Method for creating three-dimensional shape data for shaping plurality of materials, program, and creating device

Abstract

To obtain three-dimensional shape data for shaping from a plurality of materials, color tones or the like.SOLUTION: In a method for creating three-dimensional shape data to be used for shaping by a plurality of materials, a method for operating a computer includes: a step of acquiring three-dimensional shape data of a monoblock; a step of dividing three-dimensional shape data of a monoblock; a step of calculating a boundary of divided three-dimensional shape data; a step of creating faces matching the boundary by the number divided in the step; a step of setting a direction of a normal vector of the faces outward; a step of matching the faces and an edge end of divided three-dimensional shape data; a step of connecting the faces and divided three-dimensional shape data; and a step of outputting the three-dimensional shape data created by the method.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method, a program, and an apparatus for creating three-dimensional shape data for multiple-material modeling. [Background technology]

[0002] In recent years, dual-head fused deposition modeling 3D printers and inkjet 3D printers have been developed, making it possible to create one-piece models using multiple materials. To perform one-piece modeling using two types of materials with a dual-head fused deposition modeling 3D printer, at least two or more closed three-dimensional shape data must be output as STL data from a three-dimensional CAD system in a contacting positional relationship. At least two or more pieces of three-dimensional shape data that meet the above conditions are input into the slicer software, and modeling data for a one-piece model using two types of materials is created by setting whether head A or head B will be used for modeling for each piece of three-dimensional shape data. Then, by inputting the modeling data into the 3D printer, a one-piece model using two types of materials can be obtained.

[0003] Patent Document 1 discloses a method for producing a denture base including an artificial tooth portion and a denture base having an alveolar ridge covering portion that covers the alveolar ridge mucosa. The method described in Patent Document 1 includes a shape data acquisition step for acquiring shape data of the denture base, and a modeling step for three-dimensionally modeling the denture base by changing the properties based on the acquired shape data, and produces dentures with different properties depending on the part using a 3D printer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-225777 A Summary of the Invention [Problem to be solved by the invention]

[0005] In some cases, it may not be possible to create 3D shape data for multiple material modeling in dedicated 3D CAD due to limitations in design methods and design data output. For example, in some dental 3D CAD software, 3D shape data for a complete denture consisting of artificial teeth and a denture base is output as 3D shape data of the artificial teeth and denture base combined, or only 3D shape data of the denture base is output after forming a socket to fit the artificial teeth. In addition, the output 3D shape data is moved and rotated based on the coordinate information at the time of design.

[0006] Also, when three-dimensional shape data is acquired by a three-dimensional scanner, a shape having a plurality of components is output as integrated three-dimensional shape data.

[0007] An object of the present invention is to provide a method, a program, and an apparatus for creating three-dimensional shape data for multi-material modeling. [Means for solving the problem]

[0008] A method for creating three-dimensional shape data used for modeling using multiple materials according to one aspect of the present invention includes the steps of: A method for creating three-dimensional shape data for multiple-material modeling by a computer, comprising the steps of: Obtaining three-dimensional shape data of the monoblock; A step of dividing three-dimensional shape data of the monoblock; A step of calculating a boundary line of the divided three-dimensional shape data; creating faces that match the boundary line by the number of divisions in the step; orienting the normal vector of the surface outward; A step of matching the surface with an edge of the divided three-dimensional shape data; combining the surface with the segmented three-dimensional shape data; A step of outputting the three-dimensional shape data created by the method; Includes.

[0009] A program for creating three-dimensional shape data used for modeling using multiple materials according to one embodiment of the present invention includes: A program for creating three-dimensional shape data for multiple-material modeling by a computer, Obtaining three-dimensional shape data of the monoblock; A step of dividing three-dimensional shape data of the monoblock; A step of calculating a boundary line of the divided three-dimensional shape data; creating faces that match the boundary line by the number of divisions in the step; orienting the normal vector of the surface outward; A step of matching the surface with an edge of the divided three-dimensional shape data; combining the surface with the segmented three-dimensional shape data; A step of outputting the three-dimensional shape data created by the method; Execute.

[0010] An apparatus for creating three-dimensional shape data used for modeling using multiple materials according to one aspect of the present invention comprises: A three-dimensional shape data creation device that creates three-dimensional shape data for multiple-material modeling from three-dimensional shape data of a monoblock, comprising: A control device for generating three-dimensional shape data for multiple material modeling based on the three-dimensional shape data of the monoblock; Equipped with The control device includes: one or more processors; a memory storing instructions executable by said one or more processors; having The instruction: Obtaining three-dimensional shape data of the monoblock; A step of dividing three-dimensional shape data of the monoblock; A step of calculating a boundary line of the divided three-dimensional shape data; creating faces that match the boundary line by the number of divisions in the step; orienting the normal vector of the surface outward; A step of matching the surface with an edge of the divided three-dimensional shape data; combining the surface with the segmented three-dimensional shape data; A step of outputting the three-dimensional shape data created by the method; Includes. Effect of the Invention

[0011] According to the present invention, it is possible to create highly accurate three-dimensional shape data for multi-material modeling even for complex shapes. [Brief description of the drawings]

[0012] [Figure 1] Positional relationship diagram [Diagram 2] FIG. 1 shows the positional relationship after data output according to the prior art. [Diagram 3] Monoblock diagram [Figure 4] Flowchart of the present invention [Diagram 5] Figure showing data from ST1 [Figure 6] Figure showing ST2 data [Figure 7] Figure showing data from ST3 [Figure 8] FIG. 1 shows data of ST1 according to an embodiment. [Figure 9] FIG. 1 shows data of ST2 according to an embodiment (crown part) [Figure 10] FIG. 13 shows data of ST2 according to an embodiment (gingiva) [Figure 11] FIG. 1 shows data of ST3 according to an embodiment (crown part). [Figure 12] FIG. 13 shows data of ST3 according to an embodiment (gingiva) [Figure 13] FIG. 1 shows data of ST5 according to an embodiment. [Explanation of symbols]

[0013] 1 Data after division (crown part) 2 Data after division (gingiva area) 3 Created surface data DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 1 to 3 are schematic diagrams illustrating the method of the present invention. The present invention is particularly useful when 3D printing a shape consisting of a plurality of different colors and materials using the fused deposition modeling method or the inkjet method.

[0015] Fig. 1 is a schematic diagram of monoblock data of multiple types of materials and colors. When acquiring such data as shape data, according to a data processing method using conventional technology, shape data for each component after data output is output as shown in Fig. 2. For example, in a shape as shown in Fig. 1, where the tooth and gums are integrated, the crown and gums are separated and data as shown in Fig. 2 is output. Therefore, the positional relationship is corrected to acquire the molding shape data as shown in Fig. 3.

[0016] The present invention relates to a method for creating modeling data while maintaining the positional relationship of shape data by dividing monoblock data and creating surfaces.

[0017] A flow chart according to an embodiment of the present invention is shown in FIG. 4. First, in step ST1, data of a monoblock is prepared. For example, in step ST1, teeth are scanned by a scanning device to obtain scan data of the teeth. For example, the scanning device may be an intraoral scanner that scans the inside of a patient's mouth, or a desktop scanner that scans a tooth model. Note that scanning teeth includes scanning actual teeth or scanning a tooth model.

[0018] For example, the tooth scan data may be obtained by directly scanning the patient's oral cavity with an intraoral scanner. In addition, in the case of an abutment tooth model, the tooth scan data may be obtained by placing the abutment tooth model on a stage and acquiring the abutment tooth model with a desktop scanner. Alternatively, the tooth scan data may be obtained by scanning the oral cavity with an intraoral scanner from outside the patient's oral cavity.

[0019] The tooth scan data may also be acquired by receiving it from an external device using a communication device.

[0020] The scan data obtained in step ST1 is a collection of points and the position information of each point. The scan data is often output in the form of point cloud data, STL data that includes the front and back sides and normal vector information of a face when a triangle formed by three adjacent points is treated as a face, wireframe data that is made up of triangles connecting adjacent points, or polygon data that covers each triangle of the wireframe. Among them, STL data is most commonly used in dentistry, and is becoming more and more popular as a common format data that is highly compatible between different manufacturers.

[0021] The scan data is expected to include geometric shapes, free-form surface shapes, shapes consisting of geometric shapes and free-form surface shapes, and the like.

[0022] Step ST2 includes a process of dividing the data of ST1 into components. Dividing into components means dividing the data into parts formed by elements with different color tones, materials, etc. The number of elements to be divided can be any number as long as there are multiple elements.

[0023] Fig. 6 is a schematic diagram of step ST2. Since it is intended that the crown and gingiva are formed with different colors and materials, data is divided for the crown (1) and gingiva (2). Fig. 9 shows the divided data of the crown in ST2 according to an embodiment. Fig. 10 shows the divided data of the gingiva in ST2 according to an embodiment. The divided parts may be determined manually by an operator, or automatically by setting a threshold value on the data. For example, they may be detected based on the curvature or change in curvature of the scan data.

[0024] The divided three-dimensional shape data may also include a step of calculating boundary lines. When the scan data is STL data, the boundary lines may be extracted by converting the scan data into polysurface data. Converting the scan data into polysurface data may make it easier to extract the boundary lines.

[0025] Fig. 7 is a schematic diagram showing data of step ST3. Contact surfaces of multiple data divided by component are formed. Data of ST3 (crown part) according to an embodiment is shown in Fig. 11. Data of ST3 (gingiva part) according to an embodiment is shown in Fig. 12. For example, the surfaces of two divided components in Figs. 11 and 12 of the embodiment correspond and are identical.

[0026] When forming a surface, it is preferable to match the edges of the surface and the divided three-dimensional shape data.

[0027] The method for creating the surface is arbitrary. It may be done manually, or the surface may be pasted using the sweep function of CAD, or it may be done by detecting the contour.

[0028] If the shapes of the surface data are not the same (if the coordinates are not the same), air bubbles and other defects may occur after printing, making the part more susceptible to dirt, resulting in aesthetic problems, or problems such as a decrease in strength may occur.

[0029] In step ST4, the normal vectors of the faces created in ST3 are aligned outward so that the outward direction can be recognized on the CAD.

[0030] In step ST5, the multiple shape data created in ST4 are combined. As in the embodiment, the crown data in Fig. 11 and the gingival data in Fig. 12 are combined to obtain the modeling data as shown in Fig. 13. By combining in this step, the corresponding surfaces of the gingival data and the crown data in the embodiment are combined.

[0031] Through the above steps, modeling data consisting of multiple types of colors and materials can be created.

[0032] Based on the modeling data created by the present invention, it is possible to create models in a variety of colors and materials using, for example, a 3D printer using the fused deposition modeling method or the inkjet method.

[0033] In this embodiment of the present invention, the scanner used is D2000 by 3shape, and the CAD used is Dental designer2021 by 3shape.

[0034] An embodiment of the present invention has been described above with reference to the drawings, but the specific configuration is not limited to this embodiment, and various modifications are also included within the scope that does not deviate from the spirit of the present invention.

Claims

1. A method for creating three-dimensional shape data for multiple-material modeling by a computer, comprising the steps of: Obtaining three-dimensional shape data of the monoblock; A step of dividing three-dimensional shape data of the monoblock; A step of calculating a boundary line of the divided three-dimensional shape data; creating a surface that fits the boundary line; A step of matching the surface with an edge of the divided three-dimensional shape data; combining the surface with the segmented three-dimensional shape data; The method according to claim 1, further comprising:

2. Further, a step of directing the normal vector of the face outward; 2. The method of claim 1, comprising:

3. The three-dimensional shape data of the monoblock is 3D shape data designed using 3D CAD, 3D shape data obtained from the scan data; 3D shape data created by reverse engineering from scan data, The present invention is characterized in that it includes any one of the following: The method of claim 1.

4. The number of divisions of the three-dimensional shape data of the monoblock is 1～１００、 That is, 2. The computer method of claim 1.

5. The coordinate information of the three-dimensional shape data created by the method of claim 1 is are preserved on output, The method of claim 1.

6. A program for causing a computer to execute the method according to any one of claims 1 to 5.

7. A computer-readable recording medium having a program recorded thereon for causing a computer to execute the method according to any one of claims 1 to 6.

8. A three-dimensional shape data creation device that creates three-dimensional shape data for multiple-material modeling from three-dimensional shape data of a monoblock, comprising: A control device for generating three-dimensional shape data for multiple material modeling based on the three-dimensional shape data of the monoblock; Equipped with The control device includes: one or more processors; a memory storing instructions executable by said one or more processors; having The instruction: Obtaining three-dimensional shape data of the monoblock; A step of dividing three-dimensional shape data of the monoblock; A step of calculating a boundary line of the divided three-dimensional shape data; creating faces that match the boundary line by the number of divisions in the step; orienting the normal vector of the surface outward; A step of matching the surface with an edge of the divided three-dimensional shape data; combining the surface with the segmented three-dimensional shape data; A step of outputting the three-dimensional shape data created by the method; A three-dimensional shape data creating device comprising:

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