Partial denture production method, program and partial denture

Abstract

An object of the present invention is to provide a partial denture or the like that has higher strength than conventional dentures, even in small parts such as springs. [Solution] A partial denture production method for producing a partial denture 1 having a base 5 that serves as a base for supporting artificial teeth 3 and fasteners that fasten to teeth in the oral cavity, the partial denture production method including a cutting step for cutting out the base and the fasteners as a single unit from a metal material or a PEEK material. According to the present invention, it is possible to provide a partial denture etc. that is stronger than conventional ones and is resistant to breakage even when grinding or clenching teeth, even in fine parts such as spring parts.

Description

[Technical field]

[0001] The present invention relates to a partial denture production method, a program, and a partial denture, and in particular to a partial denture production method for producing a partial denture having a base portion that serves as a foundation for supporting artificial teeth and fasteners that are fastened to the teeth in the oral cavity. [Background technology]

[0002] 8 is a diagram illustrating a conventional partial denture 21, and shows a state in which a plurality of partial dentures 21 are attached, as viewed from (a) the front, (b) the left side, and (c) the palate. In general, a partial denture 21 comprises artificial teeth 23 that are placed in the area where natural teeth are missing, a base portion 25 that supports the artificial teeth 23, and a spring portion 27 fixed to the base portion 25. Such a partial denture 21 is attached by hooking the spring portion 27 onto a remaining tooth 29 close to the area where natural teeth are missing (Patent Document 1).

[0003] As shown in FIG. 8, in a conventional partial denture 21, the artificial teeth 23 and base portion 25 are generally made of resin, and the spring portion 27 is generally made of a metal such as cobalt chrome or nickel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-142504 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional partial dentures are known to be easily damaged by teeth grinding and clenching, and a particular issue is that soft materials such as resin and thin components such as springs are easily broken.

[0006] Therefore, an object of the present invention is to provide a partial denture or the like that has higher strength than conventional dentures, even in small parts such as springs. [Means for solving the problem]

[0007] A first aspect of the present invention is a partial denture production method for producing a partial denture having a base portion that serves as a base for supporting artificial teeth and fasteners that are fastened to the teeth in the oral cavity, the partial denture production method including a cutting step in which the base portion and the fasteners are machined as a single unit from metal material or PEEK material.

[0008] A second aspect of the present invention is the partial denture production method according to the first aspect, wherein in the cutting step, in addition to the base and the fasteners, the artificial teeth are also cut out as a single unit.

[0009] A third aspect of the present invention is a method for producing a partial denture according to the first or second aspect, wherein the metal material or the PEEK material has at least two surfaces, a first surface and a second surface which is different from the first surface, and in the cutting step, the metal material or the PEEK material is machined from the first surface and the second surface.

[0010] A fourth aspect of the present invention is a method for producing a partial denture according to any one of the first to third aspects, wherein in the cutting step, the denture is cut out from a metal material containing titanium in its composition.

[0011] A fifth aspect of the present invention is the method for producing a partial denture according to the fourth aspect, wherein the metal material is a titanium-nickel alloy.

[0012] A sixth aspect of the present invention is the method for producing a partial denture according to the fourth or fifth aspect, wherein a blade of a cutting machine used in the cutting step is fixed by an electromagnetic lock.

[0013] A seventh aspect of the present invention is a partial denture production method according to any one of the second to sixth aspects, further comprising a data creation step of creating shape data of the partial denture prior to the cutting step, the data creation step including at least an individual data creation step of individually creating artificial tooth data which is shape data of the artificial tooth or an abutment for an artificial tooth, and base data which is shape data of the base, and a data integration step of integrating the artificial tooth data and the base data to obtain partial denture data, and in the cutting step, the partial denture is cut out based on the partial denture data.

[0014] An eighth aspect of the present invention is a program for causing a computer to execute the data creation step of the seventh aspect.

[0015] A ninth aspect of the present invention is a partial denture comprising a base portion which serves as a base for supporting artificial teeth and fasteners which are fastened to the teeth in the oral cavity, wherein the base portion and the fasteners are made of the same metal material or PEEK material and are of an integral structure with no joints made of other materials between them.

[0016] A tenth aspect of the present invention is the partial denture of the ninth aspect, further comprising the artificial teeth as described above, wherein the artificial teeth and the base portion are of an integral structure with no joints between them and are made of the same metal material or PEEK material.

[0017] An eleventh aspect of the present invention is the partial denture of the tenth aspect, wherein the artificial tooth has an abutment made of the metal material or the PEEK material, and an artificial tooth cover made of resin or ceramic that covers the abutment.

[0018] A twelfth aspect of the present invention is the partial denture according to any one of the ninth to eleventh aspects, further comprising a bridging portion connecting portions of the base portion that contact non-adjacent teeth.

[0019] A thirteenth aspect of the present invention is a partial denture according to the twelfth aspect, wherein the bridging portion has flat first and second flat portions, and a bridging connection portion that connects the first and second flat portions and is thicker than the first and second flat portions.

[0020] A fourteenth aspect of the present invention is the partial denture according to the twelfth or thirteenth aspect, which is for use in the upper jaw, and the bridge portion is formed so as to fit along the inside of the palate.

[0021] A fifteenth aspect of the present invention is a partial denture according to the twelfth or thirteenth aspect, which is for use in the lower jaw, and the bridge portion is formed so as to fit along the inside of the gums of the lower jaw.

[0022] A sixteenth aspect of the present invention is a partial denture according to any one of the eighth to fifteenth aspects, which is made of the metal material containing titanium in its composition. Effect of the Invention

[0023] In conventional dental technology, the casting process used to process metal results in air bubbles called casting defects, which reduces the strength of the material. This makes it difficult to process thin fasteners with sufficient strength.

[0024] According to each aspect of the present invention, it is possible to provide a partial denture or the like that is free from the risk of casting defects, has an integral structure in which the base and spring parts have no joints between them, and is made of the same metal material or PEEK material. Therefore, it is possible to provide a partial denture or the like that is stronger than conventional ones and is resistant to breakage even in fine parts such as the spring parts due to teeth grinding or clenching.

[0025] If a casting method were used to manufacture partial dentures, if the finished product was thick, the mold would also need to be considerably thicker. This would increase costs and make the method unrealistic. On the other hand, it would be possible to manufacture the base and artificial teeth separately, using metal or PEEK materials, and then attach them together using resin or other materials. However, there is a risk that the adhesive part will come off due to teeth grinding or clenching.

[0026] Therefore, according to the second or ninth aspect of the present invention, the entire partial denture has a one-piece structure and is made of the same metal material or PEEK material, making it possible to provide a partial denture, etc. with even higher strength.

[0027] Conventional artificial dentures were provided in a range of standardized sizes, which did not necessarily fit the user perfectly. As a result, when artificial dentures were used, the bite alignment was poor, resulting in reduced biting force and wear.

[0028] In contrast, according to the second or ninth aspect of the present invention, it is possible to provide a custom-made denture. This makes it easy to provide an artificial denture with strong occlusal force. In addition, it is possible to prevent wear by improving the occlusion.

[0029] In addition, when cutting out the artificial teeth integrally with the base and fasteners, a complicated cutting process is required. Therefore, according to the third aspect of the present invention, it becomes easy to cut out the partial denture including the artificial teeth integrally by using a metal material or a PEEK material.

[0030] Titanium has properties suitable for use as a dental material, such as high strength, light weight, biocompatibility, and corrosion resistance.

[0031] However, in the dental laboratory industry, where manual labor is the norm, using titanium, known as one of the most difficult metals to process, as a material for fasteners was not even considered an option.

[0032] Titanium is generally melted with a high-frequency arc and poured into a mold to be processed as a casting. However, in conventional dental technology, the casting process used to process metals results in air bubbles called casting cavities, which reduce the strength of the material. For this reason, it has been difficult to use titanium for thin, narrow parts such as springs.

[0033] Therefore, according to the fourth or fifteenth aspect of the present invention, by machining the partial denture as a single piece from a material containing titanium in its composition, it is possible to provide a partial denture that is stronger, lighter, and has superior biocompatibility and corrosion resistance than conventional partial denture.

[0034] Furthermore, according to the fifth aspect of the present invention, by using a shape memory alloy, it becomes easier to provide a partial denture that is lightweight yet has excellent shape-retaining properties.

[0035] In particular, according to the sixth aspect of the present invention, it is possible to produce partial dentures using a digital processing machine even if the material contains a hard metal such as titanium, which is hard and has a large recoil when cut, making it difficult to cut finely by hand.

[0036] Traditionally, analog processing has been the norm in the dental laboratory industry, and the creation of shape data for partial dentures using CAD / CAM has not been widespread, leaving a lot of room for innovation in the digital processing of partial dentures. In particular, the creation of data needed to carve out the complex shapes that combine the artificial teeth and base from metal material was an unexplored field.

[0037] Therefore, according to the seventh aspect of the present invention, it is possible to manufacture a one-piece partial denture using a digital processing machine by using CAD / CAM.

[0038] Furthermore, according to the eleventh aspect of the present invention, it is possible to provide a false tooth that has the strength of a metal denture and has a natural appearance that is indistinguishable from the user's remaining teeth.

[0039] Furthermore, if the artificial tooth cover is damaged, only the artificial tooth cover needs to be replaced, making it possible to repair and maintain the false tooth portion more simply and quickly than before.

[0040] In addition, conventional partial dentures cover a large part of the inside of the gums with resin to provide a solid base. This causes a significant sense of discomfort to the wearer, as the tongue frequently touches the resin. Also, the fact that a large part of the gums is covered with resin is one of the causes of taste disorders.

[0041] According to the twelfth aspect of the present invention, by connecting distant parts of the base with bridges, it is possible to make use of the elasticity of metal and PEEK materials to impart elasticity to the entire partial denture and maintain its strength. This makes it unnecessary to form a thick base on the inside of the gums, and it is possible to expose the gums as much as possible. This makes it difficult for the tongue to hit the base of the partial denture, and it is possible to reduce the discomfort in the user's mouth.

[0042] Furthermore, by reducing the thickness of the floor, it is possible to maintain the texture of the food and drink, including its heat, as much as possible, and reduce taste disorders.

[0043] Furthermore, according to the thirteenth aspect of the present invention, it becomes easy to achieve both elasticity and strength in the crosslinked portion.

[0044] Furthermore, according to the fourteenth or fifteenth aspect of the present invention, it becomes easy to simultaneously maintain the strength of the partial denture and expose the mucous membrane in the oral cavity as much as possible. [Brief description of the drawings]

[0045] [Figure 1] FIG. 1 is a diagram showing an overview of a partial denture according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a diagram showing an outline of a flow of a partial denture production method according to an embodiment of the present invention. [Diagram 3] FIG. 11 is a diagram showing individual data in an embodiment of the present invention. [Figure 4] Titanium disks used to machine partial dentures, (a) front and (b) back views. [Diagram 5] FIG. 2 is a diagram showing an outline of a partial denture according to another embodiment of the present invention. [Figure 6] 13A and 13B are diagrams showing an image of how a partial denture according to Example 3 is worn, in which (a) is an image of the upper jaw side, and (b) is an image of the lower jaw side. [Figure 7] 13A and 13B are diagrams illustrating a dental implant according to Example 4, in which (a) is an image of the metal abutment as viewed from inside the oral cavity, (b) is an image of the abutment as viewed from outside the oral cavity, and (c) is an example of an artificial tooth cover. [Figure 8] FIG. 1 is a diagram illustrating a conventional partial denture. [Figure 9] FIG. 1 shows an image of how a conventional partial denture is worn, (a) showing the upper jaw side, and (b) showing the lower jaw side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. EXAMPLES

[0047] Fig. 1 is a diagram showing an outline of a partial denture 1 according to this embodiment (an example of the "partial denture" described in the claims of the present application). In Fig. 1, the partial denture 1 is for the upper jaw and is shown attached to a dental model.

[0048] The partial denture 1 comprises an artificial tooth 3 (an example of an "artificial tooth" as described in the claims), a base portion 5 (an example of a "base portion" as described in the claims), and a spring portion 7 (an example of a "fastener" as described in the claims).

[0049] The base part 5 is a part that serves as a base for supporting the artificial teeth. The spring part 7 extends from the base part 5 and hooks onto the remaining teeth remaining in the oral cavity to fix the partial denture 1. In Fig. 1, a remaining tooth model 9 is shown using a dental cast.

[0050] Conventional partial dentures were weak because the artificial teeth, base, and spring parts were each manufactured as separate parts and bonded together with resin or other materials.

[0051] In the partial denture 1 according to this embodiment, the artificial teeth 3, the base portion 5, and the spring portion 7 are of an integral structure with no joints between them, and are made of the same metal material. In particular, a material containing titanium in its composition is suitable as the metal material. Furthermore, a titanium-nickel alloy is more preferable.

[0052] This makes it possible to provide a partial denture etc. that is stronger than ever before, even in fine parts such as the spring portion 7. Because the entire partial denture 1 has an integral structure and is made of a material that contains titanium, it is possible to provide a partial denture that is stronger and lighter than ever before, and that has excellent biocompatibility and corrosion resistance.

[0053] The partial denture 1 of this embodiment has extremely high strength and can withstand teeth grinding, clenching, and the like.

[0054] In addition, by making the entire partial denture an integral structure, it is possible to make a partial denture that is thinner than conventional partial dentures that have a joint between the base and the artificial teeth. This makes it possible to provide partial dentures suitable for people whose bite gap between the upper and lower jaws is shorter than the standard. Conversely, it is also possible to appropriately increase the bite height (bite up) for people whose standard artificial teeth are not tall enough.

[0055] FIG. 2 is a diagram showing an outline of the flow of a partial denture production method according to an embodiment of the present invention (an example of the "partial denture production method" described in the claims of the present application).

[0056] First, artificial teeth are virtually placed on the missing parts of the tooth mold on the CAD, and artificial tooth data is created by adjusting the bite (step ST01). Next, the designed base data (an example of "base data" described in the claims of the present application) and the spring data are combined to create spring-integrated denture base data (step ST02). The artificial tooth data (an example of "artificial tooth data" described in the claims of the present application) is placed on the spring-integrated denture base data (step ST03), and the entire data is converted into STL data (polygon) + voxel data (data using regular lattice units in three-dimensional space) to complete partial denture data (an example of "partial denture data" described in the claims of the present application) (step ST04). Then, based on the partial denture data, a digital processing machine is used to cut the partial denture out of a block of titanium alloy (step ST05; an example of the "cutting step" described in the claims of the present application).

[0057] Fig. 3 is a diagram showing individual data in an embodiment of the present invention. As shown in Fig. 3, the artificial tooth data, base data, and spring data are created separately and then integrated later, making it possible to create highly accurate partial denture data.

[0058] Here, steps ST01 to ST04 as a whole are an example of a "data creation step" as set forth in the claims of the present application. Also, step ST01 and a part of step ST02 for creating floor data and spring data are an example of an "individual data creation step" as set forth in the claims of the present application. Furthermore, step ST04 is an example of a "data integration step" as set forth in the claims of the present application.

[0059] If one were to try to manufacture a one-piece partial denture like that of the present invention by pouring molten titanium into a mold and letting it harden, the mold would have to be significantly thicker to withstand the pressure, which is not practical.

[0060] In addition, titanium has a low specific gravity, so if a centrifugal casting machine is used to put it into a mold, it flies out. Even if it was tried to melt it and put it into the mold using arc processing with argon gas, it would not fit into the thin part because of its low specific gravity.

[0061] Furthermore, with conventional casting manufacturing methods, even though titanium was used, air bubbles called casting defects would form, reducing the strength of the product.

[0062] According to the partial denture production method of this embodiment, the entire partial denture has a one-piece structure cut out from a block of titanium alloy material, making it possible to provide a partial denture that is stronger, lighter, and has excellent biocompatibility and corrosion resistance than conventional partial denture.

[0063] 4 shows a titanium disk 31 from which a partial denture 37 is machined, as viewed from (a) the front surface 33 and (b) the back surface 35. The titanium disk 31 is made of a titanium-nickel alloy.

[0064] 4, when cutting out the artificial tooth, base part, and spring part as a single unit, it is difficult to process from one side. For example, by cutting out from both the front surface 33 and the back surface 35 opposite the front surface 33, it becomes easy to cut out partial denture 37, which has a complex structure in which the part to be cut is hidden when viewed from one side.

[0065] Furthermore, when cutting a partial denture from hard titanium metal material, the blade of a digital processing machine (an example of a "cutting machine" as described in the claims of this application) is fixed with an electromagnetic lock, which suppresses recoil during cutting and makes it possible to cut complex shapes such as the partial denture of the present invention with high precision. EXAMPLES

[0066] Next, an embodiment in which the base and the fasteners are integrated, but the artificial teeth are not integrated, will be described with reference to Fig. 5. Fig. 5 is a diagram showing an outline of a partial denture 11 (an example of the "partial denture" described in the claims of the present application) according to another embodiment of the present invention. In Fig. 5, the partial denture 11 is for the upper jaw, and is shown attached to a dental model.

[0067] The partial denture 11 comprises an artificial tooth (an example of an "artificial tooth" as described in the claims), a base portion 15 (an example of a "base portion" as described in the claims), and a spring portion 17 (an example of a "fastener" as described in the claims).

[0068] 5 does not show the artificial teeth, but shows instead the artificial teeth connection part 14 that connects the artificial teeth to the base part 15. That is, in this embodiment, the artificial teeth are not integrated with the base part 15, but are structured so that the artificial teeth, which are separate bodies, are attached to the artificial teeth connection part 14.

[0069] By making the artificial teeth separately and making them insertable, it is possible to repair only the artificial teeth, which makes the repair process easier than if the entire partial denture were one piece.

[0070] The partial denture 11 of this embodiment is also stronger than the conventional partial denture 11. Furthermore, since the structure does not use adhesive between the base 15 and the artificial teeth, it is possible to provide a partial denture suitable for people whose bite height between the upper and lower jaws is shorter than the standard, just like the partial denture 1 of embodiment 1. EXAMPLES

[0071] Next, an embodiment of a partial denture having a bridge portion in this embodiment will be described. Fig. 6 is a diagram showing an image of how the partial denture according to this embodiment is worn, showing (a) the upper jaw side and (b) the lower jaw side. Fig. 9 is a diagram showing an image of how a conventional partial denture is worn, showing (a) the upper jaw side and (b) the lower jaw side.

[0072] 9(a), in a conventional upper partial denture 151, a resin 154 covers a large part of the inside of the gums to provide a firm base. This causes a user's tongue to frequently hit the resin 154, resulting in a significant sense of discomfort. In addition, a large part of the gums is covered by the resin 154, which is one of the factors that cause taste disorders.

[0073] Similarly, referring to Fig. 9(b), a conventional lower partial denture 161 also has a resin 164 covering a large part of the inside of the gums. This causes a significant sense of discomfort, such as the tongue of the user frequently touching the resin 164. In addition, the resin 164 covering a large part of the gums is one of the factors that cause taste disorders.

[0074] In contrast, referring to FIG. 6(a), the upper partial denture 51 according to this embodiment further includes a bridge portion 53. The bridge portion 53 is formed so as to follow the inner side of the palate. The bridge portion 53 connects the distant portions (551, 552) of the base portion, thereby making it possible to provide elasticity to the partial denture 51 as a whole by utilizing the elasticity of the metal, and to maintain its strength. In addition, when the metal is a titanium-nickel alloy, it also has shape memory properties, making it easier to maintain its strength. This makes it unnecessary to form a thick base on the inside of the gums, and makes it possible to expose the mucous membrane of the gums 54 as much as possible. This makes it difficult for the tongue to come into contact with the base portion of the partial denture 51, and makes it possible to reduce the discomfort in the user's mouth.

[0075] Further, the bridging portion 53 has a flat first flat portion 571 and a flat second flat portion 572, and a bridging connection portion 59. The bridging connection portion 59 connects the first flat portion 571 and the second flat portion 572, and has a structure that is thicker than the first flat portion 571 and the second flat portion 572. By configuring the bridging portion 53 in this way, it becomes easy to achieve both elasticity and strength of the bridging portion.

[0076] Similarly, referring to FIG. 6(b), the lower partial denture 61 according to this embodiment further includes a bridge portion 63. The bridge portion 63 is formed so as to fit along the inside of the gums of the lower jaw. The bridge portion 63 connects the distant portions (651, 652) of the base portion, thereby making it possible to provide elasticity to the partial denture 61 as a whole and maintain its strength by utilizing the elasticity of the metal. This makes it unnecessary to form a thick base on the inside of the gums, and it becomes possible to expose the mucous membrane of the gums 64 as much as possible. This makes it difficult for the tongue to come into contact with the base portion of the partial denture 61, making it possible to reduce discomfort in the user's mouth. EXAMPLES

[0077] Furthermore, an embodiment using an artificial tooth cover will be described in this embodiment. Figure 7 is a diagram illustrating a dental implant according to this embodiment, (a) an image of a metal abutment seen from inside the oral cavity, (b) an image of the abutment seen from outside the oral cavity, and (c) an image of an artificial tooth cover.

[0078] 7(a) and 7(b), an artificial tooth 71 according to this embodiment has an abutment 73 and an artificial tooth cover 77. The abutment 73 is formed integrally with a base portion 75. Also, referring to Fig. 7(c), the artificial tooth cover 77 is made of resin or ceramic, and has a hole portion 79 for accommodating the abutment 73.

[0079] The artificial teeth of this embodiment make it possible to provide a false tooth that has the strength of a metal denture while having a natural appearance that is indistinguishable from the user's remaining teeth.

[0080] Moreover, if the artificial tooth cover 77 is damaged, only the artificial tooth cover 77 needs to be replaced, so repair and maintenance of the false tooth portion can be performed more easily and quickly than in the past.

[0081] Titanium is particularly advantageous in that it does not affect the sense of taste, has good thermal conductivity, and is very light. However, other materials than titanium may be used that are more desirable in terms of strength, plasticity, thermal conductivity, weight, etc. For example, PEEK material may be used instead of titanium for users with metal allergies. [Explanation of symbols]

[0082] 1: Partial denture, 3: Artificial teeth, 5: Base part, 7: Spring part, 9: Remaining tooth model, 11: partial denture, 14: artificial tooth connection part, 15: base part, 17: spring part, 19: remaining tooth model 21: Conventional partial denture, 23: Artificial teeth, 25: Base part, 27: Spring part, 29: Remaining tooth model 31: Titanium disc, 33: Surface, 35: Back, 37: Partial denture 51: partial denture, 53: bridge portion, 54: gums, 55: part of base portion, 571: first flat portion, 572: second flat portion, 59: bridge connection portion 61: Partial denture, 63: Bridge, 65: Part of base 71: partial denture, 73: abutment, 75: base, 77: artificial tooth cover, 79: hole 151: Conventional partial denture, 154: Resin 161: Conventional partial denture, 164: Resin

Claims

1. A method for producing a partial denture having a base portion that serves as a base for supporting an artificial tooth, comprising the steps of: The floor portion is integrally cut out from a metal material or a PEEK material, In the cutting step, the base portion is cut out so as to have a bridge portion connecting portions that contact non-adjacent teeth, The partial denture is a partial denture for use in the lower jaw, The base portion forms a seamless annular structure with the portion along the tooth row and the bridge portion, A method for producing a partial denture, wherein the bridge portion is formed to fit along the inside of the gums of the mandible.

2. 2. The method for producing a partial denture according to claim 1, wherein in the cutting step, fasteners for fastening the partial denture to teeth in the oral cavity are also cut out integrally with the base portion.

3. The cross-linking portion is A first flat portion and a second flat portion, The partial denture production method according to claim 1 , further comprising a bridge connecting portion that connects the first flat portion and the second flat portion and is thicker than the first flat portion and the second flat portion.

4. 3. The method for producing a partial denture according to claim 2, wherein in the cutting step, in addition to the base portion and the fasteners, the artificial teeth are also cut out as a single unit.

5. The metal material or the PEEK material is The first page and The substrate has at least two surfaces, the second surface being different from the first surface; The partial denture production method according to claim 4 , wherein in the cutting step, the metal material or the PEEK material is cut from the first surface and the second surface.

6. A method for producing a partial denture having a base portion that serves as a base for supporting artificial teeth, comprising the steps of: A cutting step of cutting the floor portion integrally from a metal material containing titanium in its composition, In the cutting step, the base portion is cut out so as to have a bridge portion connecting portions that contact non-adjacent teeth, A method for producing a partial denture, wherein the base portion forms a seamless annular structure with the portion that follows the dentition and the bridging portion.

7. The partial denture is a partial denture for use in the upper jaw, 7. The method of claim 6, wherein the bridge is formed to conform to an inside of the palate.

8. 7. The method of claim 6, wherein the metallic material is a titanium-nickel alloy.

9. 7. The method for producing a partial denture according to claim 6, wherein the blade of a cutting machine used in said cutting step is fixed by an electromagnetic lock.

10. In the cutting step, in addition to the base portion and the fasteners for fastening the partial denture to the teeth in the oral cavity, the artificial teeth are also cut out as a single unit, The method further includes a data creation step of creating shape data of the partial denture before the cutting step, The data creation step includes: an individual data creating step of individually creating at least artificial tooth data, which is shape data of the artificial tooth or an abutment of the artificial tooth, and base data, which is shape data of the base; A data integration step of integrating the artificial tooth data and the base data into partial denture data, 7. The partial denture production method according to claim 6, wherein in said cutting step, cutting is performed based on said partial denture data.

11. A program for causing a computer to execute the data creation step according to claim 10.

12. A partial denture having a base portion that serves as a base for supporting artificial teeth, A partial denture for the lower jaw. The floor is a one-piece structure made of the same metal material or PEEK material, A bridge portion is further provided as a part of the base portion, which connects the portions in contact with non-adjacent teeth, The base portion forms a seamless annular structure with a portion along the tooth row and the bridge portion, A partial denture, wherein the bridge portion is formed so as to fit along the inside of the gums of the lower jaw.

13. and a fastener for fastening the partial denture to teeth in the oral cavity.

13. The partial denture according to claim 12, wherein the base and the fasteners are made of the same metal material or PEEK material and are an integral structure with no joints made of other materials therebetween.

14. The artificial tooth is further provided.

14. The partial denture according to claim 13, wherein the artificial teeth and the base portion are of an integral structure with no joint therebetween and are made of the same metal material or PEEK material.

15. The artificial tooth is A support made of the metal material or the PEEK material; 15. The partial denture according to claim 12, further comprising an artificial tooth cover made of resin or ceramic for covering the abutment.

16. The cross-linking portion is A first flat portion and a second flat portion, 15. A partial denture according to any one of claims 12 to 14, comprising a bridge connecting portion connecting the first flat portion and the second flat portion and having a thickness greater than that of the first flat portion and the second flat portion.

17. A partial denture having a base portion that serves as a base for supporting artificial teeth, The floor portion is an integral structure made of a metal material containing titanium in its composition, A bridge portion is further provided as a part of the base portion, which connects the portions in contact with non-adjacent teeth, A partial denture, wherein the base portion forms a seamless annular structure with the portion that follows the dentition and the bridging portion.

18. A partial denture for use in the upper jaw, 18. The partial denture of claim 17, wherein the bridge is formed to conform to the inside of the palate.

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