusion induction appliance is manufactured by the manufacturing method of the occlusion induction appliance.
The beneficial effects are that: according to the occlusion induction appliance and the design and manufacturing method thereof, the personalized design of the occlusion induction appliance digital model is carried out according to the initial dental digital model of the patient, so that the obtained occlusion induction appliance digital model is more adaptive to the dental growth condition of the user, the problem that the appliance cannot be worn is avoided, and the orthodontic effect and the wearing comfort are improved; in addition, through setting up the guide rail model in anterior tooth guide area, can form corresponding guide rail groove in the anterior tooth district in the occlusion induction appliance digital model based on this guide rail model, guide the growth of all teeth of anterior tooth guide area through the guide rail groove, can effectively improve anterior tooth bucktooth, the circumstances of anterior tooth anti-jaw, simultaneously, can realize the correction to jaw plane inclination through adjusting jaw pad thickness and guide rail groove degree of depth, improve the too big problem of jaw plane inclination.
Drawings
Fig. 1 is a flowchart of a method for designing an occlusion-inducing appliance according to an embodiment of the present application.
Fig. 2 is a flowchart of a method of manufacturing an occlusion-inducing appliance according to an embodiment of the present application.
Fig. 3 is a schematic structural view of an occlusion-inducing appliance according to an embodiment of the present application.
Fig. 4 is a schematic diagram of an exemplary digital dental model.
Fig. 5 is a dental bitmap of an exemplary dental jaw.
Fig. 6 is a schematic diagram of a digital model of the dentition creating an upper dentition guide model.
Fig. 7 is a schematic view of an orthodontic appliance body base block.
Fig. 8 is a schematic diagram of the jaw plane inclination angle correction process.
Fig. 9 is a schematic view of the inclination angle adjustment process of the tooth model in the front tooth guide region.
Description of the reference numerals: 100. a digital model of the upper jaw; 200. a digital model of the mandible; 300. jaw pad; 400. a guide rail groove.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, a method of designing an occlusion-inducing appliance for a patient having at least one unerupted anterior tooth according to some embodiments of the present application includes the steps of:
A1. acquiring an initial dental digital model and a jaw plane inclination angle of a person, and determining an anterior tooth guiding area;
A2. establishing a tooth model of unerupted front teeth in the initial tooth jaw digital model to form a first tooth jaw model;
A3. adjusting the position and the inclination angle of the tooth model in the front tooth guiding region in the first tooth jaw model;
A4. generating a guide rail model in the first dental model based on the tooth model of the adjusted front dental guide region, and combining the guide rail model with the first dental model to form a second dental model;
A5. generating a preliminary occlusion induction appliance digital model according to the second dental model; the occlusion induction appliance digital model comprises a guide rail groove matched with the guide rail model;
A6. and adjusting the jaw pad thickness and the guide rail groove depth of the primary occlusion induction appliance digital model according to the jaw plane inclination angle to obtain the final occlusion induction appliance digital model.
The personalized design of the occlusion induction appliance digital model is carried out according to the initial dental digital model of the patient, so that the obtained occlusion induction appliance digital model is more adaptive to the dental growth condition of a user, the problem that the user cannot wear the dental appliance is avoided, and the orthodontic effect and the wearing comfort are improved; in addition, through setting up the guide rail model in anterior tooth guide area, can form corresponding guide rail groove in the anterior tooth district in the occlusion induction appliance digital model based on this guide rail model, guide the growth of all teeth of anterior tooth guide area through the guide rail groove, can effectively improve anterior tooth bucktooth, the circumstances of anterior tooth anti-jaw, simultaneously, can realize the correction to jaw plane inclination through adjusting jaw pad thickness and guide rail groove degree of depth, improve the too big problem of jaw plane inclination.
Wherein, the initial dental digital model refers to a dental digital model at the beginning time of a current treatment stage (the whole orthodontic process comprises a plurality of treatment stages), and if the current treatment stage is the first treatment stage in the whole orthodontic process, the initial dental digital model actually refers to a dental digital model of a user before receiving treatment.
Wherein, the initial dental digital model refers to a dental digital model at the beginning time of a current treatment stage (the whole orthodontic process comprises a plurality of treatment stages), and if the current treatment stage is the first treatment stage in the whole orthodontic process, the initial dental digital model actually refers to a dental digital model of a user before receiving treatment.
Wherein, referring to fig. 4, the dental digital model generally includes a maxillary digital model 100 and a mandibular digital model 200, the maxillary digital model 100 including an upper dentition model (the upper dentition model being composed of a plurality of upper dentition models), a maxillary model and an upper gingival model, the mandibular digital model 200 including a lower dentition model (the lower dentition model being composed of a plurality of lower dentition models), a mandibular model and a lower gingival model; wherein the placement between the digital maxillary model 100 and the digital mandibular model 200 is based on a bite relationship (which actually refers to the relative position between the digital maxillary model 100 and the digital mandibular model 200).
Wherein, the prior art can be adopted to obtain the initial dental digital model of the user; for example, three-dimensional data of peripheral tissues such as teeth, jawbone and gingiva are obtained through an optical scanning technology, an X-ray or ultrasonic imaging technology, a CT scanning or nuclear magnetic resonance technology, a digital model of the parts is further established through manual segmentation, computer automatic segmentation or semi-automatic segmentation combined with the two modes, so that an initial upper jaw digital model and an initial lower jaw digital model are obtained, a skull side bitmap is obtained through an X-ray or ultrasonic imaging technology, a CT scanning or nuclear magnetic resonance technology, meshing parameters such as an FH plane and a condylar conduction gradient are obtained according to the skull side bitmap, and finally the initial upper jaw digital model and the initial lower jaw digital model are positioned based on the meshing parameters, so that an initial dental digital model is obtained.
The jaw plane refers to an imaginary plane formed from the mesial abutment of the mesial incisors of the bilateral maxillary incisors to the mesial tip of the bilateral first molar, and referring to fig. 8, the OH plane in the drawing is the jaw plane. Normally, the front side of the jaw plane is inclined downward at a certain angle (as in the case of the right side of fig. 8), but sometimes, some patients may have an excessively large inclination angle (as in the case of the left side of fig. 8), seriously affecting the beauty, and thus the inclination angle needs to be corrected. The jaw plane tilt angle of the patient can be obtained from an initial dental digital model, which is known in the art and will not be described in detail here.
In some embodiments, the step of determining the anterior guide region comprises:
the preset anterior tooth region is taken as an anterior tooth guiding region.
The anterior tooth guiding area is determined in the mode, and efficiency is high.
For example, the preset anterior tooth region may be an anterior tooth 2-2 region, an anterior tooth 3-3 region, an anterior tooth 4-4 region, or the like, but is not limited thereto. Referring to the bitmap shown in fig. 5, for the upper dentition, the front tooth 2-2 region refers to the region from the number 12 tooth to the number 22 tooth, the front tooth 3-3 region refers to the region from the number 13 tooth to the number 23 tooth, the front tooth 4-4 region refers to the region from the number 14 tooth to the number 24 tooth, and so on; for the following dentition, the anterior tooth 2-2 region refers to the region from tooth 42 to tooth 32, the anterior tooth 3-3 region refers to the region from tooth 43 to tooth 33, the anterior tooth 4-4 region refers to the region from tooth 44 to tooth 34, and so on.
In other embodiments, the step of determining the anterior guide region comprises:
and determining the front tooth guiding area according to the distribution positions of the unerupted front teeth.
The front tooth guiding area is determined according to the actual distribution position of the front teeth which are not erupted, the front tooth guiding area can be prevented from being set to be too large or too small, the size of the area which is primarily corrected through guiding is proper, and the correction effect on the front teeth of the front teeth and the front teeth of the back jaw is ensured.
Specifically, the step of determining the anterior tooth guiding region according to the distribution position of unerupted anterior teeth comprises:
if unexplored front teeth exist in both the upper dentition and the lower dentition, acquiring unexplored front teeth which are outermost along the left side and the right side in the upper dentition and marking the unexplored front teeth as first reference teeth, and acquiring unexplored front teeth which are outermost along the left side and the right side in the lower dentition and marking the unexplored front teeth as second reference teeth; the teeth in the upper dentition symmetrical to the first reference tooth are used as third reference teeth, and the teeth in the lower dentition symmetrical to the second reference tooth are used as fourth reference teeth; the region from the first reference tooth to the third reference tooth in the upper dentition is taken as an anterior tooth guiding region of the upper dentition, and the region from the second reference tooth to the fourth reference tooth in the lower dentition is taken as an anterior tooth guiding region of the lower dentition;
if only the upper dentition has unerupted front teeth, acquiring unerupted front teeth which are outermost along the left side and the right side in the upper dentition, and marking the unerupted front teeth as first reference teeth; the teeth symmetrical to the first reference teeth in the above dentition are used as third reference teeth; the region from the first reference tooth to the third reference tooth in the upper dentition is taken as an anterior tooth guiding region of the upper dentition, and the region corresponding to the anterior tooth guiding region of the upper dentition in the lower dentition is taken as an anterior tooth guiding region of the lower dentition (for example, if the anterior tooth guiding region of the upper dentition is an anterior tooth 3-3 region of the upper dentition, the anterior tooth guiding region of the lower dentition is an anterior tooth 3-3 region of the lower dentition);
if only the lower dentition has unerupted anterior teeth, acquiring unerupted anterior teeth which are outermost along the left side and the right side in the lower dentition, and marking the unerupted anterior teeth as second reference teeth; the teeth symmetrical to the second reference teeth in the above dentition are used as fourth reference teeth; the region of the second reference tooth to the fourth reference tooth in the upper dentition is referred to as the anterior tooth guide region of the lower dentition, and the region of the upper dentition corresponding to the anterior tooth guide region of the lower dentition is referred to as the anterior tooth guide region of the upper dentition (for example, if the anterior tooth guide region of the lower dentition is the anterior tooth 3-3 region of the lower dentition, the anterior tooth guide region of the upper dentition is the anterior tooth 3-3 region of the upper dentition).
For example, the 11 th tooth and the 22 th tooth of the upper dentition are unexplored anterior teeth, the unexplored anterior teeth outermost along the left and right sides are 22 th teeth, so that the first reference tooth is 22 th tooth, the 12 th tooth symmetrical to the 22 th tooth is the third reference tooth, and the anterior tooth guiding area of the upper dentition is the area from the 12 th tooth to the 22 th tooth; the method of determining the anterior guide area of the lower dentition is similar thereto and will not be described in detail herein.
In step A2, the position and the shape and the size of the unerupted front teeth after unerupted front teeth are predicted (this is the prior art, and details thereof are not described here), so as to obtain predicted data of the unerupted front teeth, and a corresponding tooth model is built in the initial tooth jaw digital model according to the predicted data, so as to obtain the first tooth jaw model.
Specifically, step A3 includes:
A301. determining a total displacement and a total correction angle for fitting the tooth model in the anterior tooth guide region to the target arch;
A302. step-by-step design is carried out on the displacement and the correction angle of the tooth model in the front tooth guiding area according to the total displacement and the total correction angle so as to obtain a single-step displacement and a single-step correction angle;
A303. the position and the inclination angle of the tooth model in the front tooth guiding region are adjusted according to the single-step displacement amount and the single-step correction angle.
By adjusting the position and the inclination angle of the tooth model in the front tooth guiding area, and then establishing a guide rail model according to the adjusted tooth model, the guide rail groove in the final occlusion induction appliance digital model can effectively guide the teeth in the front tooth guiding area (the guide rail groove can provide a position correcting force for the teeth in the guiding area and can also provide a torsion correcting force for the teeth with abnormal inclination angle, so that the position and the inclination angle of the teeth are improved at the same time), and the teeth in the front tooth guiding area are gradually matched with the target arch.
The target arch is the arch expected to be reached at the end of the whole orthodontic process, and can be determined according to patient information (such as age, height, weight, sex and the like) of a patient and related standard arch data reference tables, can be manually determined (such as determined by a doctor), or can be determined by other prior art techniques.
In step a301, the position of the tooth model in the front tooth guiding area in the target arch is acquired and recorded as a target position, and the distance between the current position and the corresponding target position of the tooth model in the front tooth guiding area is calculated to obtain the corresponding total displacement. Referring to fig. 9, there is shown an adjustment process of the inclination angle of the tooth model in the front tooth guide region, wherein the left view shows the initial inclination angle of the tooth model, and the right view shows the target inclination angle of the tooth model (i.e., the inclination angle expected to be reached at the end of the entire orthodontic process); wherein the inclination angle is an angle at which the tooth model is inclined back and forth around the tooth root; the angle deviation between the target inclination angle and the initial inclination angle is the total correction angle.
In step a302, the displacement and the correction angle of the tooth model in the front tooth guiding area are designed step by step according to the number of treatment stages (divided according to actual needs) divided in the whole orthodontic process, for example, the total displacement and the total correction angle are divided equally according to the number of treatment stages, so as to obtain a single-step displacement amount and a single-step correction angle (assuming that the total displacement is S1, the total correction angle is R1, the number of divided treatment stages is N, the single-step displacement amount is S1/N, and the single-step correction angle is R1/N) in each treatment stage.
In step a303, for the current treatment stage, the position of the tooth model in the anterior tooth guiding region may be moved toward the corresponding target position by a single-step displacement amount on the basis of the first tooth model, and the tooth model in the anterior tooth guiding region may be swung around the tooth root toward the corresponding target inclination angle position by a single-step correction angle.
In some embodiments, step A4 comprises:
B1. establishing an auxiliary plane passing through the gingival margin of the anterior tooth guide region and projecting the corrected tooth of the anterior tooth guide region onto the auxiliary plane;
B2. generating a first closed envelope of projections of all the modified teeth in the auxiliary plane;
B3. stretching a plane surrounded by the first closed envelope line towards a direction away from gums of the front tooth guiding region to form a corresponding guide rail model;
B4. and performing Boolean sum operation on the guide rail model and the first dental model to obtain a second dental model.
Wherein the auxiliary plane is preferably a plane parallel to the jaw plane.
In step B2, a front envelope (or labial envelope) and a rear envelope (or lingual envelope) of projections of all tooth models of the front tooth guide area are generated in the auxiliary plane, and the front envelope and the rear envelope are smoothed, and the left end points of the front envelope and the rear envelope are connected, and the right end points of the front envelope and the rear envelope are connected to form a first closed envelope.
In step B3, for the front tooth guiding region of the upper dentition, the plane surrounded by the first closed envelope is stretched downward to form a corresponding guide rail model, and for the front tooth guiding region of the lower dentition, the plane surrounded by the first closed envelope is stretched upward to form a corresponding guide rail model. Wherein the stretched length is greater than or equal to the maximum value of the distance of the cusps of the respective tooth models in the anterior tooth guiding region from the auxiliary plane, to ensure that the guide rail model covers all tooth models in the anterior tooth guiding region.
In other embodiments, step A4 comprises:
C1. generating an upper closed envelope, a middle closed envelope and a lower closed envelope respectively positioned at the upper part, the middle part and the lower part of the tooth model according to the shape and the size of the tooth model of the front tooth guiding area;
C2. the plane surrounded by the upper sealed envelope is used as a top surface, the plane surrounded by the lower sealed envelope is used as a bottom surface, the upper sealed envelope, the middle sealed envelope and the lower sealed envelope are used as tracks to sweep and generate a peripheral surface, and the top surface, the bottom surface and the peripheral surface are used for enclosing an entity to obtain a corresponding guide rail model;
C3. and performing Boolean sum operation on the guide rail model and the first dental model to obtain a second dental model.
In step C1, an upper plane passing through the upper portion of each tooth model, a middle plane passing through the middle portion of each tooth model, and a lower plane passing through the lower portion of each tooth model may be established at the anterior tooth guiding region, the planes, middle planes, and lower planes are all parallel to the jaw plane, intersecting lines of the upper plane, middle plane, lower plane, and outer surfaces of each corrected tooth are extracted and respectively denoted as an upper intersecting line, a middle intersecting line, and a lower intersecting line, and closed envelopes of all the upper intersecting lines are generated on the upper plane and denoted as upper closed envelopes (specific generating methods refer to the first closed envelope generating method of step B2, and are not repeated herein), closed envelopes of all the middle intersecting lines are generated on the middle plane and closed envelopes of all the lower intersecting lines are denoted as lower closed envelopes.
In the step C2, the upper end point and the lower end point of the upper closed envelope are used as the curves of the lower closed envelope and the upper closed envelope, the middle closed envelope and the lower closed envelope, which are intersected with the middle closed envelope, to sweep the upper closed envelope, the middle closed envelope and the lower closed envelope as the tracks to generate the peripheral surface.
Preferably, after step C1 and before step C2, the method may further comprise the steps of: C4. and adjusting the upper and lower positions of the upper closed envelope and the lower closed envelope. Specifically, the upper closed envelope is moved up and the lower closed envelope is moved down to ensure that the resulting guide rail model is able to encapsulate all tooth models of the anterior tooth guide region; the distance between the upward movement and the downward movement can be set according to actual needs.
For example, fig. 6 is a schematic diagram of a digital model of the dental jaw for building an upper dentition guide model, where e1 is the guide model.
Specifically, step A5 includes:
A501. generating an occlusion induction appliance main body base block according to the second dental model;
A502. and performing Boolean subtraction operation on the second dental model and the main body base block of the occlusion induction appliance to obtain a primary occlusion induction appliance digital model containing the guide rail groove.
Wherein, step a501 includes: generating a lingual upper edge contour line, a lingual lower edge contour line, a labial upper edge contour line and a labial lower edge contour line according to the second dental model (each edge contour line can be generated by adopting the prior art, and is not described in detail herein), generating an upper surface by taking the lingual upper edge contour line and the labial upper edge contour line as track sweeps, generating a lingual side by taking the lingual lower edge contour line and the labial lower edge contour line as track sweeps, generating a labial side by taking the lingual upper edge contour line and the lingual lower edge contour line as track sweeps, generating a labial side by taking the labial upper edge contour line and the labial lower edge contour line as track sweeps, closing the left end of the upper surface, the lower surface, the lingual side and the labial side to obtain a left end surface, closing the upper surface, the lower surface, the lingual side and the right end of the labial side to obtain a right end surface, and enclosing the upper surface, the lingual side, the left end surface and the right end to form a solid, thereby obtaining the orthodontic appliance body block.
Referring to fig. 7, an exemplary orthodontic appliance body base block is shown, wherein curve d1 is a lingual upper edge contour, curve d2 is a labial upper edge contour, curve d3 is a lingual lower edge contour, curve d4 is a labial lower edge contour, plane f3 is an upper surface, plane f4 is a lower surface, plane f1 is a lingual side, plane f2 is a labial side, plane f5 is a left end, and plane f6 is a right end.
The upper tooth groove matched with the upper tooth row and the lower tooth groove matched with the lower tooth row can be formed on the upper surface and the lower surface of the main body base block of the orthodontic appliance by using the second tooth jaw model to perform Boolean subtraction operation, and the front tooth guiding areas in the upper tooth groove and the lower tooth groove are guide rail grooves matched with corresponding guide rail models. In the primary occlusion induction appliance digital model, a solid part between an upper tooth socket and a lower tooth socket of a rear tooth area is a jaw pad.
Specifically, step A6 includes:
and according to the jaw plane inclination angle, reducing the depth of the guide rail groove of the upper jaw, and thickening the jaw pad of the rear tooth area of the lower jaw to obtain the final occlusion induction appliance digital model.
By reducing the depth of the guide rail groove of the upper jaw, upward correction force can be formed on the upper front tooth, meanwhile, by thickening the jaw pad of the rear tooth area of the lower jaw, downward correction force can be formed on the lower rear tooth, under the combined action of the two correction forces, the rear side of the jaw plane can be gradually raised and the front side can be gradually lowered, and finally, the inclination angle of the jaw plane reaches the target inclination angle.
Referring to fig. 8, since the position of the maxilla is substantially unchangeable, in order to reduce the inclination angle of the jaw plane, the vertical height of the anterior maxilla is reduced mainly by changing the position of the mandible while inhibiting the growth of the anterior maxilla; here, by reducing the depth of the guide rail groove of the upper jaw, the teeth of the upper jaw front tooth guide area are pressed by the groove bottom of the upper guide rail groove to suppress growth, thereby reducing the vertical height of the teeth of the upper jaw front tooth guide area, and by thickening the jaw pad of the rear tooth area of the lower jaw, the rear teeth of the lower jaw are pressed to suppress growth, thereby reducing the vertical height of the rear teeth of the lower jaw, and finally, the front side of the jaw plane is adjusted upward, the rear side is adjusted downward, and finally, the target jaw plane inclination angle (i.e., the jaw plane inclination angle desired to be reached at the end of the entire orthodontic procedure) is reached.
The vertical height of the teeth of the front tooth guiding area of the upper jaw and the vertical height of the rear teeth of the lower jaw can be respectively recorded as a first vertical height and a second vertical height under the inclination angle of the target jaw plane; then acquiring the actual vertical height of the tooth model of the front tooth guiding area of the jaw in the second tooth jaw model and the actual vertical height of the rear tooth model of the lower tooth jaw; subtracting the first vertical height from the actual vertical height of each tooth model of the front tooth guiding area of the upper jaw to obtain the total depth of the upper guide rail groove at each tooth model of the front tooth guiding area of the upper jaw, and adjusting the depth of the upper guide rail groove (realized by raising the bottom of the upper guide rail groove) according to the calculation result; subtracting the second vertical height from the actual vertical height of each posterior model of the mandible to obtain a total thickness that the jaw pad of the posterior region of the mandible needs to be increased at each posterior model, and adjusting the thickness of the jaw pad of the posterior region of the mandible (by moving down the lower surface of the jaw pad of the posterior region of the mandible) according to the calculation result.
In practice, if the angle deviation between the target jaw plane inclination angle and the current jaw plane inclination angle is too large (i.e. greater than a preset deviation threshold, which may be set according to actual needs), the depth reduction of the upper guide rail groove and the thickness increase of the jaw pad of the posterior dental region of the lower jaw may be designed step by step to obtain a single step depth reduction of the upper guide rail groove and a single step thickness increase of the jaw pad of the posterior dental region of the lower jaw (e.g. dividing the total depth required to be reduced at each tooth model of the anterior dental guide region of the upper guide rail groove by the number of treatment stages to obtain a corresponding single step depth reduction, dividing the total thickness required to be increased at each posterior dental model by the number of treatment stages for the jaw pad of the posterior dental region of the lower jaw by the corresponding single step depth reduction, and then making the groove bottom of the upper guide rail groove reduce the depth of the corresponding single step depth reduction at each tooth model and making the jaw pad of the posterior dental region of the lower jaw increase the corresponding single step depth increase at each posterior dental model on the basis of the initial occlusion inducer digital model. Thereby avoiding wearing discomfort caused by an excessive single-step correction.
Referring to fig. 2, the present application provides a method of manufacturing an occlusion-inducing appliance comprising the steps of:
s1, generating an occlusion induction appliance digital model based on the occlusion induction appliance design method;
s2, adopting a 3D printing process, and printing according to the digital model of the occlusion induction appliance to obtain the occlusion induction appliance.
Compared with the traditional mode of preparing the solid die according to the digital model of the orthodontic appliance and then preparing the orthodontic appliance according to the solid die, the production cost is lower, and the method is more suitable for customized production.
Preferably, step S2 includes:
printing by using a medical material to obtain an occlusion induction appliance; the medical material comprises at least one of liquid silica gel, thermoplastic elastomer, TPU, TPE, polyurethane, nylon and PETG.
Referring to fig. 3, the present application provides an occlusion-inducing appliance comprising labial and lingual walls, upper and lower alveoli disposed between the labial and lingual walls, and a jaw pad disposed between the upper and lower alveoli; the front tooth areas of the upper tooth groove and the lower tooth groove are provided with guide rail grooves, and the occlusion induction appliance is manufactured by the manufacturing method of the occlusion induction appliance.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method of designing an occlusion-inducing appliance for a patient having at least one unerupted anterior tooth, comprising the steps of:
A1. acquiring an initial dental digital model and a jaw plane inclination angle of a person, and determining an anterior tooth guiding area;
A2. establishing a tooth model of unexplored front teeth in the initial tooth jaw digital model to form a first tooth jaw model;
A3. adjusting the position and inclination angle of the tooth model in the anterior tooth guiding region in the first dental model;
A4. generating a guide rail model in the first dental model based on the adjusted dental model of the front dental guide region, and combining the guide rail model with the first dental model to form a second dental model;
A5. generating a preliminary occlusion induction appliance digital model according to the second dental model; the occlusion induction appliance digital model comprises a guide rail groove matched with the guide rail model;
A6. and adjusting the jaw pad thickness and the guide rail groove depth of the primary occlusion induction appliance digital model according to the jaw plane inclination angle to obtain a final occlusion induction appliance digital model.
2. The bite-inducing appliance design method of claim 1, wherein said step of determining an anterior tooth guide area comprises:
and taking a preset anterior tooth area as the anterior tooth guiding area.
3. The bite-inducing appliance design method of claim 1, wherein said step of determining an anterior tooth guide area comprises:
and determining the front tooth guiding area according to the distribution positions of the unerupted front teeth.
4. The bite-inducing appliance design method of claim 1, wherein step A3 comprises:
determining a total displacement and a total correction angle for fitting the tooth model in the anterior tooth guide region to a target arch;
step-by-step design is carried out on the displacement and the correction angle of the tooth model in the front tooth guiding area according to the total displacement and the total correction angle so as to obtain a single-step displacement and a single-step correction angle;
and adjusting the position and the inclination angle of the tooth model in the front tooth guiding area according to the single-step displacement amount and the single-step correction angle.
5. The bite-inducing appliance design method of claim 1, wherein step A4 comprises:
B1. establishing an auxiliary plane through the gingival margin of the anterior tooth guide region and projecting the modified tooth of the anterior tooth guide region onto the auxiliary plane;
B2. generating a first closed envelope of projections of all the modified teeth in the auxiliary plane;
B3. stretching a plane surrounded by the first closed envelope line towards a direction away from gums of the anterior tooth guiding region to form a corresponding guide rail model;
B4. and performing Boolean sum operation on the guide rail model and the first dental model to obtain the second dental model.
6. The bite-inducing appliance design method of claim 1, wherein step A4 comprises:
C1. generating an upper closed envelope, a middle closed envelope and a lower closed envelope respectively positioned at the upper part, the middle part and the lower part of the tooth model according to the shape and the size of the tooth model of the front tooth guiding region;
C2. the plane surrounded by the upper closed envelope is taken as a top surface, the plane surrounded by the lower closed envelope is taken as a bottom surface, the upper closed envelope, the middle closed envelope and the lower closed envelope are taken as tracks to sweep and generate a peripheral surface, and the top surface, the bottom surface and the peripheral surface are used for enclosing an entity to obtain a corresponding guide rail model;
C3. and performing Boolean sum operation on the guide rail model and the first dental model to obtain the second dental model.
7. The bite-inducing appliance design method of claim 1, wherein step A5 comprises:
generating an occlusion induction appliance body base block according to the second dental model;
and performing Boolean subtraction operation on the second dental model and the main body basic block of the occlusion induction appliance to obtain a primary occlusion induction appliance digital model containing the guide rail groove.
8. The bite-inducing appliance design method of claim 1, wherein step A6 comprises:
and according to the jaw plane inclination angle, reducing the depth of a guide rail groove of the upper jaw, and thickening a jaw pad of a rear tooth area of the lower jaw to obtain a final occlusion induction appliance digital model.
9. A method of making an occlusion-inducing appliance comprising the steps of:
s1, generating an occlusion induction appliance digital model based on the occlusion induction appliance design method of any one of claims 1-8;
s2, adopting a 3D printing process, and printing according to the digital model of the occlusion induction appliance to obtain the occlusion induction appliance.
10. An occlusion-inducing appliance comprising a labial outer wall, a lingual outer wall, upper and lower tooth slots disposed between the labial outer wall and the lingual outer wall, and a jaw pad disposed between the upper and lower tooth slots; the method is characterized in that the front tooth areas of the upper tooth groove and the lower tooth groove are provided with guide rail grooves, and the occlusion induction appliance is manufactured by the manufacturing method of the occlusion induction appliance of claim 9.
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| CN202310925206.4A CN116807645A (en) | 2023-07-26 | 2023-07-26 | Occlusion induction appliance and design and manufacturing methods thereof |
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| CN202310925206.4A CN116807645A (en) | 2023-07-26 | 2023-07-26 | Occlusion induction appliance and design and manufacturing methods thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118965472A (en) * | 2024-10-16 | 2024-11-15 | 佛山臻硅科技有限公司 | A corrective device for adjusting the mandibular plane angle and its design and manufacturing method |
| CN118965473A (en) * | 2024-10-16 | 2024-11-15 | 佛山臻硅科技有限公司 | An appliance for correcting upper and lower front teeth and its design and manufacturing method |
-
2023
- 2023-07-26 CN CN202310925206.4A patent/CN116807645A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118965472A (en) * | 2024-10-16 | 2024-11-15 | 佛山臻硅科技有限公司 | A corrective device for adjusting the mandibular plane angle and its design and manufacturing method |
| CN118965473A (en) * | 2024-10-16 | 2024-11-15 | 佛山臻硅科技有限公司 | An appliance for correcting upper and lower front teeth and its design and manufacturing method |
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