JP6815068B2 - Manufacturing method of denture base, denture, denture base and denture - Google Patents

Description

The present invention relates to a denture base, a denture with a floor, a method for manufacturing a denture base, and a method for manufacturing a denture with a floor.

Most of the restorations and prostheses (inlays, partially covered crowns, fully covered crowns, bridges, removable partial dentures, fully dentures, implant superstructures, etc.) that are traditionally placed in the oral cavity during dental treatment It has been made by hand. In recent years, prosthetic tooth manufacturing using a CAD / CAM (Computer Aided Design and Computer Aided Manufacturing) system has been proposed. A dental CAD / CAM system is a series of systems that replaces part of a manufacturing process, including the design and processing of restorations and prostheses, with computer-controlled equipment. By introducing a CAD / CAM system in the manufacture of denture bases and dentures, there are merits that work efficiency can be improved and quality variation can be suppressed.

As a technique relating to a method for manufacturing a denture base and a denture with a bed using a CAD / CAM system, for example, there is one described in Patent Document 1. Patent Document 1 describes a method for manufacturing a denture base and a denture with a floor, including the following steps. (A) The process of photographing the old denture and acquiring the imaging data of the old denture, (b) Displaying the three-dimensional image of the old denture based on the imaging data of the old denture, and artificially based on the data of only the artificial tooth. A process of displaying a three-dimensional image of a tooth and acquiring three-dimensional shape information of the new denture based on the three-dimensional image of the new denture displayed by the three-dimensional image of the old denture and the three-dimensional image of the artificial tooth. c) The process of removing the artificial tooth from the new denture in the displayed three-dimensional image of the new denture and acquiring the three-dimensional shape information of the denture base of the new denture based on the displayed three-dimensional image of the denture base. (D) A step of forming a resin into a denture base having a predetermined shape based on three-dimensional shape information of the denture base of a new denture, (e) An artificial tooth is placed in a recess for artificial tooth arrangement formed on the surface of the denture base. The process of bonding.

International Publication No. 2010/058822 Pamphlet

Manufacture of a denture base and a denture with a bed using a CAD / CAM system is performed, for example, by the following procedure. (Step 1) A ready-made artificial tooth is scanned with an optical scanner, and artificial tooth shape data indicating the three-dimensional shape of the artificial tooth is taken into a CAD / CAM system. (Step 2) A three-dimensional model of a denture with a floor is created using artificial tooth shape data on a CAD / CAM system. (Step 3) By deleting the shape portion corresponding to the artificial tooth shape data from the three-dimensional model of the denture, the denture base shape data showing the three-dimensional shape of the denture base is created. (Step 4) NC (numerical control) data is created based on the denture base shape data. (Step 5) A denture base is manufactured by cutting a resin block using an NC machine tool to which NC data is input. (Step 6) An artificial tooth is attached to the socket portion of the manufactured denture base. The socket portion is a recessed portion that receives an artificial tooth of the denture base.

On the other hand, the conventional method for manufacturing a denture without using a CAD / CAM system has been to fill a mold in which artificial teeth are arranged with a resin as a denture base material. In this case, in order to improve the adhesion between the denture base material and the artificial tooth, an artificial tooth having a recess (dent or hole) in the basal plane may be used. FIG. 1 is a diagram showing a ready-made artificial tooth 1 having a recess 2 in the basal plane P. The basal plane P is a joint surface of the artificial tooth 1 with the denture base. When manufacturing a denture with a floor by a conventional manufacturing method that does not use a CAD / CAM system, by forming a recess 2 in the basal plane P of the artificial tooth 1, the denture base material enters the recess 2 and becomes an anchor. Since the effect can be obtained, the adhesion between the denture base material and the artificial tooth 1 is improved.

As described above, the type of artificial tooth 1 having the recess 2 in the basal plane P can be suitably used for manufacturing a conventional denture with a floor without using a CAD / CAM system, and therefore, many of them are still in circulation. However, in the recent production of denture bases and dentures using the CAD / CAM system, the artificial tooth shape data incorporated into the CAD / CAM system in the above (step 1) is transferred to the basal plane as shown in FIG. When it is created using a type of artificial tooth having a recess, the following problems occur. That is, the denture base shape data created in the above (step 3) is data indicating a shape including a convex portion corresponding to the concave portion formed on the basal plane of the ready-made artificial tooth. Even if NC data is created based on the artificial tooth bed shape data showing the shape including such a convex portion, and the NC data is input to the NC machine tool to manufacture the artificial tooth bed by cutting, the tool of the NC machine tool. May interfere with the above-mentioned convex portion of the prosthesis base material to generate cutting residue. In this case, it is not possible to manufacture the denture base according to the denture base shape data, and it is necessary to manually adjust the portion where the cutting residue is generated. Further, even if the denture base can be manufactured according to the denture base shape data, when the artificial tooth is attached to the denture base, the artificial tooth interferes with the convex portion and the artificial tooth is fitted into the socket portion. It may not be possible.

The present invention has been made in view of the above points, and is cut in the manufacture of a denture base and a denture including a step of designing a denture base based on shape data of an artificial tooth having a recess on the basal plane. The purpose is to prevent the remaining occurrence and prevent interference with artificial teeth.

According to the first aspect of the present invention, a step of acquiring artificial tooth shape data indicating a three-dimensional shape of an artificial tooth having a recess on the denture surface and the denture shape of the artificial tooth shape indicated by the artificial tooth shape data. A step of creating a modified artificial tooth shape data in which the artificial tooth shape data is modified so as to alleviate the unevenness of the surface corresponding to the above, and a step of creating a three-dimensional model of a denture with a floor using the modified artificial tooth shape data. And, by deleting the shape portion corresponding to the modified artificial tooth shape data from the three-dimensional model of the denture with a floor, the denture having a recessed portion having a bottom surface reflecting the shape of the basal surface in which the unevenness is alleviated. A method for manufacturing a denture base including a step of creating denture base shape data showing a three-dimensional shape of the denture and a step of manufacturing a denture base based on the denture base shape data is provided.

According to the second aspect of the present invention, in the step of creating the modified artificial tooth shape data, the basal plane of the artificial tooth shape is filled by filling at least a part of the portion corresponding to the concave portion of the artificial tooth shape. A manufacturing method according to a first aspect of alleviating the unevenness of the surface corresponding to the above is provided.

According to the third aspect of the present invention, in the step of creating the modified artificial tooth shape data, the surface corresponding to the basal plane of the artificial tooth shape is cut out to correspond to the basal plane of the artificial tooth shape. A manufacturing method from the first aspect of alleviating surface irregularities is provided.

According to the fourth aspect of the present invention, in the step of creating the modified artificial tooth shape data, the artificial tooth shape data is modified so that the surface of the artificial tooth shape corresponding to the basal plane becomes flat. A manufacturing method according to a second or third aspect is provided.

According to the fifth aspect of the present invention, the step of performing a cutting simulation on the denture base shape data to determine the presence or absence of the cutting residue is further included, and there is no cutting residue in the step of determining the presence or absence of the cutting residue. A manufacturing method from any one of the first to fourth viewpoints for modifying the artificial tooth shape data in the step of creating the modified artificial tooth shape data is provided.

According to the sixth aspect of the present invention, a step of manufacturing a modified denture in which the artificial tooth is modified so as to alleviate the unevenness of the denture of the artificial tooth having a recess in the basal plane, and a step of manufacturing the modified denture. A step of acquiring modified artificial tooth shape data showing a three-dimensional shape, a step of creating a three-dimensional model of a denture using the modified artificial tooth shape data, and the modified artificial tooth from the three-dimensional model of the denture. By deleting the shape portion corresponding to the tooth shape data, the denture base shape data showing the three-dimensional shape of the denture base having a recess having a bottom surface reflecting the shape of the basal plane in which the unevenness is relaxed is created. A method for manufacturing a denture base including a step and a step of manufacturing the denture base based on the denture base shape data is provided.

According to the seventh aspect of the present invention, there is provided a manufacturing method according to the sixth aspect of alleviating the unevenness of the basal plane by filling the recess in the step of manufacturing the modified artificial tooth.

According to the eighth aspect of the present invention, there is provided a manufacturing method according to the sixth aspect, in which the unevenness of the basal plane is relaxed by cutting or grinding the basal plane in the step of manufacturing the modified artificial tooth.

According to the ninth aspect of the present invention, the NC machine tool to which the NC data is input is used in the step of manufacturing the denture base, further including the step of creating NC data based on the denture base shape data. A method for manufacturing the denture base from any one of the first to the eighth viewpoints is provided.

According to the tenth aspect of the present invention, in the step of manufacturing the denture base, any one of the first to the eighth to manufacture the denture base using a three-dimensional printer into which the denture base shape data is input. A manufacturing method from two viewpoints is provided.

According to the eleventh aspect of the present invention, there is provided a method for manufacturing a denture including a step of attaching an artificial tooth to a denture base manufactured by using the manufacturing method according to any one of the first to tenth viewpoints. To.

According to the twelfth aspect of the present invention, there is provided a denture base manufactured by using the manufacturing method according to any one of the first to tenth aspects.

According to the thirteenth aspect of the present invention, there is provided a bedded denture manufactured by using the manufacturing method according to the eleventh aspect.

According to the present invention, in the production of a denture base and a denture including a step of designing a denture base based on shape data of an artificial tooth having a recess on the basal plane, the generation of uncut residue is prevented and the artificial tooth is generated. It is possible to prevent interference with.

It is a figure which shows the shape of the ready-made artificial tooth used for manufacturing the denture base and the denture with a floor which concerns on embodiment of this invention. It is a block diagram which shows an example of the hardware composition of the CAD / CAM system used for manufacturing the denture base and the denture with a floor which concerns on embodiment of this invention. It is a manufacturing process flow chart which shows an example of the manufacturing method of the denture base and the denture with a floor which concerns on embodiment of this invention. It is a figure which shows an example of the artificial tooth shape shown by the artificial tooth shape data which concerns on embodiment of this invention. It is a figure which shows the modified artificial tooth shape which concerns on embodiment of this invention. It is a figure which shows the plurality of modified artificial tooth shapes which concerns on embodiment of this invention. It is a figure which shows the denture base shape shown by the denture base shape data which concerns on embodiment of this invention. It is a manufacturing process flow chart which shows the manufacturing method of the denture base and the denture with a floor which concerns on a comparative example. It is a figure which shows the denture base shape shown by the denture base shape data which concerns on a comparative example. It is a figure which shows the result of having performed the cutting simulation with respect to the denture base data created by using the manufacturing method which concerns on embodiment of this invention. It is a manufacturing process flow chart which shows the manufacturing method of the denture base and the denture with a floor which concerns on embodiment of this invention. It is a figure which shows the modified artificial tooth shape which concerns on embodiment of this invention. It is a manufacturing process flow chart which shows the manufacturing method of the denture base and the denture with a floor which concerns on embodiment of this invention. It is a manufacturing process flow chart which shows the manufacturing method of the denture base and the denture with a floor which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 2 is a block diagram showing an example of a hardware configuration of a CAD / CAM system 100 used for manufacturing a denture base and a denture with a floor according to an embodiment of the present invention.

The CAD / CAM system 100 is composed of a computer including an arithmetic processing unit 110, a main storage device 111, an input device 112, an output device 113, an auxiliary storage device 114, and an interface device 115, which are interconnected via a bus 120. There is.

The arithmetic processing unit 110 controls the entire CAD / CAM system 100 and executes the CAD program 200 and the CAM program 210 stored in the auxiliary storage device 114. The main storage device 111 has a storage area for temporarily storing a program or data being executed, and is composed of, for example, a RAM (Random Access Memory). The input device 112 includes, for example, a keyboard, a mouse, a tablet, and the like. As an example, the output device 113 includes a display, a printer, and the like.

The auxiliary storage device 114 is a non-volatile storage device such as a hard disk device, and the CAD program 200 and the CAM program 210 are stored in the auxiliary storage device 114. When the CAD program 200 and the CAM program 210 are provided by a portable recording medium such as a CD-ROM, or are provided via a network, these programs are assisted via the interface device 115. It can be installed in the storage device 114. As the CAD program 200, a commercially available CAD program can be used. As the CAM program 210, a commercially available CAM program can be used.

The user can design the denture base and the denture on the CAD / CAM system 100 by operating the input device 112 while checking the model output to the output device 113.

Hereinafter, a method for manufacturing a denture base and a denture with a floor using the CAD / CAM system 100 according to the embodiment of the present invention will be described. FIG. 3 is a manufacturing process flow chart showing an example of a method for manufacturing a denture base and a denture with a floor according to an embodiment of the present invention.

In step S1, the upper tray and the lower tray holding the impression material are inserted into the oral cavity of the patient to obtain impressions of the patient's upper and lower jaws, and subsequently, occlusion acquisition is performed by a conventional method.

In step S2, the shape and jaw position of the impression material held on the upper and lower trays taken out from the oral cavity of the patient are scanned with, for example, an optical scanner to show the three-dimensional shape of the maxillary and mandibular ridges. Shape data is created and imported into the CAD / CAM system 100. The ridge shape data is stored in the auxiliary storage device 114 of the CAD / CAM system 100.

In step S3, artificial tooth shape data showing the three-dimensional shape of the artificial tooth is created by scanning the ready-made artificial tooth with, for example, an optical scanner, and this is incorporated into the CAD / CAM system 100. The artificial tooth shape data is created for all the artificial teeth constituting the denture manufactured by using the manufacturing method according to the present embodiment, and is incorporated into the CAD / CAM system 100. The artificial tooth shape data is stored in the auxiliary storage device 114 of the CAD / CAM system 100.

FIG. 4 is a diagram showing an example of the artificial tooth shape 10 shown by the artificial tooth shape data taken into the CAD / CAM system 100 in step S3. The basal plane P1 of the artificial tooth shape 10 is a surface corresponding to the basal plane P of the ready-made artificial tooth 1 illustrated in FIG. The basal plane P1 of the artificial tooth shape 10 has a recess 11 corresponding to the recess 2 formed in the basal plane P of the ready-made artificial tooth 1.

In step S4, the CAD / CAM system 100 is used to modify the artificial tooth shape 10 so as to alleviate the unevenness on the basal surface P1 of the artificial tooth shape 10. As a result, modified artificial tooth shape data obtained by modifying the artificial tooth shape data acquired in step S3 is created. Specifically, the CAD / CAM system 100 is used to flatten the basal plane P1 by filling the recess 11 formed in the basal plane P1 of the artificial tooth shape 10 according to the curvature of the surroundings. FIG. 5 is a diagram showing an artificial tooth shape 10A modified by performing the above processing. As shown in FIG. 5, in the modified artificial tooth shape 10A, the recess 11 in the artificial tooth shape 10 before modification is filled, and the basal plane P1 is flat. The modified artificial tooth shape data created in this step S4 is data corresponding to the modified artificial tooth shape 10A. The modified artificial tooth shape data is created for all artificial teeth constituting the denture manufactured by using the manufacturing method according to the present embodiment. FIG. 6 is a diagram showing a plurality of modified artificial tooth shapes shown by the modified artificial tooth shape data created for each of the plurality of artificial teeth.

In step S5, a CAD / CAM system 100 is used to create a three-dimensional model of a denture with a floor. The arithmetic processing unit 110 displays the ridge shape indicated by the ridge shape data stored in the auxiliary storage device 114 on the display constituting the output device 113. The user arranges the modified artificial tooth shape indicated by the modified artificial tooth shape data created in step S4 on the jaw ridge shape displayed on the display. Then, by adding the gingival portion, a three-dimensional model of the denture with a floor is created.

In step S6, the CAD / CAM system 100 is used to delete the shape portion corresponding to the modified artificial tooth shape data from the three-dimensional model of the denture created in step S5 by a set operation (Boolean operation). As a result, denture base shape data showing the three-dimensional shape of the denture base is created. FIG. 7 is a diagram showing the denture base shape 20 represented by the denture base shape data created by the above processing. The denture base shape 20 has a plurality of socket portions (recessed portions) 21 formed by deleting the shape portion corresponding to the modified artificial tooth shape data from the three-dimensional model of the denture base. According to the manufacturing method according to the present embodiment, modified artificial tooth data in which artificial tooth shape data is modified so as to flatten the basal plane P1 is created, and the modified artificial tooth data is used to create a three-dimensional model of a denture with a floor. The bottom surface of the socket portion 21 of the denture base shape 20 is flat.

In step S7, the CAD / CAM system 100 is used to create NC data for manufacturing the denture base. That is, in this process, the arithmetic processing device 110 executes the CAM program 210 and generates NC data for causing the NC machine tool to manufacture the artificial tooth bed based on the artificial tooth bed shape data created in the process S6. NC data is data for instructing an NC machine tool of a tool type and shape, a machining site, machining conditions, a start point and end point of machining, a tool movement (tool path), and the like.

In step S8, the denture base is manufactured using the NC machine tool to which the NC data generated in step S7 is input. Based on the input NC data, the NC machine tool cuts the resin block, which is the material of the denture base, to form the mucosal surface, the polished surface, and the socket portion (dented portion) for receiving the artificial tooth. This produces a denture base.

In step S9, after applying an adhesive to the socket portion of the manufactured denture base, an artificial tooth is fitted into the socket portion. After that, the denture with a floor is completed by modifying the shape of the occlusal surface of the artificial tooth and surface processing to prevent dirt from adhering as necessary.

Here, FIG. 8 is a manufacturing process flow chart showing a manufacturing method of a denture base and a denture with a floor according to a comparative example. In FIG. 8, the same reference numerals are given to the same steps as the steps in the manufacturing process flow according to the embodiment of the present invention described above.

The manufacturing process flow according to the comparative example does not include the step S4 in the manufacturing process flow according to the embodiment of the present invention described above. That is, according to the manufacturing method according to the comparative example, the modified artificial tooth shape data is not created. Therefore, in step S5a of the manufacturing process flow according to the comparative example, a three-dimensional model of the denture with a floor is created by using the artificial tooth shape data acquired in step S3 as it is. That is, a three-dimensional model of a denture with a floor is created using unmodified artificial tooth shape data showing an artificial tooth shape 10 (see FIG. 4) having a recess 11 on the basal plane P1.

In step S6 of the manufacturing process flow according to the comparative example, the shape portion corresponding to the uncorrected artificial tooth shape data is deleted from the three-dimensional model of the denture created in step S5a by a set operation (Boolean operation). Denture base shape data is created. FIG. 9 is a diagram showing the denture base shape 20X shown by the denture base shape data according to the comparative example created by the above processing. The denture base shape 20X according to the comparative example has a plurality of socket portions (recessed portions) 21 formed by deleting the shape portion corresponding to the uncorrected artificial tooth shape data from the three-dimensional model of the denture base. According to the manufacturing method according to the comparative example, the convex portion 22 corresponding to the concave portion 11 formed in the basal surface P1 of the unmodified artificial tooth shape 10 is formed on the lower surface of the socket portion 21.

In step S7 of the manufacturing process flow according to the comparative example, NC data is created based on the artificial tooth bed shape data corresponding to the artificial tooth bed shape 20X, and in step S8, this NC data is input to the NC machine tool by cutting. Manufactures artificial tooth beds. However, the tool of the NC machine tool that operates based on the NC data may interfere with the portion of the denture base material corresponding to the convex portion 22, and a cutting residue may be generated. In this case, it is not possible to manufacture the denture base according to the denture base shape data created by using the CAD / CAM system 100, and it is necessary to manually adjust the portion where the cutting residue is generated.

The presence or absence of such a cutting residue can be predicted by executing a cutting simulation using a cutting simulator provided in the CAD / CAM system 100. The cutting simulator has a function of displaying a part where a cutting residue is generated by comparing a product model created by using the CAD / CAM system 100 with a model after cutting. FIG. 9 shows the results of a cutting simulation performed on the denture base shape data created in step S6 of the manufacturing process flow according to the comparative example. A commercially available NC VIEW was used as the cutting simulator. In FIG. 9, the high density portion (the portion surrounded by the broken line) of the gray scale is the portion where the cutting residue is generated. According to the manufacturing method according to the comparative example, a remarkable cutting residue was generated around the convex portion 22. Further, even if no cutting residue is generated, if the convex portion 22 is present on the bottom surface of the socket portion 21, the artificial tooth is convex on the denture base when the artificial tooth is attached to the denture base in step S9. There is a possibility that the artificial tooth cannot be fitted into the socket portion due to interference with the portion corresponding to the portion 22.

On the other hand, FIG. 10 is a diagram showing the result of performing a cutting simulation by NC VIEW on the denture base data created in step S6 of the manufacturing process flow according to the embodiment of the present invention. According to the manufacturing method according to the present embodiment, since the bottom surface of the socket portion 21 of the denture base shape 20 is flat, a portion that causes interference with the tool of the NC machine tool does not occur, and therefore a cutting residue is generated. There is no. Further, when the artificial tooth is attached to the denture base in step S9, the denture base and the artificial tooth do not interfere with each other.

As described above, according to the method for manufacturing a denture base and a denture with a floor according to the embodiment of the present invention, it is possible to prevent the occurrence of uncut parts and prevent interference with artificial teeth.

In the above description, in step S4, the case where the recess 11 is filled so that the basal plane P1 of the artificial tooth shape 10 becomes substantially flat is illustrated, but the basal plane P1 does not necessarily have to be flat. That is, in step S4, the recess 11 may be filled so as to alleviate the unevenness on the basal plane P1.

For example, the basal plane P1 may be partially flattened by filling a region of about half of the recess 11, and the remaining half of the recess 11 may be left as a recess. In this case, it is desirable to fill the side of the recess 11 where cutting residue is likely to occur. Further, when attaching the artificial tooth to the denture base, it is desirable to determine a portion to be left as a recess so that the denture base and the artificial tooth do not interfere with each other.

Further, the recess 11 may be filled so that the depth of the recess 11 becomes shallow. Even in this case, it is desirable to adjust the embedding condition of the recess 11 so that the cutting residue and the interference with the artificial tooth do not occur.

In this way, the basal surface P1 of the artificial tooth shape 10 is not made substantially completely flat, but the recess 11 is left so that the socket portion of the denture base manufactured in step S8 has the recess 11. Corresponding protrusions will be formed. If the convex part does not cause any uncut residue or interference with the artificial tooth, the convex part is formed in the socket part so that when the artificial tooth is attached to the denture base, the convex part is the base of the artificial tooth. Since it meshes with the concave portion formed on the surface, the alignment of the artificial tooth becomes easy.

FIG. 11 is a manufacturing process that can be applied when the modified artificial tooth data is created by partially filling the recess 11 of the artificial tooth shape 10 or filling the recess 11 so that the depth of the recess 11 becomes shallow in step S4. This is an example of flow. In the manufacturing process flow shown in FIG. 11, a step S10 is added in which a cutting simulation is performed on the denture base shape data created in the step S6 to determine whether or not a cutting residue is generated. If it is determined in step S10 that a cutting residue is generated, the process returns to step S4 and the process of filling the recess 11 of the artificial tooth shape 10 is repeated. On the other hand, if it is determined in step S10 that no cutting residue is generated, the process proceeds to step S7, and NC data is created based on the denture base shape data. According to such a manufacturing process flow, it is possible to reliably prevent the occurrence of uncut parts even when the basal plane P1 of the artificial tooth shape 10 is not substantially completely flattened.

[Second Embodiment]
The manufacturing process flow of the denture base and the denture with a floor according to the second embodiment follows the manufacturing process flow according to the first embodiment shown in FIG. In the manufacturing method according to the second embodiment, the method of creating the modified artificial tooth shape data is different from that of the first embodiment. That is, in the manufacturing method according to the first embodiment, in step S4, the unevenness of the basal plane P1 was alleviated by filling at least a part of the recess 11 of the artificial tooth shape 10 (see FIG. 3) before modification. On the other hand, in the manufacturing method according to the second embodiment, in step S4, the basal plane P1 of the artificial tooth shape 10 before modification is cut out using the CAD / CAM system 100 to expose a new basal plane. This alleviates or flattens the unevenness of the basal plane.

FIG. 12 is a diagram showing a modified artificial tooth shape 10B created in step S4 according to the second embodiment. As shown in FIG. 12, the modified artificial tooth shape 10B is created by cutting out the basal plane P1 of the artificial tooth shape 10 before modification and exposing a new basal plane P2. FIG. 12 shows a case where the original basal plane P1 is cut off so that the new basal plane P2 becomes flat.

In this way, even when the basal plane is flattened by cutting out the basal plane P1 of the artificial tooth shape 10 before modification and exposing a new basal plane P2, the denture base shape indicated by the denture base shape data Since the bottom surface of the socket portion is flat and no portion that causes interference with the tool of the NC machine tool is generated, no cutting residue is generated. Further, when the artificial tooth is attached to the denture base, interference between the denture base and the artificial tooth does not occur.

It is not necessary that the new basal plane P2 is a substantially completely flat surface. That is, the recess 11 may remain in the new basal plane P2. In this case, it is preferable to apply the manufacturing process flow shown in FIG. 11 including the step S10 for determining whether or not a cutting residue is generated.

[Third Embodiment]
FIG. 13 is a manufacturing process flow chart showing a method for manufacturing a denture base and a denture with a floor according to a third embodiment of the present invention. In the manufacturing method according to the third embodiment, the modified artificial tooth shape data is not obtained by modifying the artificial tooth shape data, but the modified artificial tooth is produced by modifying the shape of the ready-made artificial tooth. The point of obtaining tooth shape data is different from the manufacturing method according to the first and second embodiments described above.

Since the steps S11 and S12 in the manufacturing process flow according to the third embodiment are the same as the steps S1 and S2 in the manufacturing process flow (see FIG. 2) according to the first embodiment, duplicate description is omitted. To do.

In step S13, a resin or the like is embedded in the recess 2 formed in the basal plane P of the ready-made artificial tooth 1 (see FIG. 1) to flatten the basal plane P. As a result, a modified artificial tooth in which the shape of the ready-made artificial tooth 1 is modified is manufactured.

In step S14, by scanning the modified artificial tooth manufactured in step S13 with, for example, an optical scanner, modified artificial tooth shape data showing the three-dimensional shape of the modified artificial tooth is created and imported into the CAD / CAM system 100. .. The modified artificial tooth shape data is created for all artificial teeth constituting the denture manufactured by using the manufacturing method according to the present embodiment, and is incorporated into the CAD / CAM system 100. The modified artificial tooth shape data is stored in the auxiliary storage device 114 of the CAD / CAM system 100.

In step S15, a CAD / CAM system 100 is used to create a three-dimensional model of a denture with a floor. The arithmetic processing unit 110 displays the ridge shape indicated by the ridge shape data stored in the auxiliary storage device 114 on the display constituting the output device 113. The user arranges the artificial tooth shape indicated by the modified artificial tooth shape data acquired in the step S14 on the jaw ridge shape displayed on the display. Then, by adding the gingival portion, a three-dimensional model of the denture with a floor is created.

Since steps S16 to S19 are the same as steps S6 to S9 in the manufacturing process (see FIG. 2) according to the first embodiment, duplicate description will be omitted.

As described above, in the manufacturing method according to the third embodiment, the modified artificial tooth having the shape of the ready-made artificial tooth 1 modified by filling the recess 2 of the basal plane P is produced, and the three-dimensional shape of the modified artificial tooth is formed. The modified artificial tooth shape showing the above is incorporated into the CAD / CAM system 100. Even with such a method, the bottom surface of the socket portion of the denture base shape indicated by the denture base shape data becomes flat as in the case of applying the manufacturing method according to the first and second embodiments, and the tool of the NC machine tool. Since there is no portion that causes interference with, no cutting residue is generated. Further, when the artificial tooth is attached to the denture base, interference between the denture base and the artificial tooth does not occur.

The basal plane of the modified artificial tooth manufactured in step S13 does not necessarily have to be completely flat. That is, in step S13, the recesses of the ready-made artificial teeth may be filled so as to alleviate the unevenness on the basal plane. For example, the basal plane P may be partially flattened by filling about half the area of the recess 2 of the ready-made artificial tooth 1 (see FIG. 1), and the remaining half of the recess 2 may be left as a recess. Good. In this case, it is desirable to fill the side of the recess 2 where cutting residue is likely to occur. Further, when attaching the artificial tooth to the denture base, it is desirable to determine a portion to be left as a recess so that the denture base and the artificial tooth do not interfere with each other.

Further, the recess 2 may be filled so that the depth of the recess 2 of the ready-made artificial tooth 1 becomes shallow. Even in this case, it is desirable to adjust the embedding condition of the recess 2 so as not to cause the cutting residue or the interference with the artificial tooth.

In this way, when leaving unevenness on the basal plane of the modified artificial tooth, cutting is performed by performing a cutting simulation on the denture base shape data created in step S16, following the example of the manufacturing process flow shown in FIG. It is preferable to add a step of determining whether or not a residue is generated. If it is determined in the determination process that a cutting residue is generated, the process returns to step S13, and the correction artificial tooth is manufactured again.

Further, in the above description, the case where resin or the like is embedded in the recess 2 formed in the basal plane P of the ready-made artificial tooth 1 to flatten the basal plane P is illustrated, but the present invention is not limited to this embodiment. .. For example, the basal plane P may be flattened by cutting or grinding the basal plane P of the ready-made artificial tooth 1. Even in this case, the basal plane of the modified artificial tooth does not necessarily have to be completely flat.

[Fourth Embodiment]
FIG. 14 is a manufacturing process flow chart showing a method for manufacturing a denture base and a denture with a floor according to a fourth embodiment of the present invention. The manufacturing method according to the fourth embodiment is different from the manufacturing method according to the first to third embodiments in that an NC machine tool is used for manufacturing the denture base, but a three-dimensional printer is used.

The steps S21 to S26 and S28 in the manufacturing process flow according to the fourth embodiment are the same as the steps S1 to S6 and S9 in the manufacturing process flow (see FIG. 2) according to the first embodiment. , Duplicate description is omitted.

In step S27, a denture base is manufactured using a three-dimensional printer into which the denture base shape data created in step S26 is input. The three-dimensional printer is a laminated modeling device that models by laminating materials layer by layer based on shape data created by using the CAD / CAM system 100. The three-dimensional printer that can be used in this step may employ any of a stereolithography method, a powder sintering lamination method, a fused deposition modeling method, and an inkjet method.

When the denture base is manufactured using a three-dimensional printer, there is no problem corresponding to the cutting residue when using an NC machine tool, but the problem of interference between the denture base and the artificial tooth still remains. .. According to the manufacturing method according to the present embodiment, the bottom surface of the socket portion of the denture base is flat, so that interference between the denture base and the artificial tooth can be prevented.

Even when the modified artificial tooth shape data is obtained by manufacturing the modified artificial tooth in which the shape of the ready-made artificial tooth is modified as in the third embodiment, the denture base is manufactured by using the three-dimensional printer. It is possible.

1 Artificial tooth 2 Recesses 10, 10A, 10B Artificial tooth shape 11 Recesses 20, 20X Denture base shape 21 Socket part 22 Convex part 100 CAD / CAM system 110 Computational processing unit 111 Main storage device 112 Input device 113 Output device 114 Auxiliary storage device 115 Interface device 120 Bus 200 CAD program 210 CAM program P Base surface of artificial tooth P1 Base surface of artificial tooth shape P2 New base surface of artificial tooth shape

Claims (11)

The process of acquiring artificial tooth shape data showing the three-dimensional shape of an artificial tooth having a recess on the basal plane, and
A step of creating modified artificial tooth shape data in which the artificial tooth shape data is modified so as to alleviate the unevenness of the surface corresponding to the basal plane of the artificial tooth shape indicated by the artificial tooth shape data.
The process of creating a three-dimensional model of a denture with a floor using the modified artificial tooth shape data, and
A denture base having a recess having a bottom surface that reflects the shape of the basal plane in which irregularities are alleviated by deleting the shape portion corresponding to the modified artificial tooth shape data from the three-dimensional model of the denture with a floor. The process of creating denture base shape data showing a three-dimensional shape,
The process of manufacturing the denture base based on the denture base shape data and
Method of manufacturing a denture base including. Claim that in the step of creating the modified artificial tooth shape data, the unevenness of the surface of the artificial tooth shape corresponding to the basal plane is alleviated by filling at least a part of the portion corresponding to the concave portion of the artificial tooth shape. The manufacturing method according to 1. The first aspect of the present invention, wherein in the step of creating the modified artificial tooth shape data, the surface of the artificial tooth shape corresponding to the basal surface is cut off to alleviate the unevenness of the surface of the artificial tooth shape corresponding to the basal surface. Manufacturing method. The production according to claim 2 or 3, wherein in the step of creating the modified artificial tooth shape data, the artificial tooth shape data is modified so that the surface of the artificial tooth shape corresponding to the basal plane becomes flat. Method. Further including a step of performing a cutting simulation on the denture base shape data to determine the presence or absence of cutting residue.
Any one of claims 1 to 4 for modifying the artificial tooth shape data in the step of creating the modified artificial tooth shape data so that it is determined that there is no cutting residue in the step of determining the presence or absence of the cutting residue. The manufacturing method according to item 1. A process of manufacturing a modified artificial tooth in which the artificial tooth is modified so as to alleviate the unevenness of the basal surface of the artificial tooth having a recess on the basal surface.
The process of acquiring the modified artificial tooth shape data showing the three-dimensional shape of the modified artificial tooth, and
The process of creating a three-dimensional model of a denture with a floor using the modified artificial tooth shape data, and
A denture base having a recess having a bottom surface that reflects the shape of the basal plane in which irregularities are alleviated by deleting the shape portion corresponding to the modified artificial tooth shape data from the three-dimensional model of the denture with a floor. The process of creating denture base shape data showing a three-dimensional shape,
The process of manufacturing the denture base based on the denture base shape data and
Method of manufacturing a denture base including. The manufacturing method according to claim 6, wherein in the step of manufacturing the modified artificial tooth, the unevenness of the basal plane is alleviated by filling the recess. The manufacturing method according to claim 6, wherein in the step of manufacturing the modified artificial tooth, the unevenness of the basal plane is alleviated by cutting or grinding the basal plane. Further including a step of creating NC data based on the denture base shape data,
The manufacturing method according to any one of claims 1 to 8, wherein in the step of manufacturing the denture base, the denture base is manufactured using an NC machine tool to which the NC data is input. The manufacturing method according to any one of claims 1 to 8, wherein in the step of manufacturing the denture base, the denture base is manufactured by using a three-dimensional printer into which the denture base shape data is input. A method for manufacturing a denture including a step of attaching an artificial tooth to a denture base manufactured by using the manufacturing method according to any one of claims 1 to 10.