Method for manufacturing dental prosthesis, computer readable storage medium and manufacturing apparatus
By adjusting the dataset and tool selection for dental prostheses, and combining surface mesh and Cartesian mesh optimization, the problem of tools being unable to reach all surface points in dental prosthesis manufacturing was solved, achieving high-precision and high-efficiency manufacturing results.
Patent Information
- Application Number
- CN202510566103.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-05-03
- Filing Date
- 2025-04-30
- Publication Date
- 2025-11-04
AI Technical Summary
Existing technologies struggle to manufacture dental restorations with high precision and efficiency, especially in transitional areas of complex shapes, where tools cannot reach all surface points, resulting in low manufacturing accuracy and efficiency.
By adjusting the dataset to make the spatial shape surface curvature radius of the dental restoration greater than or equal to the tool radius, and by using a combination of surface mesh and discrete Cartesian mesh, the error function and Laplace smoothing are optimized, inaccessible areas are partitioned, appropriate manufacturing materials and tools are selected, and machining is carried out using milling tools or drills.
This technology enables high-precision manufacturing of dental restorations, avoiding sharp edges, reducing computation time, and improving manufacturing efficiency and accuracy.
Smart Images
Figure CN120884385A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The invention relates to a method for manufacturing a dental restoration, a computer-readable storage medium for carrying out the method and a manufacturing device having a computer-readable storage medium. SUMMARY
[0002] It is a technical object of the invention to improve the manufacturing of dental restorations.
[0003] This object is achieved by a method for manufacturing a dental restoration according to the invention, a computer-readable storage medium for carrying out the method and a manufacturing device having a computer-readable storage medium. Advantageous embodiments are described in the description and in the figures.
[0004] According to a first aspect, the object is achieved by a method for manufacturing a dental restoration, the method comprising the steps of providing a data set reproducing a spatial shape of the dental restoration, selecting a tool for preparing the dental restoration, the tool having a predetermined tool radius, and adjusting the data set such that a radius of curvature at a surface of the reproduced spatial shape is greater than or equal to the tool radius. The technical advantage achieved by this method is that the dental restoration can be manufactured with higher precision.
[0005] In a technically advantageous embodiment of the method, the data set is adjusted such that all points at the surface of the reproduced spatial shape can be reached by the tool. The technical advantage achieved thereby is for example that the dental restoration can be manufactured completely by the selected tool.
[0006] In another technically advantageous embodiment of the method, the spatial shape of the dental restoration is reproduced by a surface mesh. The technical advantage achieved thereby is for example that the spatial shape can be reproduced with higher precision by relatively less data.
[0007] In another technically advantageous embodiment of the method, the surface mesh is converted into a discrete Cartesian grid. The technical advantage achieved thereby is for example that the data set can be easily adapted to the tool radius.
[0008] In another technically advantageous embodiment of the method, the radius of curvature at the surface of the reproduced spatial shape is calculated based on the discrete Cartesian grid. The technical advantage achieved thereby is for example that the data set can also be easily adapted to the tool radius.
[0009] In another technically advantageous embodiment of the method, the discrete Cartesian grid is adjusted such that the radius of curvature at the surface of the reproduced spatial shape is greater than or equal to the tool radius. The technical advantage achieved thereby is for example that the dental restoration can be manufactured with the selected tool.
[0010] In another technically advantageous embodiment of the method, the vertices of the surface grid are moved towards the directions of the adapted discrete Cartesian grid. The technical advantage achieved thereby is, for example, that the data set can be adapted to the tool radius in a simple manner.
[0011] In another technically advantageous embodiment of the method, an error function is optimized, which is based on the distances between the vertices of the surface grid and the points of the discrete Cartesian grid and / or on a Laplace smoothing. The technical advantage achieved thereby is, for example, that a smooth spatial shape of the dental restoration without edges can be produced.
[0012] In another technically advantageous embodiment of the method, the surface of the reproduced spatial shape can be divided into a first subregion which can be reached by the tool and a second subregion which cannot be reached by the tool. The technical advantage achieved thereby is, for example, that only the respective subregion can be optimized and the computation time can be reduced.
[0013] In another technically advantageous embodiment of the method, the manufacturing material of the dental restoration is selected based on the radius of curvature at the surface of the reproduced spatial shape. The technical advantage achieved thereby is, for example, that the dental restoration can be produced more realistically with a higher radius of curvature.
[0014] In another technically advantageous embodiment of the method, the tool is selected based on the radius of curvature of the reproduced spatial shape. The technical advantage achieved thereby is, for example, that a suitable tool for producing the dental restoration is obtained.
[0015] In another technically advantageous embodiment of the method, the tool is a mill or a drill. The technical advantage achieved thereby is, for example, that the dental restoration can be produced efficiently.
[0016] In another technically advantageous embodiment of the method, the dental restoration is produced based on the data set. The technical advantage achieved thereby is, for example, that the dental restoration is produced with a higher spatial accuracy.
[0017] According to a second aspect, the object is achieved by a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method according to the first aspect. The advantages achieved thereby are the same as the advantages achieved by the method according to the first aspect.
[0018] According to a third aspect, the object is achieved by a manufacturing device for producing a dental restoration having the computer-readable storage medium according to the second aspect. The advantages achieved thereby are the same as the advantages achieved by the method according to the first aspect. BRIEF DESCRIPTION OF DRAWINGS
[0019] Embodiments of the present application are illustrated in the accompanying drawings and described in detail below. Therein: Figure 1 A view of a dental restoration is shown; Figure 2 A view of a voxelized dental restoration is shown; Figure 3 A view of a dental restoration for tools with three different tool radii is shown; Figure 4 A view of a dental restoration with different radii of curvature is shown; Figure 5 A view of a dental restoration made of different manufacturing materials is shown; and Figure 6 A block diagram of a method for manufacturing a dental restoration is shown. DETAILED DESCRIPTION
[0020] Figure 1 A view of a dental restoration 100 with a predetermined spatial shape 107 is shown. The dental restoration is, for example, a dental bridge, a dental crown, a dental inlay or a dental overlay. The dental restoration 100 is designed by means of a computer, for example by means of CAD software. Therein the dental restoration 100 is reproduced by a digitized data set which reproduces the spatial shape 107 of the dental restoration 100 and other characteristics, such as the manufacturing material.
[0021] The data set for this comprises the spatial coordinates of the grid points (vertices) at the surface of the dental restoration 100 which are connected to one another by a large number of grid lines. Thereby a non-overlapping surface grid of the space of the dental restoration 100 is generated by a large number of grid cells. The spatial shape 107 of the dental restoration 100 is reproduced by this surface grid.
[0022] From this original data set the physical geometry of the dental restoration can be calculated which can be generated by means of the selected tool 103. For this specific curvature conditions are applied to the surface of the dental restoration. In this method the original spatial shape 107 of the dental restoration 100 is changed so that all points on the surface of the dental restoration 100 can be reached or touched by the tool 103 with the predetermined tool radius 105.
[0023] Figure 2 A view of a voxelized discrete dental restoration 100 is shown. In the course of the voxelization the volume of the original spatial shape 107 of the dental restoration 100 is filled by discrete hexahedron-like voxels. After the voxelization the original spatial shape 107 of the dental restoration 100 is not indicated by a spatial grid but by the space occupied by the individual voxels which fill the space in a discrete manner. The voxels are placed in a Cartesian grid 111.
[0024] By voxelizing the spatial shape 107, the calculation result can be simplified and improved when calculating the curvature of the surface. In comparison to the calculation based on the surface mesh, it is possible to prevent the occurrence of discretization artifacts.
[0025] Figure 3 A view of the dental restoration 100 with three different radii of curvature 115-1 to 115-3 in the transition area between the two teeth is shown. The spatial shape 107 of the original design of the dental restoration 100 has, for example, a radius of curvature 115-1 in the transition area of the surface mesh 109 between the teeth.
[0026] If a tool 103 with a larger tool radius 105 is to be used, the spatial shape 107 of the dental restoration 100 is adjusted in the transition area by the method such that the radius of curvature 115-2 between the teeth is greater than or equal to the tool radius 105. If a tool 103 with an even larger tool radius 105 is used, an even larger radius of curvature 115-3 is obtained in the transition area. It is thus ensured that all points of the surface can be reached by the tool 103 and that the dental restoration 100 can be manufactured even in the transition area.
[0027] To this end, the surface of the spatial shape 107 is first divided into two types of sub-areas 117-1 and 117-2. The first type of sub-area 117-1 can be reached by the tool 103, since it has a radius of curvature 115-1 which is greater than the tool radius 105.
[0028] The second type of sub-area 117-2 cannot be reached by the tool 103, since it has a radius of curvature 115-2 which is smaller than the tool radius 105. The vertices 113 of the surface mesh 109 are moved in the sub-area 117-2 in the direction of the voxelized discrete dental restoration 100. By distinguishing between the sub-areas 117-1 and 117-2, the method can be performed target-accurately, so that calculation time can be saved.
[0029] Figure 4 A view of the dental restoration 100 with different radii of curvature 115-1 to 115-3 is likewise shown. The adjustment of the data set is achieved by optimizing an error function which includes a distance to the voxelized discrete shape 107 of the dental restoration 100 and a Laplace smoothing target function.
[0030] A gradient method can be applied iteratively to optimize the surface. This can be supported by changing the topology in an iterative manner, wherein the longest edges are flipped.
[0031] Figure 5 A view of the dental restoration 100 made of different manufacturing materials 119-1 and 119-2 is shown. The manufacturing material 119 of the dental restoration 100 can be calculated, for example, likewise based on the radius of curvature 115 at the surface of the reproduced spatial shape 107.
[0032] If the adjusted spatial shape 107 has a smaller radius of curvature than the radius of curvature of the original shape 107, a stronger manufacturing material 119-2 is used. Conversely, if the adjusted spatial shape 107 has a larger radius of curvature than the radius of curvature of the original shape 107, a weaker manufacturing material 119-1 is used.
[0033] Figure 6 A block diagram of a method for manufacturing a dental restoration 100 is shown. In step S101 a data set is provided which reproduces a spatial shape 107 of a dental restoration 100. In step S102 a tool 103 for manufacturing the dental restoration 100 is selected, which has a predetermined tool radius 105. In step S103 the data set is adjusted such that the radius of curvature 115 at the surface of the reproduced spatial shape 107 is greater than or equal to the tool radius 105.
[0034] Subsequently, this adjusted spatial shape 107 of the dental restoration 100 can be produced from a dental blank by means of a milling process, wherein a corresponding mill or drill is used.
[0035] According to the method, the spatial shape 107 of the dental restoration 100 can be changed by adding or removing manufacturing material. Manufacturing material 119 is added when a tool 103 with a larger tool radius 105 is selected. Conversely, manufacturing material is removed when a tool 103 with a smaller tool radius 105 is selected.
[0036] The method can be executed by a computer program on a computer readable storage medium to implement the individual steps. By the method it can be ensured that the dental restoration 100 can be manufactured precisely with the selected tool 103.
[0037] All features explained and shown in relation to the individual embodiments of the present application can be arranged in different combinations in the subject matter according to the present application to simultaneously achieve their advantageous effects.
[0038] All method steps can be implemented by devices suitable for implementing the respective method steps. All functions performed by the subject matter features can be method steps of a method.
[0039] The scope of the present application is given by the claims and is not restricted by the features explained in the description or shown in the drawings. List of reference signs 100 dental restoration 103 tool 105 tool radius 107 spatial shape 109 surface mesh 111 cartesian mesh 113 vertex 115 radius of curvature 117 sub-region 119 manufacturing material
Claims
1. A method for manufacturing a dental restoration (100), the method comprising the steps of: - Provide a dataset (S101) that reproduces the spatial shape (107) of the dental restoration (100). - Select (S102) a tool (103) for manufacturing the dental prosthesis (100), the tool having a predetermined tool radius (105); and - Adjust (S103) the dataset such that the radius of curvature (115) at the surface of the reproduced spatial shape (107) is greater than or equal to the tool radius (105).
2. The method according to claim 1, wherein, The dataset is adjusted so that all points on the surface of the reproduced spatial shape (107) can be reached by the tool (103).
3. The method according to any one of the preceding claims, wherein, The spatial shape (107) of the dental prosthesis (100) is reproduced by a surface grid (109).
4. The method according to claim 3, wherein, The surface mesh (109) is transformed into a discrete Cartesian mesh (111).
5. The method according to claim 4, wherein, The radius of curvature (115) at the surface of the reproduced spatial shape (107) is calculated based on the discrete Cartesian grid (111).
6. The method according to claim 5, wherein, The discrete Cartesian grid (111) is adjusted such that the radius of curvature (115) at the surface of the reproduced spatial shape (107) is greater than or equal to the tool radius (105).
7. The method according to claim 6, wherein, Move the vertices (113) of the surface mesh (109) toward the direction of the adjusted discrete Cartesian mesh (111).
8. The method according to claim 7, wherein, The error function is optimized based on the distance between the corresponding vertex (113) of the surface mesh (109) and the points of the discrete Cartesian mesh (111) and / or based on Laplace smoothing.
9. The method according to any one of the preceding claims, wherein, The surface of the reproduced spatial shape (107) can be divided into a first sub-region (117-1) that can be reached by the tool (103) and a second sub-region (117-2) that cannot be reached by the tool (103).
10. The method according to any one of the preceding claims, wherein, The manufacturing material (119) of the dental prosthesis (100) is selected based on the radius of curvature (115) at the surface of the reproduced spatial shape (107).
11. The method according to any one of the preceding claims, wherein, The tool (103) is selected based on the radius of curvature (115) at the surface of the reproduced spatial shape (107).
12. The method according to any one of the preceding claims, wherein, The tool (103) is a milling machine or a drill.
13. The method according to any one of the preceding claims, wherein, The dental prosthesis (100) is manufactured based on the dataset.
14. A computer-readable storage medium having a computer program stored thereon, the computer program performing the method according to any one of claims 1 to 13 when executed by a processor.
15. A manufacturing apparatus (200) for manufacturing a dental prosthesis (100) and having a computer-readable storage medium according to claim 14.