Three-dimensional data acquisition method, program, three-dimensional data acquisition system, and attachment member

Abstract

To acquire (or have acquired) three-dimensional data with higher accuracy. [Solution] A three-dimensional data acquisition method comprising the steps of attaching an attachment member that is thicker than the contact portion between the denture and the oral cavity wall, using a scanner to obtain scan data of the denture with the attachment member attached, and generating three-dimensional data of the denture based on the scan data, wherein the step of obtaining scan data of the denture includes scanning a first surface of the denture including the attachment member, and scanning a second surface of the denture opposite the first surface including the attachment member.

Description

[Technical Field]

[0001] The present invention relates to a three-dimensional data acquisition method, a program, a three-dimensional data acquisition system, and an attachment member. [Background technology]

[0002] A conventional method for acquiring 3D data of a denture base is known, which involves 3D scanning the maxillary and mandibular removable dentures in an occlusal state to acquire occlusion reference data showing the three-dimensional shape with the occlusal surfaces formed, superimposing first data for the maxillary removable dentures and second data for the mandibular removable dentures on the occlusion reference data, superimposing new upper artificial tooth data on the upper artificial tooth data of the first data and deleting the upper artificial tooth data from the first data, and superimposing the new lower artificial tooth data on the lower artificial tooth data of the second data and deleting the lower artificial tooth data from the second data (Patent Document 1). Also known is an impression-taking method used in the manufacturing process of a denture base equipped with an attachment to be attached to an implant embedded in the alveolar ridge, in which a jig or attachment shaped like the attachment is attached to the implant as a connector to take an impression of the alveolar ridge (Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-159329 [Patent Document 2] Patent Publication No. 2021-104238 Summary of the Invention [Problem to be solved by the invention]

[0004] When replacing old dentures with new ones, three-dimensional data of the old dentures is obtained using a scanner, and then the new dentures are created using a 3D printer, etc. However, because dentures have thin parts, it is sometimes difficult to obtain accurate three-dimensional data.

[0005] The present invention has been made in consideration of these circumstances, and one of its objects is to provide a three-dimensional data acquisition method, program, three-dimensional data acquisition system, and attachment member that can acquire (or cause to be acquired) three-dimensional data with greater accuracy. [Means for solving the problem]

[0006] One aspect of the present invention is a three-dimensional data acquisition method comprising the steps of attaching an attachment member that is thicker than the contact portion between the denture and the oral cavity wall, using a scanner to obtain scan data of the denture with the attachment member attached, and generating three-dimensional data of the denture based on the scan data, wherein the step of obtaining the scan data of the denture includes scanning a first surface of the denture including the attachment member, and scanning a second surface of the denture opposite the first surface including the attachment member.

[0007] Another aspect of the present invention is a program for causing a computer to acquire scan data of a denture, which has an attachment member attached to the contact portion between the denture and the oral cavity wall, the attachment member being thicker than the contact portion, using a scanner, and generating three-dimensional data of the denture based on the scan data, wherein acquiring the scan data of the denture includes scanning a first surface of the denture, including the attachment member, and scanning a second surface of the denture opposite the first surface, including the attachment member.

[0008] Another aspect of the present invention is a three-dimensional data acquisition system comprising an attachment member attachment device that attaches an attachment member that is thicker than the contact portion between a denture and the oral cavity wall, a scanner driving device that uses a scanner to obtain scan data of the denture with the attachment member attached, and an information processing device that generates three-dimensional data of the denture based on the scan data, wherein the scanner driving device drives the scanner or the denture to scan a first surface of the denture, including the attachment member, and to scan a second surface of the denture opposite the first surface, including the attachment member.

[0009] Another aspect of the present invention is an attachment member that is attached to a denture and scanned with a scanner to obtain three-dimensional data of the denture, the attachment member comprising a main body portion having a shape with a longitudinal direction, and a protrusion portion that protrudes from the main body portion in a direction intersecting the longitudinal direction of the main body portion and is fixed to the contact portion between the denture and the oral cavity wall. [Effects of the Invention]

[0010] According to one aspect of the present invention, three-dimensional data can be acquired (or caused to be acquired) with higher accuracy. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of a configuration for executing a three-dimensional data acquisition method. [Figure 2] 1 is a flowchart showing an example of a process flow of a three-dimensional data acquisition method. [Figure 3] 1A to 1C are diagrams illustrating the shape and function of an attachment member 10. [Figure 4] 1 is a diagram illustrating a state in which the attachment member 10 is attached to a denture 30. FIG. [Figure 5] 10 is a diagram for explaining the step of scanning the denture 30. FIG. [Figure 6]1 is a configuration diagram of a three-dimensional data acquisition system 1 configured to automatically perform at least a part of a three-dimensional data acquisition method. [Figure 7] 10 is a view showing a state in which the attachment member 10 is attached to a denture 40 according to another embodiment. FIG. [Figure 8] FIG. 10 is a view showing a state in which the attachment member 10 is attached to a denture 44 according to yet another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] The three-dimensional data acquisition method, program, three-dimensional data acquisition system, and attachment member of the present invention will be described below with reference to the drawings. The three-dimensional data acquisition method is a method for acquiring three-dimensional data of dentures using a scanner in situations such as denture renewal. The program is for causing a computer (processor) to execute at least a portion of the three-dimensional data acquisition method, and the three-dimensional data acquisition system is configured to automatically perform at least a portion of the three-dimensional data acquisition method. The attachment member is used to preferably support scanning and three-dimensional data generation when implementing the three-dimensional data acquisition method.

[0013] In the following description, the three-dimensional data acquisition method is described as involving at least some human work, but as will be explained later, some or all of the three-dimensional data acquisition method may be realized by a program or system.

[0014] [composition] FIG. 1 illustrates an example of a configuration for executing a three-dimensional data acquisition method. The three-dimensional data acquisition method is realized, for example, by an attachment member 10, a scanner 50, an information processing device 100, a 3D printer 200, and an operator OP. The denture 30 is the target for acquiring three-dimensional data. In the illustrated example, the denture 30 is a denture (e.g., a complete denture) with a palate. The palate is a flat member formed to contact the oral cavity wall. The attachment member 10 is attached to the denture 30. The scanner 50 is, for example, a handheld distance measuring device that measures the distance to surrounding objects using the principle of a stereo camera, for example. The information processing device 100 performs a known reconstruction process based on the distance measurement data output by the scanner 50 to generate three-dimensional data of the denture 30. The reconstruction process may involve processes such as a 3D filtered backprojection method, a reprojection method, a rebinning method, or a Radon transform. The information processing device 100 performs various processes, for example, by a processor such as a CPU (Central Processing Unit) executing programs (a group of instructions) stored in a storage device. The 3D printer 200 models a denture based on the three-dimensional data generated by the information processing device 100.

[0015] [Processing flow] FIG. 2 is a flowchart showing an example of the process flow of the three-dimensional data acquisition method. First, the operator OP attaches the attachment member 10 to the denture 30 (S1). Next, the operator OP uses (operates) the scanner 50 to scan the denture 30 with the attachment member 10 attached, and acquires scan data (S2). The scan data is sequentially sent to the information processing device 100. The information processing device 100 acquires the scan data in this way, and generates three-dimensional data of the denture 30 based on the scan data (S3). The processes of S2 and S3 may be repeatedly executed alternately, so that three-dimensional data is added sequentially.

[0016] [Step Details] Next, the information processing device 100 deletes at least a portion of the portion corresponding to the attachment member 10 from the three-dimensional data using software (S4). Then, the 3D printer 200 forms a denture based on the three-dimensional data (S5). The operator OP physically removes the remaining portion of the attachment member 10 (the portion not deleted in S4) by scraping it with a tool or the like.

[0017] Below, we will explain the details of the processing of each step illustrated in Fig. 2. Fig. 3 is a diagram illustrating the shape and function of the attachment member 10, and Fig. 4 is a diagram illustrating the state in which the attachment member 10 is attached to a denture 30. The following explanation will be made using both figures.

[0018] The attachment member 10 includes, for example, a main body 12 having a shape with a longitudinal direction (for example, a long and narrow rectangular parallelepiped shape), and a protruding portion 14 connected to the main body 12. The protruding portion 14 is formed by being integrally molded with the main body 12 or by being bonded thereto. When attached to the denture 30, the main body 12 extends along the rear end 32 of the palatal part of the denture 30. The longitudinal length of the main body 12 is longer than the longitudinal length of the protruding portion 14, and the length of the portion of the protruding portion 14 that protrudes beyond the main body 12 is longer than the lateral length of the main body 12. Thickness ΔZ of the main body 12 10 (length in the Z direction in the figure) is the thickness ΔZ of the rear end 32, which is the contact part between the denture and the oral cavity wall. 30 (Fig. 4). The rear end portion is the rear end portion when the forward direction of the human body is defined as the front. The thickness of the rear end portion 32 is the length in the normal direction to the oral cavity wall. At least one side surface 12A, which is the side surface in the longitudinal direction of the main body portion 12 (X direction in the figure), is provided with recesses (grooves) whose spacing and / or width are not uniform. The side surface 12B opposite to the side surface 12A is provided with protrusions along the longitudinal direction of the main body portion 12. Recesses (grooves) whose spacing and / or width are not uniform may also be provided on the side surface 12B and other side surfaces. The protrusion portion 14 protrudes in a direction intersecting the longitudinal direction of the main body portion 12 (Y direction in the figure) and is fixed to the rear end portion 32 of the denture 30. The protrusion portion 14 is formed so that the width of at least one direction decreases with increasing distance from the main body portion 12.

[0019] 4, the side surface 14A of the protruding portion 14 is joined to the vicinity of the rear end portion 32 of the denture 30 so that a slight gap ΔY is created between the main body portion 12 and the rear end portion 32 of the denture 30. For example, double-sided tape, adhesive, cellophane tape, a magnet, etc. may be used for this joining.

[0020] FIG. 5 is a diagram illustrating the steps of scanning the denture 30. The operator OP first scans the first surface of the denture 30, including the attachment member 10, at intervals of, for example, within a few centimeters. Next, the operator OP scans the attachment member 10 by rotating it in the short direction of the attachment member 10 (rotating it around the main body 12 of the attachment member 10 as an axis) so as to capture the shape of almost the entire attachment member 10 (excluding joints, etc.). The operator OP then similarly scans the second surface of the denture 30, including the attachment member 10. Here, because a denture having a palate is generally flat, the surface that contacts the oral cavity wall and the surface opposite to it are referred to as the first surface and the second surface, respectively, although the relationship between the first and second surfaces may be reversed. The order of these scans may be reversed as desired.

[0021] When generating the three-dimensional data of the denture 30, any of the following methods may be employed. (1) The three-dimensional data obtained by scanning the first surface of the denture 30 and the three-dimensional data obtained by scanning the second surface of the denture 30 are aligned at the attachment member 10 and matched as three-dimensional data. At this time, a predetermined surface (e.g., side surface 12A) of the attachment member 10 included when the scan data of the first surface was acquired is superimposed on a predetermined surface of the attachment member 10 included when the scan data of the second surface was acquired, thereby matching the three-dimensional data of the denture included in the data of the first surface and the data of the second surface. (2) Three-dimensional data of the attachment member 10 is acquired in advance and stored in the information processing device 100, and the three-dimensional data obtained by scanning the first surface of the denture 30 and the three-dimensional data obtained by scanning the second surface of the denture 30 are compared using the known three-dimensional data of the attachment member 10 as a reference. Note that in the above (1) and (2), before converting the scanned data into three-dimensional data, the data may be compared by, for example, matching similar points in the distance data.

[0022] [effect] According to the embodiment described above, the following effects can be achieved. First, the thickness ΔZ of the main body 12 of the attachment member 10 10 is the thickness ΔZ of the rear end 32, which is the contact area between the denture and the oral cavity wall. 30 The rear end 32 is usually formed thin so as not to cause discomfort to the user. For this reason, when scanning from the rear side with the scanner 50, the position of the boundary of the rear end 32 may be lost. In this regard, by using an attachment member 10 that is thicker than the rear end 32, it is possible to accurately obtain the position of at least the attachment member 10, and in the subsequent three-dimensional data generation process, it is possible to accurately reproduce the position of the boundary of the rear end 32 as the relative position with respect to the attachment member 10.

[0023] Furthermore, the side surface 14A of the protrusion 14 is joined to the vicinity of the rear end 32 of the denture 30 so that a slight gap ΔY is created between the main body 12 and the rear end 32 of the denture 30. This allows the process of deleting at least a portion of the portion corresponding to the attachment member 10 to be performed accurately in the process of generating three-dimensional data. This is because if scanning is performed with the main body 12 and the rear end 32 of the denture 30 in contact with each other, the boundary between them will become unclear in the process of generating three-dimensional data.

[0024] Furthermore, the protrusion 14 is formed so that the width in at least one direction decreases the further it is from the main body 12. The process of removing at least a portion of the portion corresponding to the attachment member 10 on the software is performed so as to remove only the main body 12 that is separated from the denture 30 and a portion of the protrusion 14 that is close to the main body 12. Therefore, the process of "the operator OP physically removing the remaining portion of the attachment member 10 by scraping it with a tool or the like" mainly targets the tip portion of the protrusion 14. By forming the shape of the protrusion 14 as described above, the amount of scraping can be reduced, and the process can be made more efficient.

[0025] Furthermore, the two methods exemplified above are used when generating three-dimensional data of the denture 30. The attachment member 10 has recesses (grooves) with non-uniform spacing and / or widths and protrusions along the longitudinal direction on the main body 12, so the shape of the attachment member 10 makes it easy to recognize its position based on the scan data. Therefore, by using the attachment member 10 as a reference, the overall positional relationship can be reflected more accurately in the three-dimensional data than when only the denture 30 is scanned.

[0026] FIG. 6 is a diagram illustrating the configuration of a three-dimensional data acquisition system 1 configured to automatically perform at least a portion of the three-dimensional data acquisition method. The three-dimensional data acquisition system 1 includes an information processing device 100, which functions as a three-dimensional data generation unit, an attachment member attachment device 300, a scanner driving device 310, and a control device 320. The attachment member attachment device 300 includes, for example, a conveyor belt or other transport unit, an arm device, and a monitoring device such as a camera. After confirming the position of the denture 30 transported by the transport unit using the monitoring device, the attachment member 10 is attached automatically or in response to the operation of the arm device by an operator OP. The scanner driving device 310 includes, for example, an arm device that holds the scanner 50. The scanner driving device 310 drives the scanner 50 to scan the fixed-position denture 30 (to which the attachment member 10 is attached) from two directions as described above. Conversely, the scanner driving device 310 may also be configured to move the denture 30 relative to the fixed-position scanner 50, thereby enabling similar data acquisition. The control device 320 controls the attachment member mounting device 300 and the scanner driving device 310 to perform these operations. The control device 320 performs various processes, for example, by having a processor such as a CPU execute a program (a group of instructions) stored in a storage device.

[0027] [Other embodiments] The three-dimensional data acquisition method of the present invention is not limited to dentures having a palate, but can also be applied to dentures of other types. FIG. 7 is a diagram showing an attachment member 10 attached to a denture 40 according to another embodiment. The denture 40 is formed by connecting multiple partial dentures (e.g., a pair of left and right partial dentures) with connecting members 42. The connecting members 42 may be made of resin, metal, or a connecting crown. The attachment member 10 is attached to the connecting members 42, which are the contact points between the dentures and the oral cavity wall. The main body 12 of the attachment member 10 extends along the connecting members 42 when attached to the denture 40 and has a thickness greater than that of the connecting members 42. Other aspects (characteristic shapes of the main body 12 and the protruding portions 14) may be the same as those of the above-described embodiment. In this case, the first and second surfaces in the claims are virtual planes (planes including the x- and y-axes) viewed from the z direction in the figure, and are similar to planes connecting the surfaces of the teeth in the denture. The attachment member 10 extends along the x-axis, similar to the above embodiment.

[0028] FIG. 8 is a diagram showing the attachment member 10 attached to a denture 44 according to yet another embodiment. The denture 44 is a left or right partial denture. The attachment member 10 is attached to the inner end 46 or outer end 48, which is the contact portion between the denture 44 and the oral cavity wall (attached to the inner end 46 in the figure). The main body 12 of the attachment member 10 has a thickness greater than the thickness of either the inner end 46 or the outer end 48 of the denture 44 to which it is attached. Other aspects (characteristic shapes of the main body 12 and the protruding portion 14) may be the same as those of the above-mentioned embodiment. In this case, the first and second surfaces in the claims may be imaginary planes viewed from the z direction in the figure (planes including the x and y axes), imaginary planes viewed from the x direction in the figure (planes including the y and z axes), or imaginary planes viewed from an oblique direction between the z and x directions.

[0029] The above describes the form for carrying out the present invention using an embodiment, but the present invention is not limited to such an embodiment, and various modifications and substitutions can be made within the scope that does not deviate from the gist of the present invention. [Explanation of symbols]

[0030] 1. Three-dimensional data acquisition system 10 Attachment member 12 Main body 14 Protrusion 30, 40, 44 Dentures 32 Rear end 42 Connecting member 46, 48 End 50 Scanner 100 Information processing device 200 3D printers 300 Attachment member mounting device 310 Scanner drive unit 320 Control Device

Claims

1. a step of attaching an attachment member having a thickness greater than that of a contact portion between the denture and the oral cavity wall; using a scanner to obtain scan data of the denture to which the attachment member is attached; generating three-dimensional data of the denture based on the scan data; Equipped with The step of acquiring scan data of the denture includes: scanning a first surface of the denture including the attachment member; and scanning a second surface of the denture opposite to the first surface, including the attachment member. Three-dimensional data acquisition methods.

2. further comprising a step of deleting at least a portion of the portion corresponding to the attachment member from the three-dimensional data. The three-dimensional data acquisition method according to claim 1.

3. The step of generating three-dimensional data of the denture includes: and generating the three-dimensional data by aligning and matching data obtained by scanning the first surface of the denture and data obtained by scanning the second surface of the denture at the attachment member. The three-dimensional data acquisition method according to claim 1.

4. The step of generating three-dimensional data of the denture includes: generating the three-dimensional data by matching data obtained by scanning the first surface of the denture and data obtained by scanning the second surface of the denture with known three-dimensional data of the attachment member as a reference; The three-dimensional data acquisition method according to claim 1.

5. The attachment member includes: a main body portion having a shape with a longitudinal direction; a protrusion protruding from the main body in a direction intersecting the longitudinal direction of the main body and fixed to the contact portion in the attaching step; Equipped with The three-dimensional data acquisition method according to claim 1.

6. The denture is a denture having a palate portion, The main body of the attachment member comprises: a prosthesis attached to the denture, the prosthesis extending along the posterior end of the palatal portion; The contact portion is the rear end of the palatal portion. The three-dimensional data acquisition method according to claim 5.

7. At least one side surface of the main body in the longitudinal direction is provided with recesses having non-uniform intervals and / or widths. The three-dimensional data acquisition method according to claim 5.

8. The protrusion is formed so that the width in at least one direction decreases as the protrusion becomes farther from the main body. The three-dimensional data acquisition method according to claim 5.

9. The denture is a plurality of partial dentures connected by connecting members, the contact portion is the connection member, The attachment member is attached to the connecting member. The three-dimensional data acquisition method according to claim 5.

10. The denture is a partial denture, the contact portion being the inner or outer edge of the partial denture; The three-dimensional data acquisition method according to claim 1.

11. On the computer, a scanner for acquiring scan data of a denture having an attachment member attached to a contact portion between the denture and a wall of the oral cavity, the attachment member being thicker than the contact portion; generating three-dimensional data of the denture based on the scan data; A program for: acquiring scan data of the denture, scanning a first surface of the denture including the attachment member; and scanning a second surface of the denture opposite to the first surface, including the attachment member. program.

12. an attachment member attaching device for attaching an attachment member that is thicker than a contact portion between the denture and a wall of the oral cavity; a scanner driving device that uses a scanner to obtain scan data of the denture to which the attachment member is attached; an information processing device that generates three-dimensional data of the denture based on the scan data; Equipped with the scanner driving device drives the scanner or the denture to scan a first surface of the denture including the attachment member, and to scan a second surface of the denture opposite to the first surface including the attachment member; Three-dimensional data acquisition system.

13. An attachment member that is attached to a denture and scanned by a scanner to acquire three-dimensional data of the denture, a main body portion having a shape with a longitudinal direction; a protrusion protruding from the main body in a direction intersecting the longitudinal direction of the main body and fixed to a contact portion between the denture and a wall of the oral cavity; An attachment member comprising:

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