CN117731424A - Dental arch curve generating method, dental arch curve generating system, dental arch curve generating computer device and dental arch curve generating readable storage medium - Google Patents
Dental arch curve generating method, dental arch curve generating system, dental arch curve generating computer device and dental arch curve generating readable storage medium Download PDFInfo
- Publication number
- CN117731424A CN117731424A CN202311756251.8A CN202311756251A CN117731424A CN 117731424 A CN117731424 A CN 117731424A CN 202311756251 A CN202311756251 A CN 202311756251A CN 117731424 A CN117731424 A CN 117731424A
- Authority
- CN
- China
- Prior art keywords
- convex hull
- tooth
- dental arch
- points
- arch curve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 210000002455 dental arch Anatomy 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000003860 storage Methods 0.000 title claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims description 15
- 238000004590 computer program Methods 0.000 claims description 11
- 230000003993 interaction Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000284 extract Substances 0.000 description 3
- 210000001847 jaw Anatomy 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000011960 computer-aided design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000007721 medicinal effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- PXFBZOLANLWPMH-UHFFFAOYSA-N 16-Epiaffinine Natural products C1C(C2=CC=CC=C2N2)=C2C(=O)CC2C(=CC)CN(C)C1C2CO PXFBZOLANLWPMH-UHFFFAOYSA-N 0.000 description 1
- 108010001267 Protein Subunits Proteins 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000004513 dentition Anatomy 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000036346 tooth eruption Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
The present application relates to a dental arch curve generating method, system, computer device and computer readable storage medium, wherein the method comprises: a tooth model obtaining step of obtaining three-dimensional data of a target tooth model through a three-dimensional scanner; a three-dimensional convex hull obtaining step, namely respectively calculating an upper tooth convex hull and a lower tooth convex hull by an incremental method based on the three-dimensional data; a three-dimensional model body construction step, namely carrying out Boolean intersection calculation based on the upper tooth convex hull and the lower tooth convex hull, and obtaining an intersection model body of the upper tooth convex hull and the lower tooth convex hull so as to represent an occlusion region part in a target tooth model; and generating a dental arch curve, namely projecting model points of the intersection model body to a two-dimensional plane, extracting tooth edge characteristic points of a projection result, and forming the dental arch curve by three-time Bezier curve interpolation of the tooth edge characteristic points. Through this application, reduce the loaded down with trivial details step that manual operation brought, improve orthodontic efficiency.
Description
Technical Field
The present application relates to the field of computer data processing, and in particular to a dental arch curve generating method, a system, a computer device and a computer readable storage medium.
Background
Compared with the traditional orthodontic means, the 3D digital orthodontic is used as a brand new digital correction technology, the 3D digital orthodontic is more accurate in correcting malformations such as malpositioned teeth and bucktooth, has the advantages of being more natural, shorter in correction time, free of rebound and the like, and is a brand new digital correction technology aiming at the tooth problem by combining modern stomatology, computer-aided three-dimensional diagnosis, computer-aided design, personalized scheme and digital forming technology.
Restoration and reconstruction of dentition morphology and function is a fundamental goal of orthodontic treatment. In traditional orthodontic technology, most acquire patient's tooth model through orthodontist or dental technician and carry out visual analysis, scan the model according to the definition of dental arch curve on patient's mouth and carry out manual mark, draw dental arch curve, and then generate the appliance according to dental arch curve, but through manual mark, draw dental arch curve complex operation and error are great, receive orthodontist and dental technician's subjectivity influence greatly, the accuracy is lower, can influence the formation of follow-up orthodontic scheme.
Along with the development of digital correction technology, the existing dental arch curve starts to adopt a generating method based on computer aided design, but at present, the dental arch curve is calculated based on an oral scanning model by manually selecting points in software to obtain a jaw plane, and then the target points are linked into the dental arch curve after the target points are selected. Although the marking and drawing of the dental arch curve based on software are convenient for manual operation, the jaw plane is generated by manually selecting a target point, the manual error still exists in the calculation of the jaw plane, and the manual operation efficiency still needs to be improved.
Therefore, the existing dental arch curve production method has the defects of complex operation, low working efficiency and higher professional and time cost requirements of manual operators (orthodontists and dental technicians), the dental arch curve results generated by the manual operators based on different dental arch curve rules are also different, the symmetry cannot be ensured by a partial click mode, the accuracy is lower, the correction effect is influenced, and the generated dental arch curve is inconvenient to intelligently optimize.
Disclosure of Invention
The embodiment of the application provides a dental arch curve generating method, a dental arch curve generating system, a computer device and a computer readable storage medium, so as to at least solve the problem of dental arch curve generating accuracy.
In a first aspect, an embodiment of the present application provides a dental arch curve generating method, including:
a tooth model obtaining step of obtaining three-dimensional data of a target tooth model through a three-dimensional scanner;
a three-dimensional convex hull obtaining step, namely respectively calculating an upper tooth convex hull and a lower tooth convex hull by an incremental method based on the three-dimensional data, wherein the upper tooth convex hull and the lower tooth convex hull are respectively point sets of the minimum convex polyhedron of the upper tooth and point sets of the minimum convex polyhedron of the lower tooth in the three-dimensional data;
a three-dimensional model body construction step, namely, carrying out Boolean intersection calculation based on the upper tooth convex hull and the lower tooth convex hull, and obtaining an intersection model body of the upper tooth convex hull and the lower tooth convex hull so as to represent an occlusion area part in a target tooth model, wherein the model body is a three-dimensional model body similar to a semicircle;
and generating a dental arch curve, namely projecting model points of the intersection model body to a two-dimensional plane, extracting tooth edge characteristic points of a projection result, and interpolating the tooth edge characteristic points through a cubic Bezier curve (Bezier curve) to form the dental arch curve.
In some embodiments, the step of obtaining the three-dimensional convex hull includes the following steps:
an initial convex hull selecting step, namely selecting a plurality of initial points in the three-dimensional data to form an initial convex hull;
and an initial convex hull updating step, namely circularly traversing points in the three-dimensional data, screening data points positioned outside the initial convex hull, updating the initial convex hull based on the data points, and obtaining an updated three-dimensional convex hull until the points in the three-dimensional data are traversed. Specifically, a data point located outside the initial convex hull is found, a point which is farthest from the point in the initial convex hull is determined, a convex hull point contained between the two points is connected with a newly added P point, and newly formed points, edges and faces are used as new convex hull elements, so that an updated convex hull is obtained.
In some embodiments, the extracting the tooth edge feature points in the dental arch curve generating step specifically includes:
acquiring a point set V of the outermost ring in the projection result;
and calculating an angle theta between adjacent points in the point set V, and screening the outermost points with the angle theta not being 0 as tooth edge characteristic points to be extracted. The angle θ may be calculated based on the following calculation model:
θ=arctan ((y2—y1)/(x 2—x1)) used to represent the angle formed by two adjacent points, point a (x 1, y 1), point B (x 2, y 2), from any point through which a ray passes.
In some embodiments, the extracting the tooth edge feature points in the dental arch curve generating step specifically includes:
acquiring a point set V of the outermost ring in the projection result;
calculating an angle theta between adjacent points in the point set V, and screening points with the angle theta not being 0 as preselected tooth edge characteristic points;
acquiring the tooth position of each tooth in the three-dimensional data;
and screening the preselected tooth edge characteristic points corresponding to the tooth positions, taking the preselected tooth edge characteristic points at the middle points of the tooth positions as the tooth edge characteristic points to be extracted so as to adapt to the orthodontic requirement of taking the middle points of the teeth to form an arch curve, and expanding the application scene of the method.
In some of these embodiments, the cubic bezier curve interpolation in the dental arch curve generating step may be calculated based on the following calculation model:
B(t)＝(1-t) 3 *P 0 +3*(1-t) 2 *t*P 1 +3*(1-t)*t 2 *P 2 +t 3 *P 3 ，
wherein t is more than or equal to 0 and less than or equal to 1, and P 0 、P 1 、P 2 、P 3 And the control points are selected adjacent points from the tooth edge characteristic points and are used for adjusting the smoothness between the adjacent tooth edge characteristic points.
In some embodiments, the control point is configured to drag or edit based on a human-computer interaction interface, and in particular, editing operations include, but are not limited to, inserting, deleting, inputting adjustment parameters to perform displacement, so that a professional such as an orthodontist, a dental technician and the like can further optimize the dental arch curve to form a specific and attractive dental arch curve more conforming to a target object.
In a second aspect, embodiments of the present application provide a dental arch curve generating system, comprising:
the tooth model acquisition module is used for acquiring three-dimensional data of the target tooth model through a three-dimensional scanner;
the three-dimensional convex hull acquisition module is used for respectively calculating an upper tooth convex hull and a lower tooth convex hull by an incremental method based on the three-dimensional data, wherein the upper tooth convex hull and the lower tooth convex hull are respectively point sets of the minimum convex polyhedron of the upper tooth and point sets of the minimum convex polyhedron of the lower tooth in the three-dimensional data;
the three-dimensional model body construction module is used for carrying out Boolean intersection calculation based on the upper tooth convex hull and the lower tooth convex hull, and obtaining an intersection model body of the upper tooth convex hull and the lower tooth convex hull so as to represent an occlusion area part in a target tooth model, wherein the model body is a three-dimensional model body similar to a semicircle;
the dental arch curve generating module is used for projecting the model points of the intersection model body to a two-dimensional plane, extracting tooth edge characteristic points of projection results, and forming a dental arch curve through three-time Bezier curve interpolation on the tooth edge characteristic points.
In some embodiments, the upper tooth convex hull and the lower tooth convex hull in the three-dimensional convex hull obtaining module are obtained by executing the following units:
the initial convex hull selecting unit is used for selecting a plurality of initial points from the three-dimensional data to form an initial convex hull;
and the initial convex hull updating unit is used for circularly traversing the points in the three-dimensional data, screening data points positioned outside the initial convex hull, updating the initial convex hull based on the data points, and obtaining an updated three-dimensional convex hull until the points in the three-dimensional data are traversed. Specifically, a data point located outside the initial convex hull is found, a point which is farthest from the point in the initial convex hull is determined, a convex hull point contained between the two points is connected with a newly added P point, and newly formed points, edges and faces are used as new convex hull elements, so that an updated convex hull is obtained.
In a third aspect, an embodiment of the present application provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the dental arch curve generating method according to the first aspect described above when executing the computer program.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a dental arch curve generating method as described in the first aspect above.
Compared with the related art, the dental arch curve generating method, the system, the computer equipment and the computer readable storage medium provided by the embodiment of the application automatically acquire the characteristic points for the dental arch curve through geometric processing of the mouth sweeping model, automatically generate the corresponding dental arch curve through Bezier interpolation, reduce complicated steps brought by manual operation, improve orthodontic efficiency, acquire the dental arch curve which accords with the attractiveness, the accuracy and individuation better, and provide effective data support and guidance for the dental correction scheme.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a flow chart of a dental arch curve generation method according to an embodiment of the present application;
FIG. 2 is a flow chart of the substeps of a dental arch curve generation method according to an embodiment of the present application;
FIG. 3 is a block diagram of a dental arch curve generating system according to an embodiment of the present application;
FIG. 4 is a schematic illustration of bite area references according to an embodiment of the present application;
FIG. 5 is another reference schematic view of a bite region according to an embodiment of the present application;
FIG. 6 is a schematic view of dental arch curve feature points according to an embodiment of the present application;
fig. 7 is a schematic view of an optimized dental arch according to an embodiment of the present application.
In the figure:
1. a tooth model acquisition module; 2. the three-dimensional convex hull acquisition module; 3. a three-dimensional model body construction module;
4. a dental arch curve generation module;
201. an initial convex hull selection unit; 202. and an initial convex hull updating unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described and illustrated below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments provided herein, are intended to be within the scope of the present application.
It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is possible for those of ordinary skill in the art to apply the present application to other similar situations according to these drawings without inventive effort. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the embodiments described herein can be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar terms herein do not denote a limitation of quantity, but rather denote the singular or plural. The terms "comprising," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein refers to two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The terms "first," "second," "third," and the like, as used herein, are merely distinguishing between similar objects and not representing a particular ordering of objects.
The geometric meaning of a convex hull is a convex combination of all elements within a set, also equivalent to the intersection of all convex sets containing the set elements, i.e., for a finite set { v1, v2, …, vn }, its convex hull (or called affine hull) is specifically represented asi is an arbitrary natural number.
The three-dimensional convex hull is a convex hull formed by the smallest convex polyhedron of points in a given three-dimensional space.
The embodiment provides a dental arch curve generating method. Fig. 1-2 are flowcharts of a dental arch curve generating method according to an embodiment of the present application, as shown in fig. 1-2, the flowchart including the steps of:
a tooth model obtaining step S1, wherein three-dimensional data of a target tooth model is obtained through a three-dimensional scanner;
a three-dimensional convex hull obtaining step S2, namely respectively calculating an upper tooth convex hull and a lower tooth convex hull based on the three-dimensional data by using an increment method, wherein the upper tooth convex hull and the lower tooth convex hull are respectively point sets of the minimum convex polyhedron of the upper tooth and point sets of the minimum convex polyhedron of the lower tooth in the three-dimensional data, and are respectively marked as Conv1 and Conv2; the upper tooth convex hull and the lower tooth convex hull in the three-dimensional convex hull obtaining step S2 are obtained through the following steps:
an initial convex hull selecting step S201, wherein a plurality of initial points are selected from the three-dimensional data to form an initial convex hull, and three initial points are selected in the embodiment of the present application and are respectively marked as P1, P2, P3, (P1, P2, P3) and two planes formed by (P3, P2, P1) form the initial convex hull, and two opposite surfaces form a convex hull with a volume of 0;
and an initial convex hull updating step S202, namely circularly traversing points in the three-dimensional data, screening data points positioned outside the initial convex hull, updating the initial convex hull based on the data points, and obtaining an updated three-dimensional convex hull until the points in the three-dimensional data are traversed. Specifically, a data point located outside the initial convex hull is found, a point which is farthest from the point in the initial convex hull is determined, a convex hull point contained between the two points is connected with a newly added P point, and newly formed points, edges and faces are used as new convex hull elements, so that an updated convex hull is obtained. For example, but not limited to, a ray method may be used to determine whether a current point is located outside the initial convex hull, and when the number of intersection points between the ray and the edge point of the initial convex hull is odd, the current point is determined to be inside the initial convex hull, and if the number of intersection points is even, the current point is determined to be outside the initial convex hull.
According to the method, when the upper tooth convex hull is calculated, calculation is performed based on initial points and data points corresponding to upper teeth in three-dimensional data, when the lower tooth convex hull is calculated, calculation is performed based on initial points and data points corresponding to lower teeth in three-dimensional data, and the upper tooth convex hull and the lower tooth convex hull are obtained through the initial convex hull selection step and the initial convex hull update step respectively.
A three-dimensional model body constructing step S3, performing boolean intersection calculation based on the upper tooth convex hull and the lower tooth convex hull, to obtain an intersection model body of the upper tooth convex hull and the lower tooth convex hull, as shown by a region a in fig. 4, to represent an occlusion region part in the target tooth model, where the model body is a three-dimensional model body similar to a semicircle, and is denoted as V1 in conjunction with fig. 5;
and S4, projecting the model points of the intersection model body to a two-dimensional plane to form a single arc line, extracting tooth edge characteristic points of a projection result, and interpolating the tooth edge characteristic points through a cubic Bezier curve to form a dental arch curve, as shown in FIG. 6. The quadratic bezier curve is a linear interpolation of two quadratic bezier curves point-to-point for a given control point P 0 、P 1 、P 2 、P 3 Is a quadratic Bezier curve P 0 、P 1 Linear interpolation of P2 and quadratic bezier curves P1, P2, P3, based on which the dental arch curveThe cubic Bezier curve interpolation in the generating step can be calculated based on the following calculation model:
B(t)＝(1-t) 3 *P 0 +3*(1-t) 2 *t*P 1 +3*(1-t)*t 2 *P 2 +t 3 *P 3 ，
wherein t is more than or equal to 0 and less than or equal to 1, and P 0 、P 1 、P 2 、P 3 The control points are selected from the tooth edge feature points and used for adjusting the smoothness between the adjacent tooth edge feature points, and it should be noted that the complete dental arch curve may be a three-time bezier curve for the segmentation of the curve or a three-time bezier curve for the whole curve, so as to form at least four control points.
In some embodiments, the extracting the tooth edge feature points in the dental arch curve generating step 4 specifically includes:
acquiring a point set V of the outermost ring in the projection result;
and calculating an angle theta between adjacent points in the point set V, and screening the outermost points with the angle theta not being 0 as tooth edge characteristic points to be extracted. The angle θ may be calculated based on the following calculation model: θ=arctan ((y2—y1)/(x 2—x1)) used to represent the angle formed by two adjacent points, point a (x 1, y 1), point B (x 2, y 2), from any point through which a ray passes. Based on this, the embodiment of the application selects the point of the tooth outside (namely the point of the outermost ring) as the tooth edge characteristic point to form the dental arch curve, on one hand, the mode can accurately select the peripheral area of the occlusal area through calculation, can intelligently adjust the selected area, on the other hand, the point of the outermost ring is selected to enable the tooth edge characteristic point of the application to represent more types of teeth to be corrected, such as dislocation teeth, bucktooth teeth and the like, so that the generated dental arch curve is more accurate, and the correction applicability is wider.
In another embodiment, the extracting the tooth edge feature points in the dental arch curve generating step S4 specifically includes:
acquiring a point set V of the outermost ring in the projection result;
calculating an angle theta between adjacent points in the point set V, and screening points with the angle theta not being 0 as preselected tooth edge characteristic points;
acquiring the tooth position of each tooth in the three-dimensional data;
and screening the preselected tooth edge characteristic points corresponding to the tooth positions, taking the preselected tooth edge characteristic points at the middle points of the tooth positions as the tooth edge characteristic points to be extracted so as to adapt to the orthodontic requirement of taking the middle points of the teeth to form an arch curve, and expanding the application scene of the method.
Based on the steps, the dental arch curve generating method of the embodiment of the application carries out geometric processing calculation based on the three-dimensional data of the tooth model of the target object to obtain the occlusion region, extracts the characteristic points according to the two-dimensional projection of the occlusion region to generate the dental arch curve, and simultaneously improves the attractiveness and the medical property of the dental arch curve through fitting optimization, so that the dental arch curve can be generated without manual operation, the working time cost is greatly reduced, the orthodontic working efficiency is improved, the calculation process can carry out automatic accurate calculation based on the three-dimensional data, the calculation accuracy is improved, and meanwhile, the dental arch curve is not subjectively influenced by manual experience, so that the generated dental arch curve is more objective and has controllability.
In some embodiments, the control point is configured to drag or edit based on a human-computer interaction interface, specifically, editing operations include, but are not limited to, inserting, deleting, inputting adjustment parameters to perform displacement, so that a professional such as an orthodontist, a dental technician, etc. further optimizes the dental arch curve to form a specific and more attractive dental arch curve more conforming to the target object, as shown in fig. 7.
Based on the steps, although the artificial operation is added for assistance, the dental arch curve generating method of the embodiment of the application does not increase excessive labor cost, personalized optimization is realized, the correction effect is more accurate, and through multiple data tests, the dental arch curve generating method of the embodiment of the application realizes the effects of high efficiency, strong robustness and high accuracy.
It should be noted that the steps illustrated in the above-described flow or flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and that, although a logical order is illustrated in the flow diagrams, in some cases, the steps illustrated or described may be performed in an order other than that illustrated herein.
The present embodiment also provides a dental arch curve generating system, which is used for implementing the foregoing embodiments and preferred embodiments, and will not be described in detail. As used below, the terms "module," "unit," "sub-unit," and the like may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
Fig. 3 is a block diagram of a dental arch curve generating system according to an embodiment of the present application, as shown in fig. 3, the system comprising:
the tooth model acquisition module 1 is used for acquiring three-dimensional data of a target tooth model through a three-dimensional scanner;
the three-dimensional convex hull acquisition module 2 is used for respectively calculating an upper tooth convex hull and a lower tooth convex hull by an incremental method based on the three-dimensional data, wherein the upper tooth convex hull and the lower tooth convex hull are respectively point sets of minimum convex polyhedrons of upper teeth and point sets of minimum convex polyhedrons of lower teeth in the three-dimensional data, and are respectively marked as Conv1 and Conv2, and the convex hull effect is shown in fig. 4; the upper tooth convex hull and the lower tooth convex hull in the three-dimensional convex hull acquisition module 2 are obtained by executing the following units:
an initial convex hull selecting unit 201, configured to select a plurality of initial points from the three-dimensional data to form an initial convex hull, where three initial points are respectively denoted as P1, P2, and P3, (P1, P2, P3) and two planes formed by (P3, P2, and P1) form the initial convex hull, and two opposite surfaces form a convex hull with a volume of 0;
and the initial convex hull updating unit 202 is used for circularly traversing the points in the three-dimensional data, screening the data points positioned outside the initial convex hull, updating the initial convex hull based on the data points, and obtaining an updated three-dimensional convex hull until the points in the three-dimensional data are traversed. Specifically, a data point located outside the initial convex hull is found, a point which is farthest from the point in the initial convex hull is determined, a convex hull point contained between the two points is connected with a newly added P point, and newly formed points, edges and faces are used as new convex hull elements, so that an updated convex hull is obtained. For example, but not limited to, a ray method may be used to determine whether a current point is located outside the initial convex hull, and when the number of intersection points between the ray and the edge point of the initial convex hull is odd, the current point is determined to be inside the initial convex hull, and if the number of intersection points is even, the current point is determined to be outside the initial convex hull.
A three-dimensional model body construction module 3, configured to perform boolean intersection calculation based on the upper dental convex hull and the lower dental convex hull, and obtain an intersection model body of the upper dental convex hull and the lower dental convex hull, so as to represent an occlusion region portion in the target dental model, where the model body is a three-dimensional model body similar to a semicircle, as shown in fig. 5, and denoted by V1;
the dental arch curve generating module 4 is configured to project the model points of the intersection model body onto a two-dimensional plane to form a one-dimensional arc line, extract tooth edge feature points of the projection result, and interpolate the tooth edge feature points by using cubic bezier curves to form dental arch curves, as shown in fig. 6. The extraction process of the tooth edge feature points is the same as that of the above embodiment, and will not be described here again.
Based on the structure, the dental arch curve generating system of the embodiment of the application performs geometric processing calculation based on the three-dimensional data of the tooth model of the target object to obtain the occlusion region, extracts the characteristic points according to the two-dimensional projection of the occlusion region to generate the dental arch curve, and simultaneously improves the attractiveness and the medical property of the dental arch curve through fitting optimization, so that the dental arch curve can be generated without manual operation, the working time cost is greatly reduced, the orthodontic working efficiency is improved, the calculation process can be automatically and accurately calculated based on the three-dimensional data, the calculation accuracy is improved, meanwhile, the subjective influence of manual experience is avoided, and the generated dental arch curve is more objective and controllable.
The above-described respective modules may be functional modules or program modules, and may be implemented by software or hardware. For modules implemented in hardware, the various modules described above may be located in the same processor; or the above modules may be located in different processors in any combination.
In addition, the dental arch curve generating method of the embodiment of the present application described in connection with fig. 1 may be implemented by a computer device. The computer device may include a processor and a memory storing computer program instructions.
In particular, the processor may include a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, abbreviated as ASIC), or may be configured to implement one or more integrated circuits of embodiments of the present application.
The memory may include, among other things, mass storage for data or instructions. By way of example, and not limitation, the memory may comprise a Hard Disk Drive (HDD), floppy Disk Drive, solid state Drive (Solid State Drive, SSD), flash memory, optical Disk, magneto-optical Disk, tape, or universal serial bus (Universal Serial Bus, USB) Drive, or a combination of two or more of the foregoing. The memory may include removable or non-removable (or fixed) media, where appropriate. The memory may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory is a Non-Volatile (Non-Volatile) memory. In particular embodiments, the Memory includes Read-Only Memory (ROM) and random access Memory (Random Access Memory, RAM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (Programmable Read-Only Memory, abbreviated PROM), an erasable PROM (Erasable Programmable Read-Only Memory, abbreviated EPROM), an electrically erasable PROM (Electrically Erasable Programmable Read-Only Memory, abbreviated EEPROM), an electrically rewritable ROM (Electrically Alterable Read-Only Memory, abbreviated EAROM), or a FLASH Memory (FLASH), or a combination of two or more of these. The RAM may be Static Random-Access Memory (SRAM) or dynamic Random-Access Memory (Dynamic Random Access Memory DRAM), where the DRAM may be a fast page mode dynamic Random-Access Memory (Fast Page Mode Dynamic Random Access Memory FPMDRAM), extended data output dynamic Random-Access Memory (Extended Date Out Dynamic Random Access Memory EDODRAM), synchronous dynamic Random-Access Memory (Synchronous Dynamic Random-Access Memory SDRAM), or the like, as appropriate.
The memory may be used to store or cache various data files that need to be processed and/or communicated, as well as possible computer program instructions for execution by the processor.
The processor reads and executes the computer program instructions stored in the memory to implement any of the dental arch curve generating methods of the above embodiments.
The computer device can execute the dental arch curve generating method in the embodiment of the application based on the three-dimensional data acquired by the acquired mouth scan target object of the three-dimensional scanner, so as to realize the dental arch curve generating method described in connection with fig. 1-2.
In addition, in combination with the dental arch curve generating method in the above embodiments, embodiments of the present application may provide a computer-readable storage medium. The computer readable storage medium has stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement any of the dental arch curve generating methods of the above embodiments.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A dental arch curve generating method, comprising:
a tooth model obtaining step of obtaining three-dimensional data of a target tooth model through a three-dimensional scanner;
a three-dimensional convex hull obtaining step, namely respectively calculating an upper tooth convex hull and a lower tooth convex hull based on the three-dimensional data, wherein the upper tooth convex hull and the lower tooth convex hull are respectively point sets of minimum convex polyhedrons of upper teeth and point sets of minimum convex polyhedrons of lower teeth in the three-dimensional data;
a three-dimensional model body construction step, namely carrying out Boolean intersection calculation based on the upper tooth convex hull and the lower tooth convex hull, and obtaining an intersection model body of the upper tooth convex hull and the lower tooth convex hull so as to represent an occlusion region part in a target tooth model;
and generating a dental arch curve, namely projecting model points of the intersection model body to a two-dimensional plane, extracting tooth edge characteristic points of a projection result, and forming the dental arch curve by three-time Bezier curve interpolation of the tooth edge characteristic points.
2. The dental arch curve generating method according to claim 1, wherein in the three-dimensional convex hull obtaining step, both the upper dental convex hull and the lower dental convex hull are obtained by:
an initial convex hull selecting step, namely selecting a plurality of initial points in the three-dimensional data to form an initial convex hull;
and updating the initial convex hull, namely circularly traversing points in the three-dimensional data, screening data points positioned outside the initial convex hull, and updating the initial convex hull based on the data points to obtain an updated three-dimensional convex hull.
3. The dental arch curve generating method according to claim 1, wherein the extracting of the tooth edge feature points in the dental arch curve generating step specifically includes:
acquiring a point set V of the outermost ring in the projection result;
and calculating an angle theta between adjacent points in the point set V, and screening the outermost points with the angle theta not being 0 as tooth edge characteristic points to be extracted.
4. The dental arch curve generating method according to claim 1, wherein the extracting of the tooth edge feature points in the dental arch curve generating step specifically includes:
acquiring a point set V of the outermost ring in the projection result;
calculating an angle theta between adjacent points in the point set V, and screening points with the angle theta not being 0 as preselected tooth edge characteristic points;
acquiring the tooth position of each tooth in the three-dimensional data;
and screening the preselected tooth edge characteristic points corresponding to the tooth positions, and taking the preselected tooth edge characteristic points at the midpoints of the tooth positions as tooth edge characteristic points to be extracted.
5. The dental arch curve generating method according to claim 3 or 4, wherein the cubic bezier curve interpolation in the dental arch curve generating step is calculated based on the following calculation model:
B(t)＝(1-t) 3 *P 0 +3*(1-t) 2 *t*P 1 +3*(1-t)*t 2 *P 2 +t 3 *P 3 ，
wherein t is more than or equal to 0 and less than or equal to 1, and P 0 、P 1 、P 2 、P 3 Is used as a control point for adjusting the smoothness between the edge characteristic points of adjacent teeth.
6. The dental arch curve generating method of claim 5, wherein the control point is configured to drag or edit based on a human-machine interaction interface.
7. A dental arch curve generating system, comprising:
the tooth model acquisition module is used for acquiring three-dimensional data of the target tooth model through a three-dimensional scanner;
the three-dimensional convex hull acquisition module is used for respectively calculating an upper tooth convex hull and a lower tooth convex hull based on the three-dimensional data, wherein the upper tooth convex hull and the lower tooth convex hull are respectively point sets of minimum convex polyhedrons of upper teeth and point sets of minimum convex polyhedrons of lower teeth in the three-dimensional data;
the three-dimensional model body construction module is used for carrying out Boolean intersection calculation based on the upper tooth convex hull and the lower tooth convex hull, and obtaining an intersection model body of the upper tooth convex hull and the lower tooth convex hull so as to represent an occlusion area part in the target tooth model;
the dental arch curve generating module is used for projecting the model points of the intersection model body to a two-dimensional plane, extracting tooth edge characteristic points of projection results, and forming a dental arch curve through three-time Bezier curve interpolation on the tooth edge characteristic points.
8. The dental arch curve generating system of claim 7, wherein the upper dental convex hull and the lower dental convex hull in the three-dimensional convex hull acquisition module are each obtained by performing the following units:
the initial convex hull selecting unit is used for selecting a plurality of initial points from the three-dimensional data to form an initial convex hull;
and the initial convex hull updating unit is used for circularly traversing points in the three-dimensional data, screening data points positioned outside the initial convex hull, and updating the initial convex hull based on the data points to obtain an updated three-dimensional convex hull.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the dental arch curve generating method according to any one of claims 1 to 6 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the dental arch curve generating method according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311756251.8A CN117731424A (en) | 2023-12-19 | 2023-12-19 | Dental arch curve generating method, dental arch curve generating system, dental arch curve generating computer device and dental arch curve generating readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311756251.8A CN117731424A (en) | 2023-12-19 | 2023-12-19 | Dental arch curve generating method, dental arch curve generating system, dental arch curve generating computer device and dental arch curve generating readable storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117731424A true CN117731424A (en) | 2024-03-22 |
Family
ID=90255968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311756251.8A Pending CN117731424A (en) | 2023-12-19 | 2023-12-19 | Dental arch curve generating method, dental arch curve generating system, dental arch curve generating computer device and dental arch curve generating readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117731424A (en) |
-
2023
- 2023-12-19 CN CN202311756251.8A patent/CN117731424A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11642195B2 (en) | Visual presentation of gingival line generated based on 3D tooth model | |
| US10945813B2 (en) | Providing a simulated outcome of dental treatment on a patient | |
| CN105447908B (en) | Dental arch model generation method based on oral cavity scan data and CBCT data | |
| US8401826B2 (en) | System and method for representation, modeling and application of three-dimensional digital pontics | |
| KR20210088946A (en) | Apparatus and method for generating 3d model using data matching | |
| KR102292872B1 (en) | Method for designing prosthetic material and apparatus thereof | |
| CN110916821A (en) | Preparation method of invisible appliance based on 3D printing | |
| CN113171188A (en) | Digital dental model construction method and system with hard palate area | |
| CN114329964A (en) | Filling concave state optimization method and device for tooth digital model | |
| US20240028782A1 (en) | Dental restoration automation | |
| CN107689077B (en) | Digital generation method of full-crown bridge body | |
| CN117731424A (en) | Dental arch curve generating method, dental arch curve generating system, dental arch curve generating computer device and dental arch curve generating readable storage medium | |
| CN111524065A (en) | Dental crown-based automatic generation method for individual implant abutment | |
| CN116749522A (en) | 3D printing system and method for orthodontic correction tool | |
| WO2022258603A1 (en) | Filling a mesh hole | |
| CN116012529B (en) | Virtual root generating method, device, computer equipment and storage medium | |
| KR102549576B1 (en) | Apparatus for designing dental prosthesis and method thereof | |
| US20230281840A1 (en) | Automated method for aligning three dimensional dental library model to three dimensional oral scan data and computer readable medium having program for performing the method | |
| EP4239577A1 (en) | Automated method for aligning three dimensional dental library model to three dimensional oral scan data and computer readable medium having program for performing the method | |
| KR102169967B1 (en) | Method for producing a transparent orthodontic model | |
| CN117379197A (en) | Tooth and dentition model generation method, scheme formulation method, equipment and medium | |
| WO2023094866A1 (en) | Anatomy driven computer-aided design and manufacture of dental restorations for treatment of dental pathologies | |
| KR20230161625A (en) | A computer program for executing a 3D prosthesis fabrication service for dental restorations | |
| KR20230161623A (en) | Method and system for manufacturing dental prosthesis | |
| KR20230161626A (en) | Recording medium recording a program for generating a dental prosthesis model |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |