CN106228616B - The method of corona adjacent surface is repaired in a kind of three-dimensional tooth model - Google Patents
The method of corona adjacent surface is repaired in a kind of three-dimensional tooth model Download PDFInfo
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- CN106228616B CN106228616B CN201610569916.8A CN201610569916A CN106228616B CN 106228616 B CN106228616 B CN 106228616B CN 201610569916 A CN201610569916 A CN 201610569916A CN 106228616 B CN106228616 B CN 106228616B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T19/00—Manipulating 3D models or images for computer graphics
- G06T19/20—Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2219/00—Indexing scheme for manipulating 3D models or images for computer graphics
- G06T2219/008—Cut plane or projection plane definition
Abstract
The invention discloses a kind of methods that corona adjacent surface is repaired in three-dimensional tooth model, comprising: tooth model boundary point set is extracted from database；The left and right adjacent surface boundary point set for extracting tooth model is concentrated in boundary point；Successively be directed to left margin and right margin, execute following steps: the interpolation point at a certain distance between the first and last endpoint of left margin or right margin obtains closed loop boundary point set；Closed loop boundary mass center is calculated, closed loop boundary point set is made to gather interpolation point set V to mass center；Triangular facet set is generated to closed loop boundary point set and point set V；Tooth model mass center is calculated, the position point set V is adjusted with the mass center, is allowed to be consistent with the curvature trend of tooth model.The adjacent teeth proximal contact relationship of energy precise restoration of the present invention excalation due to tooth slicing operation.
Description
Technical field
The present invention relates to computer application fields, more particularly to the method for repairing corona adjacent surface.
Background technique
The tooth model that patient is scanned by 3D, obtains the three-dimensional tooth model file that can be shown in a computer.It is adjacent
It is by the computer software of profession, to each the three-dimensional tooth corona model proximal surface lack part obtained after cutting that face, which is repaired,
The operation rebuild.It is repaired by corona proximal surface, to can be with the phase of precise restoration excalation due to tooth slicing operation
Adjacent teeth tooth proximal contact relationship rescues scheme for next step design and provides accurate patient teeth's threedimensional model.
But lack effective, accurate corona proximal surface method for repairing and mending at present, can not precise restoration due to tooth slicing operation
The adjacent teeth proximal contact relationship of excalation, to also just be difficult for rescuing offer foundation in next step.
Summary of the invention
It is an object of the invention to repair the method for corona adjacent surface in a kind of three-dimensional tooth model, energy precise restoration is because of tooth
The adjacent teeth proximal contact relationship of tooth slicing operation and excalation.
Realizing the technical solution of above-mentioned purpose is:
The method of corona adjacent surface is repaired in a kind of three-dimensional tooth model, comprising:
Tooth model boundary point set is extracted from database；
The left and right adjacent surface boundary point set for extracting tooth model is concentrated in boundary point；
It is successively directed to left margin and right margin, executes following steps:
The interpolation point at a certain distance between the first and last endpoint of left margin or right margin obtains closed loop boundary point set；
Closed loop boundary mass center is calculated, closed loop boundary point set is made to gather interpolation point set V to mass center；
Triangular facet set is generated to closed loop boundary point set and point set V；
Tooth model mass center is calculated, the position point set V is adjusted with the mass center, is allowed to keep one with the curvature trend of tooth model
It causes.
In the method for repairing corona adjacent surface in above-mentioned three-dimensional tooth model, the generation method of the interpolation point are as follows:
Calculate the vector n 1/ of end point e to first point s | n1 |, interpolation point is generated by formula p=e+i*n1*delta, wherein
Delta is interpolation distance, i=1, if ep distance is less than es distance, i=i+1；Otherwise, stop interpolation.
In the method for repairing corona adjacent surface in above-mentioned three-dimensional tooth model, described gathers interpolation method are as follows:
Closed loop boundary point set Pi (i=0 ... n) mass center o is calculated, for closed loop point P0, the P0 that sets up an office is last point, headed by mass center o
Point, using interpolation point generation method interpolation；I=i+1 repeats above step to i=n.
In the method for repairing corona adjacent surface in above-mentioned three-dimensional tooth model, the position side of the adjustment point set V
Method:
Closed loop boundary point collection central point O2 is calculated, point set Vi (i=0 ... N) is calculated separately and arrives the distance di of O2, and calculate
The average value ave of 1/di, updating point is Vi=O1+k*n2*di/ave, and wherein k is adjustment factor, and n2 is that tooth model mass center arrives
The vector of point Vi.
The beneficial effects of the present invention are: completion of the present invention is because of adjacent surface caused by tooth three-dimensional model slicing operation
Part, the precise restoration 3 D anatomical feature of every tooth, discharge tooth operation provide true user's tooth model, guarantee to set
Meter rescues scheme and appliance product and user's perfection fitting.
Detailed description of the invention
Fig. 1 is the flow chart that the method for corona adjacent surface is repaired in three-dimensional tooth model of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
Referring to Fig. 1, the method for repairing corona adjacent surface in three-dimensional tooth model of the invention, including the following steps:
Step S1 extracts tooth model boundary point set from database.
Step S2 concentrates the left and right adjacent surface boundary point set for extracting tooth model in boundary point.
It is successively directed to left margin and right margin, executes following steps:
Step S3, the interpolation point at a certain distance between the first and last endpoint of left margin or right margin obtain closed loop boundary point
Collection.Interpolation point generation method: the vector n 1/ of end point e to first point s is calculated | n1 |, (wherein by formula p=e+i*n1*delta
Delta is interpolation distance, is set as 0.2mm, i=1 herein) interpolation point is generated, if ep distance is less than es distance, i=i+1；It is no
Then, stop interpolation.
Step S4 calculates closed loop boundary mass center, closed loop boundary point set is made to gather interpolation point set V to mass center.Specifically gather
Interpolation method are as follows: calculate closed loop boundary point set Pi (i=0 ... n) mass center o, for closed loop point P0, the P0 that sets up an office is last point, mass center o
For first point, using interpolation point generation method interpolation；I=i+1 repeats above step to i=n.Then, past by closed loop boundary point
The mass center that boundary point set is formed gathers interpolation, and obtained point set is to gather interpolation point set.
Triangular facet set is generated to closed loop boundary point set and point set V, it may be assumed that according to existing delaunay triangulation methodology
It is carried out to open up benefit reconstruction, obtains triangle sets.
Step S5 calculates tooth model mass center O1, adjusts the position point set V with mass center O1, is allowed to the song with tooth model
Rate trend is consistent.Complete interproximal tooth coating repairing.Wherein, it adjusts the location method of point set V: calculating closed loop boundary point and concentrate
Heart point O2 calculates separately point set Vi (i=0 ... N) and arrives the distance di of O2, and calculates the average value ave of 1/di, and updating point is Vi
=O1+k*n2*di/ave, wherein k is adjustment factor, is set as the vector that 1.2, n2 is mass center O1 to point Vi herein.
Central point definition: traversal closed loop boundary point set Bi (i=0 ... t), central point=(B0+B1+ ... .+Bt)/t.
Mass center definition: traversal tooth model vertex Si (i=0 ... n), mass center=(S0+S1+ ... .+Sn)/n.
Above embodiments are used for illustrative purposes only, rather than limitation of the present invention, the technology people in relation to technical field
Member, without departing from the spirit and scope of the present invention, can also make various transformation or modification, therefore all equivalent
Technical solution also should belong to scope of the invention, should be limited by each claim.
Claims (4)
1. repairing the method for corona adjacent surface in a kind of three-dimensional tooth model characterized by comprising
Tooth model boundary point set is extracted from database；
The left and right adjacent surface boundary point set for extracting tooth model is concentrated in boundary point；
It is successively directed to left margin and right margin, executes following steps:
The interpolation point at a certain distance between the first and last endpoint of left margin or right margin obtains closed loop boundary point set；
Closed loop boundary mass center is calculated, closed loop boundary point set is made to gather interpolation point set V to mass center；
Triangular facet set is generated to closed loop boundary point set and point set V；
Tooth model mass center is calculated, the position point set V is adjusted with tooth model mass center, is allowed to keep with the curvature trend of tooth model
Unanimously.
2. repairing the method for corona adjacent surface in three-dimensional tooth model according to claim 1, which is characterized in that described to insert
It is worth the generation method of point are as follows:
Calculate the vector n 1/ of end point e to first point s | n1 |, interpolation point is generated by formula p=e+i*n1*del ta, wherein del ta
For interpolation distance, i=1, if ep distance is less than es distance, i=i+1；Otherwise, stop interpolation.
3. repairing the method for corona adjacent surface in three-dimensional tooth model according to claim 1, which is characterized in that gather slotting
Value method are as follows:
Closed loop boundary point set Pi mass center o, i=0 ... n is calculated, for closed loop point P0, the P0 that sets up an office is last point, and mass center o is first point, i
=1, using interpolation point generation method interpolation；I=i+1 repeats above step to i=n.
4. repairing the method for corona adjacent surface in three-dimensional tooth model according to claim 1, which is characterized in that described
Adjust the location method of point set V:
Closed loop boundary point collection central point O2 is calculated, calculates separately distance di, i=0 ... the N of point set Vi to O2, and calculate 1/di's
Average value ave, updating point is Vi=O1+k*n2*di/ave, and wherein k is adjustment factor, and n2 is tooth model mass center to point Vi's
Vector.
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| CN106228616B true CN106228616B (en) | 2019-04-30 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108567501B (en) * | 2017-03-14 | 2021-04-27 | 无锡时代天使医疗器械科技有限公司 | Reconstruction method of tooth adjacent surface |
| CN108670451B (en) * | 2018-05-04 | 2020-10-13 | 上海正雅齿科科技股份有限公司 | Method and device for repairing adjacent tooth surface, user terminal and storage medium |
| CN111563900B (en) * | 2020-04-01 | 2023-04-25 | 正雅齿科科技(上海)有限公司 | Method for repairing digital dental crown model and designing and preparing shell-shaped dental appliance |
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Effective date of registration: 20211109 Address after: 201800 3rd floor, No.5 factory building, Lane 615, Fengdeng Road, Malu Town, Jiading District, Shanghai Patentee after: Shanghai Emendi Material Technology Co.,Ltd. Address before: 201306 room 25077, area 1, building 1, No.888, Huanhu West 2nd Road, Nanhui new town, Pudong New Area, Shanghai Patentee before: SHANGHAI AISHENGMEI TECHNOLOGY CO.,LTD. |