CN115300138A - Computer aided design method for deciding orthodontic orthognathic combined treatment operation time - Google Patents
Computer aided design method for deciding orthodontic orthognathic combined treatment operation time Download PDFInfo
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06T19/00—Manipulating 3D models or images for computer graphics
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H20/00—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance
- G16H20/40—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H80/00—ICT specially adapted for facilitating communication between medical practitioners or patients, e.g. for collaborative diagnosis, therapy or health monitoring
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2200/00—Indexing scheme for image data processing or generation, in general
- G06T2200/04—Indexing scheme for image data processing or generation, in general involving 3D image data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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Abstract
The invention discloses a computer-aided design method for deciding orthodontic orthognathic combined treatment surgery opportunity, which relates to the technical field of computer-aided design and comprises the following steps: acquiring three-dimensional holographic skull data, performing virtual preoperative orthodontic treatment on alveolar bones with information of crowns and tooth roots, performing virtual osteotomy on upper and lower jawbones based on tooth arrangement after virtual preoperative orthodontic treatment, and locking correct position relations of the upper and lower jawbones and dentitions; on the virtual upper and lower jaw complex body with the correct position relation of the upper and lower jaws, the change process that the occlusion relation of the upper and lower teeth of the original dentition gradually transits from a disordered state to a stable state is previewed, and a series of stable occlusion states obtained by automatic detection of a computer are screened to obtain the earliest stable middle occlusion state of the upper and lower dentitions reaching the operation time. The invention avoids the unpredictability that the traditional orthodontic and orthognathic combination scheme treatment excessively depends on the experience of doctors, and has important guiding significance on the orthodontic and orthognathic combination treatment.
Description
The invention relates to a divisional application named as a computer-aided design method for deciding orthodontic and orthognathic combined treatment surgery opportunity, wherein the application number of a parent case is 202010173389.5, and the application date is 2020.03.12.
Technical Field
The invention relates to the technical field of computer-aided design, in particular to a computer-aided design method for deciding orthodontic orthognathic combined treatment surgery opportunity.
Background
Orthodontic and orthognathic combination therapy is an important medical means for correcting osseous dentogorofacial deformity and needs orthodontists and orthognathic surgeons to perform the treatment together. The traditional orthodontic orthognathic combination treatment process comprises the following steps: after a combined treatment scheme is formulated, orthodontists firstly carry out preoperative orthodontic treatment to fully reveal bone deformity, and then orthognathic doctors design and carry out operations, the operations immediately achieve approximately normal occlusion relation, but the occlusion of individual teeth is not good enough, and the continuous improvement needs to be carried out through postoperative orthodontic treatment. The relative position relationship between the upper jaw and the lower jaw is the basis for orthodontists to shape the surface shape and the basis for orthodontists to reshape the occlusion relationship, is an important technical link for the treatment handover of two department doctors, and is a key node influencing the treatment effect. The traditional treatment mode of the link is as follows: orthodontists ' and go and look ' before the art when just performing orthodontic treatment, constantly gather patient's interlock model and carry out manual pair-matching, until think that the upper and lower jaw tooth can both reach stable interlock relation, transfer to the orthognathic surgeon and carry out the operation. The method has 3 defects: 1. orthodontists lack clear goals for preoperative orthodontics, and have low treatment efficiency, often requiring 2-3 years, or even longer; 2. the speed and quality of preoperative orthodontics highly depend on the experience of orthodontists, and the standardization cannot be realized, so that the popularization and the application of medical technology are severely limited; 3. in the long preoperative orthodontic treatment process, the occlusion relation of patients is increasingly worsened, and the condition of each time is gradually improved, so that the 'beauty and prematurity' become the reason that many patients cannot receive the treatment.
Disclosure of Invention
The invention aims to provide a computer aided design method for deciding the operation time of orthodontic and orthognathic combined treatment, which accurately and quickly determines the earliest stable middle occlusion state of upper and lower dentitions reaching the operation time, thereby implementing the operation as early as possible and shortening the whole treatment process.
In order to achieve the purpose, the invention provides the following scheme:
a computer aided design method for deciding the operation time of orthodontic orthognathic combined treatment comprises the following steps:
determining three-dimensional holographic skull data according to the three-dimensional data; the three-dimensional data comprises three-dimensional facial soft tissue data, skull CBCT data and plaster model/intraoral scan data of dentition; the three-dimensional holographic skull data comprises the jaw bone and holographic skull data corresponding to each tooth;
performing virtual preoperative orthodontics on the alveolar bone with information of the dental crown and the dental root according to the three-dimensional holographic skull data;
performing virtual osteotomy on the upper and lower jaws based on the tooth arrangement obtained after virtual preoperative orthodontic treatment, and locking the correct position relation of the upper and lower jaws and dentition to obtain a virtual upper and lower jaw complex;
replacing the virtual orthodontic back dentition in the virtual upper and lower jaw complex with an original dentition, then previewing a change process of gradually transiting the occlusion relationship of the upper and lower dentitions of the original dentition from a disordered state to a stable state on the virtual upper and lower jaw complex, automatically dividing the change process into a plurality of steps by a computer, and determining the stable occlusion state;
and screening a series of stable occlusion states obtained by the automatic detection of the computer to obtain the earliest stable middle occlusion state of the upper dentition and the lower dentition reaching the operation time.
Optionally, the determining three-dimensional holographic skull data according to the three-dimensional data specifically includes:
obtaining crown data from the plaster model/intraoral scan data of the dentition;
obtaining tooth root and jaw data through skull CBCT data;
matching the dental crown data with the dental roots and the jaw data through a coordinate system and performing matrix transformation, and performing data fusion on each dental crown data and the corresponding dental roots to generate stl data;
and subtracting redundant data in the stl data to obtain three-dimensional holographic skull data containing facial bones, teeth and tooth roots.
Optionally, according to the three-dimensional holographic skull data, virtual preoperative orthodontics is performed on an alveolar bone with information of a crown and a root of a tooth, specifically including:
orthodontic tooth arrangement is respectively carried out on the upper dentition and the lower dentition, and secondary tooth axis inclination caused by abnormal positions of upper and lower jawbones is eliminated;
wherein, the step of orthodontic tooth arrangement specifically includes:
and moving teeth in the alveolar bone, setting a rotation center, and performing translation and rotation to finally achieve the results that the teeth are arranged neatly, the dentition is flat and the teeth are positioned in the middle of the alveolar bone.
Optionally, the correct positional relationship of the maxilla and the dentition includes:
the covering jaw of the upper and lower dentition is normally covered, the upper cuspid is occluded between the lower cuspid and the lower first premolar, the included angle between the upper gullet seat point, the lower gullet seat point and the nasal root point is 2-4 degrees, and the bone structure is bilaterally symmetrical.
Optionally, the correct positional relationship between the maxilla and the mandible and the dentition further comprises:
the upper middle incisor cut end is within 1/3 of the lower middle incisor cut in the vertical direction, and the upper front incisor cut end is within 3mm in front of the lower incisor cut end.
Optionally, before the step of replacing the virtual orthodontic rear dentition in the virtual upper-lower jaw complex with the original dentition, the method further comprises:
the Boolean geometric datum point is set as a basis to ensure that the matrix relation between the dentition coordinate system and the jaw bone coordinate system is kept unchanged.
Optionally, the above-mentioned previewing a change process of gradually transitioning the occlusion relationship of the upper and lower dentitions of the original dentition from a disordered state to a stable state on the virtual upper and lower jaw complex, and automatically dividing the change process into a plurality of steps by a computer, specifically including:
in the process of previewing the change process that the occlusion relation of the upper dentition and the lower dentition of the original dentition is gradually transited from a disordered state to a stable state, the computer automatically divides the change process into dozens of steps, and the virtual preoperative orthodontic process is carried out step by step according to the movement amount of each step of teeth, so that the whole process of the tooth root is ensured to be positioned in the alveolar bone.
Optionally, the screening of a series of stable occlusal states obtained by the automatic detection of the computer to obtain the earliest stable middle occlusal state of the upper and lower dentitions at the time of the operation specifically includes:
screening a series of stable occlusion states obtained by automatic detection of a computer by an orthognathic surgeon and an orthodontist through a visual platform to obtain the earliest stable middle occlusion state of upper and lower dentitions;
and determining the earliest stable occlusion state of the upper and lower dentitions, which is identified by the orthognathic surgeon and the orthodontist, as the stable middle occlusion state of the upper and lower dentitions at the operation time.
Optionally, the series of stable occlusion states detected automatically by the computer is:
the full dentition vector is superposed with the coordinate axis in the front-back direction of the coordinate system; the number of collision contact points of the full dentition is not less than 3, and the collision contact points are distributed bilaterally as much as possible.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a computer aided design method for deciding the time of an orthodontic and orthognathic combined treatment operation, which is characterized in that virtual preoperative orthodontics are carried out on alveolar bones with information of crowns and tooth roots based on three-dimensional holographic skull data, then virtual osteotomy is carried out on upper and lower jawbones, and the correct position relation between the upper and lower jawbones and dentition is locked to obtain a virtual upper and lower jaw complex; replacing the virtual orthodontic back dentition in the virtual upper and lower jaw complex with an original dentition, then previewing a change process of gradually transiting the occlusion relation of the upper and lower dentitions of the original dentition from a disordered state to a stable state on the virtual upper and lower jaw complex, automatically dividing the change process into a plurality of steps by a computer, and determining the stable occlusion state; and finally, screening a series of stable occlusion states obtained by automatic detection of a computer to obtain the earliest stable middle occlusion state of the upper dentition and the lower dentition which reaches the operation time.
The invention avoids the unpredictability that the traditional orthodontic and orthognathic combined scheme excessively depends on the experience of doctors in treatment through the whole-course digital virtual design of the computer, fills the information fault of the orthodontics and orthognathic doctors, assists the doctors to jointly decide the operation time under the condition of symmetrical information, designs the orthodontic and orthognathic integrated treatment scheme, and has important guiding significance for the orthodontics and orthognathic combined treatment. And the effective information carrier ensures the accurate implementation of the actual treatment process, thereby providing possibility for implementing the operation as early as possible and shortening the whole treatment process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other structural schematic diagrams can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart of a computer aided design method for deciding an orthodontic orthognathic combination therapy surgery occasion according to the present invention;
FIG. 2 is a three-dimensional facies view taken;
FIG. 3 is an acquired skull CBCT map;
FIG. 4 is a diagram of an acquired dentition model;
FIG. 5 is a three-dimensional holographic skull map obtained after data processing;
fig. 6 is an image of the original dentition before virtual orthodontics;
fig. 7 is an image of a virtual orthodontic posterior dentition;
fig. 8 is an image of abnormal jaw position after virtual orthodontics;
FIG. 9 is an image of the correct position of the jaw and dentition after virtual osteotomy;
FIG. 10 is a right side image view with the original dentition replaced;
FIG. 11 is a frontal image view with the original dentition replaced;
fig. 12 is a left side image with the original dentition replaced.
Description of the symbols:
1-virtual upper and lower jaw complex, A-upper gullet seat point, B-lower gullet seat point, N-nasion root point.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a computer aided design method for deciding orthodontic and orthognathic combined treatment surgery opportunity, which comprises the steps of firstly obtaining three-dimensional holographic skull data, then carrying out virtual preoperative orthodontic treatment on alveolar bones with information of crowns and tooth roots, carrying out virtual osteotomy on upper and lower jawbones based on tooth arrangement after the virtual preoperative orthodontic treatment, and locking the correct position relation of the upper and lower jawbones and dentitions; on the virtual upper and lower jaw complex body with the correct position relation of the upper and lower jaws, the change process that the occlusion relation of the upper and lower teeth of the original dentition gradually transits from the disordered state to the stable state is previewed, and a series of stable occlusion states obtained by the automatic detection of a computer are screened to obtain the earliest stable middle occlusion state of the upper and lower dentitions at the operation time.
Fig. 1 is a flowchart of a computer aided design method for deciding orthodontic orthognathic combination therapy operation time according to the invention. The method comprises the following steps:
1) Acquiring three-dimensional data including three-dimensional facial soft tissue data, skull CBCT data and dentition plaster model/intraoral scan data; and performing data processing to obtain three-dimensional holographic skull data containing the jaw bone and each tooth.
2) Virtual preoperative orthodontics are performed on alveolar bones with information of crowns and tooth roots, orthodontic tooth arrangement is performed on upper dentitions and lower dentitions respectively, and secondary tooth axis inclination caused by position abnormality of upper and lower jawbones is eliminated.
3) On the basis of virtual preoperative orthodontics, the upper and lower jaws are virtually cut by taking the normal occlusion relation of teeth as guidance, and the correct position relation of the upper and lower jaws and dentition is locked to obtain a virtual upper and lower jaw complex.
4) Replacing the virtual orthodontic back dentition in the virtual upper and lower jaw complex with the original dentition, then previewing the change process that the occlusion relation of the upper and lower dentitions of the original dentition gradually transits from a disordered state to a stable state on the virtual upper and lower jaw complex, and automatically dividing the change process into a plurality of steps by a computer.
5) According to a series of stable occlusion states obtained by automatic detection of a computer, an orthognathic surgeon and an orthodontist screen through a visual platform to obtain the earliest stable middle occlusion state of upper and lower dentitions.
6) The earliest stable occlusion state of the upper and lower dentitions which are commonly identified by the two parties is determined as the operation time.
Wherein, in step 1), the data processing means: obtaining dental crown data through plaster model/intraoral scanning data of dentition, obtaining dental root and jaw bone data through skull CBCT data, carrying out coordinate system matching and matrix transformation on the dental crown data, the dental root and jaw bone data, carrying out data fusion on each dental crown and the corresponding dental root, generating stl data, subtracting redundant data, and then combining facial soft tissue data to obtain holographic three-dimensional skull data containing facial bones, teeth and dental roots. As shown in fig. 2, fig. 3, fig. 4 and fig. 5, the three-dimensional face phase, the skull CBCT, the dentition model map and the three-dimensional holographic skull map obtained after data processing are respectively obtained.
In the step 2), the step of orthodontic tooth arrangement comprises the following steps: each tooth is moved in the alveolar process, the tooth is moved in the alveolar bone, the rotation center is set, translation and rotation are carried out, and finally the purposes that the teeth are arranged neatly and the dentition is flat and is positioned in the middle of the alveolar bone are achieved. Fig. 6 and 7 are images of the virtual orthodontic front primitive dentition and the virtual orthodontic rear dentition, respectively. In fig. 6, the orthodontic anterior primitive dentition is misaligned with the superior anterior teeth protruding. In fig. 7, after the virtual orthodontic operation, the tooth axis of each tooth is upright, the teeth are arranged orderly, and the dentition is flat without gaps.
In step 3), the correct positional relationship between the locked maxilla and mandible and dentition is as follows: the covering jaw of the upper and lower dentition is normally covered, the upper cuspid is occluded between the lower cuspid and the lower first premolar, the included angle between the upper gullet seat point A, the nasal root point N and the lower gullet seat point B is 2-4 degrees, and the bone structure is bilaterally symmetrical.
Fig. 8 and 9 are images showing the abnormal position of the virtual orthodontic maxilla and the correct positional relationship between the virtual osteotomy maxilla and the dentition, respectively. In fig. 8, after the dentition in the holographic skull obtained in step 1) is virtually orthodontic, the teeth are arranged in order, but the position of the jaw bone is still in an abnormal state before the operation; in fig. 9, the osteotomy is simulated in a computer environment according to the actual osteotomy mode, and after osteotomy, the upper and lower jawbones are independent objects; the position relation of the upper jaw and the lower jaw is changed until the upper dentition and the lower dentition are covered normally, (namely the vertical direction of the cutting end of the upper middle incisor is within 1/3 of that of the lower middle incisor, the cutting end of the upper front incisor is within 3mm in front of the cutting end of the lower incisor), the cusp of the upper cuspid is positioned between the lower cuspid and the first front molar of the lower jaw, the included angle (angle ANB) between the upper alveolar seat point A, the lower alveolar seat point B and the nasal root point N is 2-4 degrees, and the bone structure is bilaterally symmetrical. At the moment, the position relation of the maxilla and the mandible is locked and does not change any more, and a virtual maxilla and the mandible complex are obtained. By virtual osteotomy, the severity of jaw deformity is exposed, and the precise amount and direction of movement are calculated.
And 4) in the step 4), when the virtual orthodontic rear dentition in the virtual upper and lower jaw complex is replaced by the original dentition, the matrix relation between the dentition coordinate system and the jaw bone coordinate system is kept unchanged by taking the Boolean geometric datum point set before the virtual orthodontic tooth arrangement.
As shown in fig. 10, 11, and 12, the images are replaced with images of the right side, front, and left side of the original dentition. After the replacement, since the original dentition is not corrected, although the jaw position is normal, the occlusion relationship of the teeth is disturbed, and there is an unstable disturbance point. During the process of previewing the change of the occlusion relation of the upper dentition and the lower dentition of the original dentition gradually transited from a disordered state to a stable state, a computer automatically divides the change process into dozens of steps, and the virtual preoperative orthodontics are stepped according to the moving amount of teeth in each step, so that the whole process of the tooth root in the moving process is ensured to be positioned in the alveolar bone.
In the step 5), the stable middle occlusion state of the upper dentition and the lower dentition obtained by automatic detection of the computer means that: the full dentition vector is superposed with the coordinate axis in the front-back direction of the coordinate system; the total dentition collision contact points are not less than 3, and the collision contact points are distributed bilaterally and symmetrically as much as possible. The detection results are not unique and the later, the more dense the steady state.
In step 5), if the doctor finds the earliest stable occlusion state detected by the computer and can reach the stability earlier by moving a small amount of teeth, the doctor returns to step 4) to adjust the halving step to obtain the stable occlusion state as soon as possible, thereby obtaining the operation time as soon as possible.
Designing and manufacturing an occlusion guide plate for guiding the positioning in the operation after the operation time is determined according to the step 5), and producing an invisible orthodontic appliance or printing dentition model required by the whole-course tooth movement according to the pre-deduction subsection process of the step 4) for guiding the accurate orthodontics before the fixed orthodontic operation.
When the occlusion guide plate is designed and manufactured, boolean subtraction operation is carried out on the occlusion position determined in the step 5) and the arc-shaped standard geometric body and the occlusion relation three-dimensional model determined as the operation time to obtain the guide plate with the occlusion print of teeth, the relative position relation of the upper jaw and the lower jaw when the upper dentition and the lower dentition are respectively occluded on the guide plate is the relation appointed in the step 5), and 3D printing is carried out.
Compared with the prior art, the invention also has the following advantages:
1) The invention can screen the earliest operation time, and avoid the condition that the orthodontic timeliness and occlusion are increasingly worsened before the operation; meanwhile, due to the biostimulation effect, the postoperative orthodontic speed is obviously accelerated compared with that before the operation, so that the total treatment course can be obviously shortened in the early operation. The barrier of the operation priority mode is broken through, the curative effect is improved, the treatment course is shortened, the surface shape and occlusion function deterioration during preoperative orthodontics are avoided, and the satisfaction degree and experience of the treatment of the patient are improved.
2) The problems of subject cleft, treatment disjunction and unsmooth communication in the traditional orthodontic orthognathic combination treatment process are solved by using a three-dimensional digital design as a carrier, subject combination and subject intersection are really realized, and the overall level of disease treatment and the treatment effect of difficult cases are improved.
3) The invention solves the problem of 'operation time' which is most important and difficult to determine in orthodontic and orthognathic combined treatment, enables the treatment of more orthognathic and orthodontic doctors to be in seamless connection, lowers the technical threshold, breaks through the medical resource barrier, promotes the development of two subjects, and brings good news to more patients.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A computer-aided design method for deciding an orthodontic orthognathic combination treatment surgery occasion, the method comprising:
determining three-dimensional holographic skull data according to the three-dimensional data; the three-dimensional data includes three-dimensional facial soft tissue data, skull CBCT data, and plaster model/intraoral scan data of dentition; the three-dimensional holographic skull data comprises the jaw bone and holographic skull data corresponding to each tooth;
performing virtual preoperative orthodontics on the alveolar bone with information of the dental crown and the dental root according to the three-dimensional holographic skull data;
performing virtual osteotomy on the upper and lower jaws based on the tooth arrangement obtained after virtual preoperative orthodontic treatment, and locking the correct position relation of the upper and lower jaws and dentition to obtain a virtual upper and lower jaw complex;
replacing the virtual orthodontic posterior dentition in the virtual upper and lower jaw complex with an original dentition, previewing a change process of gradually transiting the occlusion relation of the upper and lower dentitions of the original dentition from a disordered state to a stable state on the virtual upper and lower jaw complex, automatically dividing the change process into a plurality of steps by a computer, and determining the stable occlusion state;
and screening a series of stable occlusion states obtained by the automatic detection of the computer to obtain the earliest stable middle occlusion state of the upper dentition and the lower dentition reaching the operation time.
2. The computer-aided design method for deciding the timing of orthodontic orthognathic combination therapy according to claim 1, wherein the determining three-dimensional holographic skull data according to the three-dimensional data comprises:
obtaining crown data from the plaster model/intraoral scan data of the dentition;
obtaining tooth root and jaw data through skull CBCT data;
matching the dental crown data with the dental roots and the jaw data through a coordinate system and performing matrix transformation, and performing data fusion on each dental crown data and the corresponding dental roots to generate stl data;
and subtracting redundant data in the stl data to obtain three-dimensional holographic skull data containing facial bones, teeth and tooth roots.
3. The computer-aided design method for deciding the timing of orthodontic and orthognathic combined treatment operation according to claim 1, wherein virtual preoperative orthodontics are performed on alveolar bone with information of crown and root of tooth according to the three-dimensional holographic skull data, which comprises the following steps:
orthodontic tooth arrangement is respectively carried out on the upper dentition and the lower dentition, and secondary tooth axis inclination caused by abnormal positions of upper and lower jawbones is eliminated;
wherein, the step of orthodontic tooth arrangement specifically includes:
and moving teeth in the alveolar bone, setting a rotation center, and performing translation and rotation to finally achieve the results that the teeth are arranged neatly, the dentition is flat and the teeth are positioned in the middle of the alveolar bone.
4. The computer-aided design method for deciding the surgical occasion of orthodontic orthognathic combination therapy according to claim 1, wherein the correct positional relationship between the maxilla and mandible and dentition comprises:
the covering jaw of the upper and lower dentition is normally covered, the upper cuspid is occluded between the lower cuspid and the lower first premolar, the included angle between the upper gullet seat point, the lower gullet seat point and the nasal root point is 2-4 degrees, and the bone structure is bilaterally symmetrical.
5. The computer-aided design method for deciding the surgical time of orthodontic orthognathic combination therapy according to claim 4, wherein the correct positional relationship between the maxilla and mandible and the dentition further comprises:
the upper middle incisor cut end is within 1/3 of the lower middle incisor cut in the vertical direction, and the upper front incisor cut end is within 3mm in front of the lower incisor cut end.
6. The computer-aided design method for deciding the timing of an orthodontic orthognathic combination treatment operation according to claim 1, wherein the step of replacing the virtual orthodontic rear dentition in the virtual upper-lower jaw complex with the original dentition is preceded by the step of:
the Boolean geometric datum point is set as a basis to ensure that the matrix relation between the dentition coordinate system and the jaw bone coordinate system is kept unchanged.
7. The computer-aided design method for deciding the timing of orthodontic orthognathic combination therapy according to claim 1, wherein the variation process of gradually transiting the occlusion relationship of upper and lower dentitions of the original dentition from the disordered state to the stable state is performed on the virtual upper and lower jaw complex, and the variation process is automatically divided into a plurality of steps by a computer, which specifically comprises:
in the process of previewing the change process that the occlusion relation of the upper dentition and the lower dentition of the original dentition is gradually transited from a disordered state to a stable state, the computer automatically divides the change process into dozens of steps, and the virtual preoperative orthodontic process is carried out step by step according to the movement amount of each step of teeth, so that the whole process of the tooth root is ensured to be positioned in the alveolar bone.
8. The computer-aided design method for deciding the surgical time of orthodontic orthognathic combined treatment according to claim 1, wherein the method for screening a series of stable occlusal states obtained by the automatic detection of the computer to obtain the earliest stable intermediate occlusal state of the upper and lower dentitions for reaching the surgical time specifically comprises:
screening a series of stable occlusion states obtained by automatic detection of a computer by an orthognathic surgeon and an orthodontist through a visual platform to obtain the earliest stable middle occlusion state of upper and lower dentitions;
and determining the earliest stable occlusion state of the upper and lower dentitions, which is identified by the orthognathic surgeon and the orthodontist, as the stable middle occlusion state of the upper and lower dentitions at the operation time.
9. The computer aided design method for deciding the surgical time of orthodontic orthognathic combination therapy according to claim 1, characterized in that the series of stable occlusion states automatically detected by the computer are:
the full dentition vector is superposed with the coordinate axis in the front-back direction of the coordinate system; the number of collision contact points of the full dentition is not less than 3, and the collision contact points are distributed bilaterally as much as possible.
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