Method, program, system and device for automatically generating personalized Spee curve based on tooth feature points

Abstract

The invention relates to a method for automatically generating a personalized Spee curve based on tooth feature points, and the method comprises the following steps: S1, obtaining tooth feature points, and adjusting control points to be symmetrically distributed in a Z direction along a midpoint; s2, constructing an equation fitting curve according to the tooth feature points; s3, deforming the fitted points by using a TPS deformation method; and S4, obtaining a personalized Spee curve. According to the method, the personalized Spee curve conforming to the tooth characteristics is fitted and generated according to the tooth tip point and tooth socket point information of the tooth, and meanwhile, the TPS conversion is used to fully retain the occlusion characteristic information, so that the fitted Spee curve passes through the characteristic points of the back tooth. According to the method, the obtained Spee curve can better conform to different tooth characteristics, manual adjustment of the Spee curve is reduced, the personalized Spee curve can be automatically generated according to the tooth characteristics of a patient, and consumption of manpower and material resources can be reduced to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of orthodontic design, and in particular to a method, program, system and device for automatically generating a personalized Spee curve based on tooth feature points. Background Art

[0002] The Spee curve is a set of upward concave curves connecting the incisal edge of the mandibular incisor, the apical space of the canine, the buccal cusp of the premolar, and the mesial and distal buccal cusps of the molar. The Spee curve is an important indicator in orthodontic treatment to measure the degree of tooth correction and plan the tooth arrangement plan.

[0003] This indicator usually appears in the correction process of deep overbite and other malocclusions, which will affect whether the plan requires tooth extraction. In the orthodontic process, the doctor will generally first adjust the patient's original Spee curve, formulate a new Spee curve shape after correction, and adjust the overbite and coverage of the teeth. In most orthodontic processes on the market, the process of adjusting the Spee curve requires the participation of the plan designer, which is time-consuming and labor-intensive.

[0004] Therefore, it is necessary to design a method and system that can automatically generate a personalized Spee curve based on the patient's own dental features. Summary of the invention

[0005] The technical problem to be solved by the present invention is to design a method, program, system and device for automatically generating a personalized Spee curve based on tooth feature points, thereby reducing manual adjustment of the Spee curve and reducing the consumption of manpower and material resources to a certain extent, thereby solving the existing technical problems.

[0006] In order to solve the above technical problems, the present invention provides a method for automatically generating a personalized Spee curve based on tooth feature points, comprising the following steps:

[0007] Step S1: Acquire tooth feature points and adjust the control points to be symmetrically distributed along the midpoint in the Z direction.

[0008] Step S2: construct an equation fitting curve based on the tooth feature points.

[0009] Step S3: Use the TPS deformation method to deform the fitted points.

[0010] Step S4: Obtain a personalized Spee curve.

[0011] Furthermore, in step S1, the tooth feature points include the central fossa of maxillary posterior teeth 5-8 and the cusp points of mandibular teeth 3-8. The feature points can be obtained by medical manual annotation or automatically obtained by AI.

[0012] Furthermore, step S2 specifically includes the following steps:

[0013] Step S21: construct an initial curve located on the jaw plane.

[0014] Step S22: Using the changes of the control points on the Y-axis and the Z-axis in step S1, construct a cubic equation and solve the equation.

[0015] Step S23: According to the equation solved in step S22, the Y-axis coordinates of the points of the curve to be fitted are taken as input one by one, and the Z-axis coordinates corresponding to the fitted curve points are updated to obtain a new fitted curve.

[0016] Furthermore, in step S21, a curve with Spee of 0, namely, an initial non-personalized Spee curve, is directly obtained and projected onto the upper and lower jaw planes as initial curve points to be fitted.

[0017] Furthermore, in step S22, the constructed cubic equation is in the form of:

[0018] z=ax 3 +by;

[0019] Construct z = ax 3 +by, the Vandermonde matrix has the following form:

[0020]

[0021] In the above formula, y is the change of the control point on the Y axis, and n represents the number of curve points that need to be fitted. Solving the above formula, we can get the values ​​of parameters a and b, and thus get the corresponding equation.

[0022] Furthermore, in step S3, the index of the point closest to the buccal cusp points of mandibular teeth No. 4 and No. 6 in the fitted curve point is located as the control point, the buccal cusp points of mandibular teeth No. 4 and No. 6 are used as the target points, and several points in the middle of the curve point and the first and last points are set as unchanged control points, and the fitted points are deformed using the TPS deformation method.

[0023] Furthermore, when TPS is deformed, the number of control points in the middle of the curve points selected as unchanged accounts for 1 / 10 of the total number of fitting curves.

[0024] The present invention also provides a system for automatically generating a personalized Spee curve based on tooth feature points, comprising:

[0025] Data acquisition module: used to obtain the characteristic points of teeth.

[0026] Curve fitting module: used for fitting and generating Spee curve, including an initial curve point acquisition unit, an equation construction and solving unit and a curve fitting unit; the initial curve point acquisition unit is used to construct an initial curve located in the jaw plane; the equation construction and solving unit is used to construct and solve equation parameters; the curve fitting unit is used to use the Y-axis coordinates of the curve points to be fitted as inputs one by one to obtain the equation, update the Z-axis coordinates corresponding to the curve points after fitting, so as to obtain a new curve after fitting.

[0027] TPS deformation module: used to deform the fitted points to form the final Spee curve.

[0028] The present invention also provides a device for automatically generating a personalized Spee curve based on tooth feature points, comprising:

[0029] at least one processor; and

[0030] at least one memory in communication with the processor;

[0031] The memory stores instructions executable by the processor, and the instructions are executed by the processor to enable the device to perform the aforementioned method for automatically generating a personalized Spee curve based on tooth feature points.

[0032] The present invention also provides a computer program product, comprising computer instructions, which, when executed by a processor, enable a computer device to execute the aforementioned method for automatically generating a personalized Spee curve based on tooth feature points.

[0033] Beneficial effects of the present invention:

[0034] The method for automatically generating a personalized Spee curve based on tooth feature points of the present invention fits and generates a personalized Spee curve that meets the tooth features according to the cusp point and the fossa point information of the tooth, and uses TPS transformation to fully retain the occlusal feature information so that the fitted Spee curve passes through the feature points of the posterior teeth. The Spee curve obtained by the method of the present invention can better meet the characteristics of different teeth, reduce the manual adjustment of the Spee curve, and can automatically generate a personalized Spee curve according to the patient's own tooth features, which can reduce the consumption of manpower and material resources to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The specific implementation of the present invention will be further explained below in conjunction with the accompanying drawings.

[0036] Figure 1 A flow chart of a method for automatically generating a personalized Spee curve based on tooth feature points of the present invention;

[0037] Figure 2Schematic diagram of tooth feature points in the present invention;

[0038] Figure 3 It is a flow chart of the method for constructing an equation fitting curve according to tooth feature points in the present invention;

[0039] Figure 4 is a schematic diagram of an initial curve constructed in the present invention;

[0040] Figure 5 It is a schematic diagram of the curve after fitting in the present invention;

[0041] Figure 6 is a schematic diagram of a curve after deformation in the present invention;

[0042] Figure 7 It is a comparison diagram of the overlapping curves in the present invention;

[0043] Figure 8 The block diagram of the system for automatically generating personalized Spee curves based on tooth feature points of the present invention. DETAILED DESCRIPTION

[0044] Example 1

[0045] Combination Figure 1 This embodiment provides a method for automatically generating a personalized Spee curve based on tooth feature points, comprising the following steps:

[0046] Step S1: Acquire tooth feature points and adjust the control points to be symmetrically distributed along the midpoint in the Z direction.

[0047] In this embodiment, in step S1, the tooth feature points include the central fossa of the maxillary posterior teeth 5-8 and the cusp points of the mandibular teeth 3-8, as shown in detail. Figure 2 As shown in the figure, feature points can be obtained by manual annotation in medicine or automatically through AI.

[0048] Step S2: construct an equation fitting curve based on the tooth feature points.

[0049] In this embodiment, preferably, Figure 3 As shown, step S2 specifically includes the following steps:

[0050] Step S21: construct an initial curve located on the jaw plane.

[0051] In this embodiment, preferably, in step S21, a curve with Spee of 0, i.e., an initial non-personalized Spee curve, is directly obtained and projected onto the upper and lower jaw planes as the initial curve points to be fitted (the initial fitting curve does not consider the characteristics of the teeth themselves, and the generated curve shape is basically the same regardless of the case), such as Figure 4 shown.

[0052] Step S22: Using the changes of the control points on the Y-axis and the Z-axis in step S1, construct a cubic equation and solve the equation.

[0053] In this embodiment, preferably, in step S22, the constructed cubic equation is in the form of:

[0054] z=ax 3 +by;

[0055] Construct z = ax 3 +by, the Vandermonde matrix has the following form:

[0056]

[0057] In the above formula, y is the change of the control point on the Y axis, and n represents the number of curve points that need to be fitted. Solving the above formula, we can get the values ​​of parameters a and b, and thus get the corresponding equation.

[0058] Step S23: According to the equation solved in step S22, the Y-axis coordinates of the points of the curve to be fitted are input one by one, and the Z-axis coordinates corresponding to the points of the fitted curve are updated to obtain a new fitted curve, such as Figure 5 shown.

[0059] The fitted curve only focuses on the characteristics of the teeth themselves. For some abnormal cases, the reverse Spee phenomenon may occur, which violates the medical orthodontic rules. Therefore, it is necessary to perform further operations according to the method shown in step S3.

[0060] Step S3: Use the TPS deformation method to deform the fitted points.

[0061] In this embodiment, preferably, in step S3, the index of the point closest to the buccal cusp points of mandibular teeth No. 4 and No. 6 in the fitted curve points is located as the control point, the buccal cusp points of mandibular teeth No. 4 and No. 6 are used as the target points, and several points in the middle of the curve points (10 points are selected in this embodiment) and the first and last points are set as unchanged control points, and the TPS deformation method is used to deform the fitted points. The deformed curve is as follows: Figure 6 shown.

[0062] In this embodiment, preferably, when the TPS is deformed, the number of the middle positions of the curve points selected as the unchanged control points accounts for 1 / 10 of the total number of fitting curves.

[0063] Step S4: Obtain a personalized Spee curve.

[0064] The curves overlap like Figure 7 As shown, Figure 6 The control curve in Figure 4The initial curve in step S3 pays more attention to the characteristics of the teeth themselves, so that the generated Spee curve is more consistent with the patient's own tooth shape, replacing the process of manually judging the shape of the Spee curve. At the same time, the operation in step S3 can further avoid the abnormal shape of the Spee curve and reduce the work of manual post-processing.

[0065] Example 2

[0066] Combination Figure 8 This embodiment provides a system for automatically generating a personalized Spee curve based on tooth feature points, including:

[0067] Data acquisition module: used to obtain the characteristic points of teeth.

[0068] Curve fitting module: used for fitting and generating Spee curve, including an initial curve point acquisition unit, an equation construction and solving unit and a curve fitting unit; the initial curve point acquisition unit is used to construct an initial curve located in the jaw plane; the equation construction and solving unit is used to construct and solve equation parameters; the curve fitting unit is used to use the Y-axis coordinates of the curve points to be fitted as inputs one by one to obtain the equation, update the Z-axis coordinates corresponding to the curve points after fitting, so as to obtain a new curve after fitting.

[0069] TPS deformation module: used to deform the fitted points to form the final Spee curve.

[0070] Example 3

[0071] This embodiment provides a device for automatically generating a personalized Spee curve based on tooth feature points, including:

[0072] at least one processor; and

[0073] at least one memory in communication with the processor;

[0074] The memory stores instructions that can be executed by the processor, and the instructions are executed by the processor to enable the device to perform the method of automatically generating a personalized Spee curve based on tooth feature points in Example 1.

[0075] Example 4

[0076] This embodiment provides a computer program product, including computer instructions, which, when executed by a processor, enable a computer device to execute the method for automatically generating a personalized Spee curve based on tooth feature points in Embodiment 1.

[0077] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A method for automatically generating a personalized Spee curve based on tooth feature points, characterized in that: The steps include: Step S1: Acquire tooth feature points and adjust the control points to be symmetrically distributed along the midpoint in the Z direction; Step S2: constructing an equation fitting curve according to the tooth feature points; Step S3: deform the fitted points using the TPS deformation method; Step S4: Obtain a personalized Spee curve.

2. The method for automatically generating a personalized Spee curve based on tooth feature points according to claim 1, characterized in that: In step S1, the tooth feature points include the central fossa of maxillary posterior teeth 5-8 and the cusp points of mandibular teeth 3-8. The feature points can be obtained by manual medical annotation or automatically obtained by AI.

3. The method for automatically generating a personalized Spee curve based on tooth feature points according to claim 1, characterized in that: Step S2 specifically includes the following steps: Step S21: constructing an initial curve located on the jaw plane; Step S22: construct a cubic equation using the changes of the control points on the Y axis and the Z axis in step S1 and solve the equation; Step S23: According to the equation solved in step S22, the Y-axis coordinates of the points of the curve to be fitted are taken as input one by one, and the Z-axis coordinates corresponding to the fitted curve points are updated to obtain a new fitted curve.

4. The method for automatically generating a personalized Spee curve based on tooth feature points according to claim 3, characterized in that: In step S21, a curve with Spee of 0, namely, an initial non-personalized Spee curve, is directly obtained and projected onto the upper and lower jaw planes as initial curve points to be fitted.

5. The method for automatically generating a personalized Spee curve based on tooth feature points according to claim 3, characterized in that: In step S22, the constructed cubic equation is in the form of: z=ax 3 +by; Construct z = ax 3 +by, the Vandermonde matrix has the following form: In the above formula, y is the change of the control point on the Y axis, and n represents the number of curve points that need to be fitted. Solving the above formula, we can get the values ​​of parameters a and b, and thus get the corresponding equation.

6. The method for automatically generating a personalized Spee curve based on tooth feature points according to claim 1, characterized in that: In step S3, the index of the point closest to the buccal cusp points of mandibular teeth No. 4 and No. 6 in the fitted curve point is located as the control point, the buccal cusp points of mandibular teeth No. 4 and No. 6 are used as the target points, and several points in the middle of the curve point and the first and last points are set as unchanged control points, and the fitted points are deformed using the TPS deformation method.

7. The method for automatically generating a personalized Spee curve based on tooth feature points according to claim 6, characterized in that: When TPS is deformed, the number of control points in the middle of the curve points selected as unchanged accounts for 1 / 10 of the total number of fitting curves.

8. A system for automatically generating personalized Spee curves based on tooth feature points, characterized in that: include: Data acquisition module: used to obtain characteristic points of teeth; Curve fitting module: used for fitting and generating Spee curve, including an initial curve point acquisition unit, an equation construction and solving unit and a curve fitting unit; the initial curve point acquisition unit is used for constructing an initial curve located in the jaw plane; the equation construction and solving unit is used for constructing and solving equation parameters; the curve fitting unit is used for taking the Y-axis coordinates of the curve points to be fitted as inputs one by one to obtain the equation, and updating the Z-axis coordinates corresponding to the curve points after fitting, so as to obtain a new curve after fitting; TPS deformation module: used to deform the fitted points to form the final Spee curve.

9. A device for automatically generating a personalized Spee curve based on tooth feature points, characterized in that: include: at least one processor; as well as at least one memory in communication with the processor; The memory stores instructions executable by the processor, and the instructions are executed by the processor to enable the device to perform the method for automatically generating a personalized Spee curve based on tooth feature points according to any one of claims 1 to 7.

10. A computer program product, characterized in that: The method comprises computer instructions, which, when executed by a processor, enable a computer device to execute the method for automatically generating a personalized Spee curve based on tooth feature points according to any one of claims 1 to 7.

Images