Method and system for manufacturing solid cavitation tooth appliance

Abstract

The invention discloses a manufacturing method and system of a solid cavitation tooth appliance. The method comprises the following steps: inputting an initial three-dimensional model and a cavitation model of the appliance; processing the cavitation model to identify the boundary of the cavitation model, and filling holes in the cavitation according to the boundary; the cavitation model is optimized, so that the cavitation model is fused with the initial three-dimensional model of the appliance, and a complete appliance three-dimensional model is generated; and manufacturing the appliance through the appliance three-dimensional model. By filling the holes of the cavitation model, the cavitation model can be solid, meanwhile, after the cavitation model and the appliance model are fused, integrated manufacturing is carried out, falling of a filling material can be avoided, the solid cavitation model can be accurately manufactured, interference with gingiva and soft tissue of a patient is avoided, and the safety of the patient is improved. Meanwhile, the solid cavitation model can effectively provide supporting force in the horizontal direction for adjacent teeth in the tooth missing area, and inclination and lodging of the adjacent teeth are effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of dental appliance models, and in particular to a method and system for manufacturing a solid cavitary dental appliance. Background Art

[0002] In modern society, more and more people pay attention to the beauty of their appearance and smile. Although traditional metal brackets and archwires are effective, they are not aesthetically pleasing, and may cause psychological burden, especially for adults and professionals. Invisible braces are transparent and inconspicuous, which meets the patients' demand for aesthetics, so invisible braces are quickly applied in clinical practice. The compression molded invisible braces are beautiful, transparent, and comfortable. They play a good role in treating simple alignment cases, but in more complex case scenarios such as tooth extraction, problems such as loss of anchorage may occur.

[0003] In the process of closing the missing tooth gap, such as the common case of premolar extraction, the common problem of the current bracketless pressed film invisible braces is that the control of the missing tooth area is weak. The adjacent teeth on both sides are difficult to move in parallel during the process of closing the gap, and they tilt toward the extraction area, resulting in a "roller coaster effect" that is not conducive to the treatment result.

[0004] The current pressed film invisible orthodontic appliances use the tooth extraction cavitation model to locally enhance the braces, but due to process limitations, its cavitation structure still cannot prevent the teeth from falling into the gap, resulting in poor treatment results, long correction time, and even the need for other auxiliary means to complete the case. Summary of the invention

[0005] In view of this, the present invention proposes a method and system for manufacturing a solid cavitation dental appliance, which can resist the pressure of the teeth on both sides falling toward the edentulous area by establishing a solid cavity in the edentulous area. The manufacturing efficiency of the solid cavity is higher, and the one-piece molding manufacturing method can avoid the falling off of the filling material. At the same time, the precise structural manufacturing can improve the cleanliness of the oral cavity. The present invention provides the following technical solutions:

[0006] A method for manufacturing a solid cavitating dental appliance, the method comprising:

[0007] Input the initial 3D model of the appliance and the cavitation model;

[0008] Processing the cavitation model to identify its boundaries and filling the holes in the cavitation according to the boundaries;

[0009] Optimize the cavitation model so that the cavitation model is integrated with the initial three-dimensional model of the orthodontic appliance to generate a complete three-dimensional model of the orthodontic appliance;

[0010] The appliance is made from a three-dimensional model.

[0011] Further, the method of processing the cavitation model to identify its boundary includes:

[0012] When a template tooth is used as the extraction cavitation cavity, the position of the boundary is specified on the template tooth.

[0013] Further, the method of processing the cavitation model to identify its boundary includes:

[0014] Find the points and edges of the mesh open boundaries of the cavitation model to identify the locations of the boundaries.

[0015] Further, the method of processing the cavitation model to identify its boundary and filling the holes in the cavitation according to the boundary includes:

[0016] Determine the position of the center of the surface of the hole filling part along the root-crown direction of the tooth axis of the cavitation model;

[0017] Correct the center position so that there is a gap between the surface of the hole-filled part and the gums;

[0018] Correcting the geometric shape of the hole-filling portion according to a mesh smoothing algorithm so that it has a smooth transition between the determined geometric center position and the identified boundary;

[0019] The boundary points are parameterized onto a unit circle on a 2D plane and triangulated using the constrained Delaunay triangulation (CDT) algorithm to fill the holes.

[0020] Furthermore, the method of correcting the geometric shape of the hole filling part according to the grid smoothing algorithm so that the geometric shape has a smooth transition between the determined geometric center position and the identified boundary includes:

[0021] The constraint condition z is constructed by the geometric center position of the hole filling part and the boundary of the cavitation model. bc , establish the Laplace operator L of the hole-filling part of the grid, and use the vertex of the cavitation model as the variable x to construct the Laplace equation:

[0022]

[0023] Rearrange the variables x into unknown quantities x in and the known quantity x b , then the Laplace equation can be further expressed as:

[0024]

[0025] Further we get the linear equation system:

[0026] L in,in x in =-L in,b x b ;

[0027] By solving the linear equations, we can obtain the filled shape that can smoothly transition under the constraints.

[0028] Furthermore, the method of optimizing the cavitation model so as to merge the cavitation model with the initial three-dimensional model of the orthodontic appliance to generate a complete three-dimensional model of the orthodontic appliance includes:

[0029] Construct directed bounding boxes of the teeth adjacent to the cavitation model respectively;

[0030] Scaling each axial direction of the directed bounding box to ensure that its shape can enclose and match the geometric structure of adjacent teeth;

[0031] Perform Boolean subtraction operation on the cavitation model and the scaled bounding box model;

[0032] The cavitation model after the Boolean subtraction operation is subjected to a Boolean addition operation with the initial three-dimensional model of the orthodontic appliance, so as to integrate the cavitation model into the initial three-dimensional model of the orthodontic appliance and generate a complete three-dimensional model of the orthodontic appliance.

[0033] The present invention further discloses a system for manufacturing a solid cavitation dental appliance, comprising:

[0034] A model input module, used to input an initial three-dimensional model of the appliance and a cavitation model;

[0035] A model processing module is used to process the cavitation model to identify its boundaries and fill the holes in the cavitation according to the boundaries; and also used to,

[0036] Optimize the cavitation model so that the cavitation model is integrated with the initial three-dimensional model of the orthodontic appliance to generate a complete three-dimensional model of the orthodontic appliance;

[0037] The model making module is used to make the orthodontic appliance through the three-dimensional model of the orthodontic appliance.

[0038] The present invention further discloses a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

[0039] The present invention further discloses an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the program.

[0040] The present invention further discloses a computer program product, comprising a computer program, wherein the computer program implements the above method when executed by a processor.

[0041] According to the technical solution of the present invention, the cavitation model can be solidified by filling the holes in the cavitation model. At the same time, after the cavitation model and the orthodontic appliance model are fused, they can be produced as an integrated whole, which helps to avoid the falling off of the filling material. The solidified cavitation model can be precisely produced to avoid interference with the patient's gums and soft tissues, reducing the possibility of infection and inflammation in the patient. At the same time, the solid cavitation model can effectively provide horizontal support for the adjacent teeth in the edentulous area, effectively avoiding the tilting and lodging of the adjacent teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] For the purpose of illustration and not limitation, the present invention is now described in conjunction with the embodiments of the present invention and the accompanying drawings, in which:

[0043] Figure 1 is a schematic flow chart of a method for manufacturing a solid cavitation dental appliance in an embodiment of the present invention;

[0044] Figure 2 is a structural schematic diagram of a manufacturing system for a solid cavitation dental appliance in an embodiment of the present invention;

[0045] Figure 3 is a schematic diagram of the structure of an electronic device in an embodiment of the present invention;

[0046] Figure 4 It is an example diagram of the hole filling part in the embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the implementation mode of the present application. Obviously, the described implementation mode is only a part of the implementation mode of the present application, not all the implementation modes. Based on the implementation mode in the present application, all other implementation modes obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0048] It should be noted that the terms "first", "second", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0049] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its implementation methods, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0050] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the term "plurality" should mean two or more than two.

[0051] It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0052] In the process of closing the gap in the edentulous area through orthodontic treatment, the gap in the edentulous area is changed by applying force to the teeth adjacent to the edentulous area and pulling them toward the edentulous area. The current bracketless pressed film invisible braces have weak control over the edentulous area. When the adjacent teeth on both sides close the gap in the edentulous area, it is difficult for the adjacent teeth on both sides to move in parallel, and the adjacent teeth tilt toward the edentulous area, resulting in a roller coaster effect that is not conducive to the treatment result.

[0053] In order to solve this problem, this embodiment discloses a method for making a solid cavitation dental appliance, referring to Figure 1 , the method comprises the following steps:

[0054] S100: Input the initial 3D model and cavitation model of the appliance. It should be understood that the initial 3D model of the appliance here is a 3D model of the appliance made of the patient's normal teeth, and the cavitation model is a 3D model of the patient's edentulous area. The cavitation model in the current step can achieve filling of the edentulous area. The 3D data of the initial 3D model and cavitation model of the appliance have sufficient resolution to meet the precision requirements of appliance manufacturing.

[0055] S200: Process the cavitation model to identify its boundaries, and fill the holes in the cavitation according to the boundaries. In this embodiment, the boundary of the cavitation model refers to the tooth neck line of the missing tooth. In step S100, the cavitation model can be obtained by using a template tooth as a tooth extraction cavitation and scanning the template tooth. In this way, the boundary of the cavitation model can be recognized by pre-specifying on the template tooth. In one or more embodiments, the boundary of the cavitation model can also be recognized by finding the points and edges of the grid open boundary of the input cavitation model. After identifying the boundary of the cavitation model, the method of filling the holes in the cavitation according to the boundary includes:

[0056] S210: Determine the position of the center of the surface of the hole filling part along the root-crown direction of the tooth axis of the cavitation model. The center point can be represented as the center point of the open boundary of the cavitation model in the cavitation model. The root-crown direction of the tooth axis of the cavitation model can clearly show the filling form of the edentulous area. The cavitation model after filling is a solid structure, which can provide displacement correction support for the adjacent teeth on both sides to avoid the tilting movement of the adjacent teeth.

[0057] S220: Correct the center position so that there is a gap between the surface of the hole filling part and the gums. Since the growth of the gums in the edentulous area will change in shape when the hole is missing, in order to avoid the solid cavitation structure after the hole filling is completed from interfering with the gums, thereby preventing the accumulation of food residues or bacterial infection or inflammation, the center position of the surface of the hole filling part is corrected along the root crown direction of the tooth axis of the cavitation model, and then the height of the hole filling part is corrected so that there is a gap between the end of the solid cavitation and the gums, which is adapted to the patient's gums and soft tissues to solve the above problems.

[0058] S230: Correct the geometric shape of the hole filling part according to the mesh smoothing algorithm so that it has a smooth transition between the determined geometric center position and the identified boundary. Specifically, first, the boundary and center position of the cavitation model obtained in step S200 and step S220 are used as constraint conditions. bc , establish the Laplace operator L of the hole-filling part of the grid, and use the vertex of the cavitation model as the variable x to construct the Laplace equation:

[0059]

[0060] Rearrange the variables x into unknown quantities x in and the known quantity x b , then the Laplace equation can be further expressed as:

[0061]

[0062] Further we get the linear equation system:

[0063] L in,in xin =-L in,b x b ;

[0064] By solving the linear equations, we can obtain the filled shape that can smoothly transition under the constraints.

[0065] Exemplary, reference Figure 4 , the boundary and center point are known boundary values, and the vertex is an unknown variable. By fixing the boundary and moving the midpoint upward, a smooth transition vertex position can be obtained. The Laplacian matrix of the three-dimensional mesh model can be calculated as follows:

[0066]

[0067] Where D and W are the degree matrix of the grid connection graph and the edge weight matrix, respectively. The weight matrix can be calculated in many ways. When the weights of the edges are all 1, it is the adjacency matrix of the graph. In this implementation, we use the cotangent weight where α and β are the edges e ij two opposite angles.

[0068] S240: The boundary points are parameterized onto a unit circle on a two-dimensional plane and triangulated using the constrained Delaunay triangulation (CDT) algorithm to fill the holes.

[0069] S300: Optimize the cavitation model so that the cavitation model is integrated with the initial three-dimensional model of the appliance to generate a complete three-dimensional model of the appliance. Since the solid cavitation and the appliance need to be integrally formed, the solid cavitation and other adjacent teeth of the appliance need to have good structural continuity and stability. The technical solutions adopted in this implementation method specifically include:

[0070] S310: Construct directed bounding boxes of the teeth adjacent to the cavitation model respectively.

[0071] S320: scaling each axial direction of the directed bounding box to ensure that its shape can enclose and match the geometric structure of adjacent teeth.

[0072] S330: Performing a Boolean subtraction operation on the cavitation model and the scaled bounding box model. Through the Boolean subtraction operation, it can be ensured that only the shape of the cavitation model is retained in the bounding box, and the redundant part is removed, so that the bounding box meets the design requirements of the appliance model.

[0073] S340: Perform a Boolean addition operation on the cavitation model after the Boolean subtraction operation and the initial three-dimensional model of the appliance to integrate the cavitation model into the initial three-dimensional model of the appliance and generate a complete three-dimensional model of the appliance. After the cavitation model and the initial three-dimensional model of the appliance are integrated, the continuity and stability of the overall structure are further enhanced.

[0074] S400: Produce an appliance using the appliance three-dimensional model. Use the acquired appliance three-dimensional model to produce an integrally formed appliance with solid cavitation using 3D printing technology. In one or more embodiments, the integrally formed appliance can also be produced by CNC milling, laser cutting or thermoforming.

[0075] In summary, the method for making a solid cavitation dental appliance disclosed in this embodiment can fill the cavitation model, and the filling shape of the cavitation model can be modified as needed during filling to avoid the impact of the solid cavitation on the gums of the patient's edentulous area. In the application of the appliance, the solid cavitation model can effectively provide horizontal support for the adjacent teeth in the edentulous area, effectively avoiding the tilting and lodging of the adjacent teeth. At the same time, an integrated molding manufacturing process can be realized based on the obtained three-dimensional model of the appliance, which has higher model accuracy and processing efficiency than traditional manual filling, and the filling will not fall off during use.

[0076] refer to Figure 2 This embodiment further discloses a system for manufacturing a solid cavitation dental appliance, including:

[0077] A model input module 21, used for inputting an initial three-dimensional model and a cavitation model of the orthodontic appliance;

[0078] The model processing module 22 is used to process the cavitation model to identify its boundary and fill the holes in the cavitation according to the boundary. Specifically: when a template tooth is used as a tooth extraction cavitation, the position of the boundary is specified on the template tooth; the points and edges of the grid open boundary of the cavitation model are found to identify the position of the boundary; the position of the center of the surface of the hole filling part along the root crown direction of the tooth axis of the cavitation model is determined; the center position is corrected so that there is a gap between the surface of the hole filling part and the gums; the geometric shape of the hole filling part is corrected according to the grid smoothing algorithm so that it has a smooth transition between the determined geometric center position and the identified boundary. The method of correcting the geometric shape of the hole filling part according to the grid smoothing algorithm so that it has a smooth transition between the determined geometric center position and the identified boundary includes: constructing a constraint condition z based on the geometric center position of the hole filling part and the boundary of the cavitation model. bc , establish the Laplace operator L of the hole-filling part of the grid, and use the vertex of the cavitation model as the variable x to construct the Laplace equation:

[0079]

[0080] Rearrange the variables x into unknown quantities x in and the known quantity x b , then the Laplace equation can be further expressed as:

[0081]

[0082] Further we get the linear equation system:

[0083] L in,in x in =-L in,b x b ;

[0084] By solving the linear equations, we can obtain the filled shape that can smoothly transition under the constraints.

[0085] The model processing module 22 is also used to optimize the cavitation model so that the cavitation model is integrated with the initial three-dimensional model of the appliance to generate a complete three-dimensional model of the appliance, specifically: respectively constructing directed bounding boxes of teeth adjacent to the cavitation model; scaling each axial direction of the directed bounding box to ensure that its shape can enclose and match the geometric structure of adjacent teeth; performing a Boolean subtraction operation on the cavitation model and the scaled bounding box model; performing a Boolean addition operation on the cavitation model after the Boolean subtraction operation and the initial three-dimensional model of the appliance to integrate the cavitation model into the initial three-dimensional model of the appliance and generate a complete three-dimensional model of the appliance;

[0086] The model making module 23 is used to make the orthodontic appliance by using the three-dimensional model of the orthodontic appliance.

[0087] Figure 3 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as Figure 3 As shown, the electronic device 50 includes: a processor 501 (processor), a memory 502 (memory) and a bus 503;

[0088] The processor 501 and the memory 502 communicate with each other via the bus 503 ; the processor 501 is used to call the program instructions in the memory 502 to execute the methods provided by the above-mentioned method implementation methods.

[0089] This embodiment further provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0090] This embodiment provides a non-transitory computer-readable storage medium, which stores computer instructions. The computer instructions enable a computer to execute the methods provided by the above-mentioned method embodiments.

[0091] A person skilled in the art can understand that all or part of the steps for implementing the above-mentioned method implementation method can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium, which, when executed, executes the steps of the above-mentioned method implementation method; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, etc., various storage media that can store program codes.

[0092] The device implementation described above is merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present implementation scheme. Those of ordinary skill in the art may understand and implement it without creative effort.

[0093] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each implementation method or some parts of the implementation method.

[0094] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a solid cavitating dental appliance, characterized in that: The method comprises: Input the initial 3D model of the appliance and the cavitation model; Processing the cavitation model to identify its boundaries and filling the holes in the cavitation according to the boundaries; Optimize the cavitation model so that the cavitation model is integrated with the initial three-dimensional model of the orthodontic appliance to generate a complete three-dimensional model of the orthodontic appliance; The appliance is made from a three-dimensional model.

2. The method for manufacturing a solid cavitating dental appliance according to claim 1, characterized in that: The method of processing a cavitation model to identify its boundary comprises: When a template tooth is used as the extraction cavitation cavity, the position of the boundary is specified on the template tooth.

3. The method for manufacturing a solid cavitating dental appliance according to claim 1, characterized in that: The method of processing a cavitation model to identify its boundary comprises: Find the points and edges of the mesh open boundaries of the cavitation model to identify the locations of the boundaries.

4. The method for manufacturing a solid cavitating dental appliance according to claim 1, characterized in that: The method of processing the cavitation model to identify its boundary and filling the holes in the cavitation according to the boundary comprises: Determine the position of the center of the surface of the hole filling part along the root-crown direction of the tooth axis of the cavitation model; Correct the center position so that there is a gap between the surface of the hole-filled part and the gums; Correcting the geometric shape of the hole-filling portion according to a mesh smoothing algorithm so that it has a smooth transition between the determined geometric center position and the identified boundary; The boundary points are parameterized onto a unit circle on a 2D plane and triangulated using the constrained Delaunay triangulation (CDT) algorithm to fill the holes.

5. The method for manufacturing a solid cavitating dental appliance according to claim 4, characterized in that: The method of correcting the geometric shape of the hole filling part according to the grid smoothing algorithm so that the geometric shape of the hole filling part has a smooth transition between the determined geometric center position and the identified boundary includes: The constraint condition z is constructed by the geometric center position of the hole filling part and the boundary of the cavitation model. bc , establish the Laplace operator L of the hole-filling part of the grid, and use the vertex of the cavitation model as the variable x to construct the Laplace equation: Rearrange the variables x into unknown quantities x in and the known quantity x b , then the Laplace equation can be further expressed as: Further we get the linear equation system: L in,in x in =-L in,b x b ; By solving the linear equations, we can obtain the filled shape that can smoothly transition under the constraints.

6. The method for manufacturing a solid cavitating dental appliance according to claim 1, characterized in that: The method of optimizing the cavitation model so as to merge the cavitation model with the initial three-dimensional model of the orthodontic appliance to generate a complete three-dimensional model of the orthodontic appliance includes: Construct directed bounding boxes of the teeth adjacent to the cavitation model respectively; Scaling each axial direction of the directed bounding box to ensure that its shape can enclose and match the geometric structure of adjacent teeth; Perform Boolean subtraction operation on the cavitation model and the scaled bounding box model; The cavitation model after the Boolean subtraction operation is subjected to a Boolean addition operation with the initial three-dimensional model of the orthodontic appliance, so as to integrate the cavitation model into the initial three-dimensional model of the orthodontic appliance and generate a complete three-dimensional model of the orthodontic appliance.

7. A system for manufacturing a solid cavitation dental appliance, characterized in that: include: A model input module, used to input an initial three-dimensional model of the appliance and a cavitation model; A model processing module is used to process the cavitation model to identify its boundaries and fill the holes in the cavitation according to the boundaries; and also used to, Optimize the cavitation model so that the cavitation model is integrated with the initial three-dimensional model of the orthodontic appliance to generate a complete three-dimensional model of the orthodontic appliance; The model making module is used to make the orthodontic appliance through the three-dimensional model of the orthodontic appliance.

8. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method described in any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, which, when executed by a processor, implements the method according to any one of claims 1 to 6.

Images