WO2020066101A1

WO2020066101A1 - Method of manufacturing dental prosthesis

Info

Publication number: WO2020066101A1
Application number: PCT/JP2019/017421
Authority: WO
Inventors: 琢也滝沢; 雅史 ▲吉▼岡; 誠陸; 貴幸道井
Original assignee: 株式会社コアデンタルラボ横浜; 株式会社ジーシー
Priority date: 2018-09-28
Filing date: 2019-04-24
Publication date: 2020-04-02
Also published as: JPWO2020066101A1

Abstract

In order to provide a method for manufacturing a dental prosthesis comprising a metal bed and a resin bed, wherein the amount of time until completion can be shortened, the present invention comprises: a step of obtaining three-dimensional shape data for the interior of an oral cavity; a step of designing the shape of the metal bed on the basis of the obtained three-dimensional shape data; and producing, on the basis of the designed shape of the metal bed, at least two members having the shape of the metal bed.

Description

Manufacturing method of dental prosthesis

The present disclosure relates to a method for manufacturing a dental prosthesis, and more particularly, to a method for manufacturing a dental prosthesis having a metal floor and a resin floor, such as a partial denture.

There are several types of partial dentures depending on the means for holding the partial dentures in the oral cavity. One of them is a spring-type partial denture. The spring-type partial denture includes a metal floor called a metal spring, and a resin floor and a denture are arranged on the metal floor. The metal floor is provided with a hook-shaped portion called a clasp, and the clasp is hooked to the remaining teeth and fixed to hold the partial denture in the oral cavity.

For example, Patent Documents 1 and 2 disclose inventions relating to the production of such partial dentures. As disclosed in these documents, a conventional partial denture is manufactured by first forming a metal floor shape using wax or the like on a model and possibly using CAD, and then using a flowing wax casting technique. Is prepared. The method includes a step of installing the metal floor on a model and forming a resin floor and arranging artificial teeth.

JP-A-2015-213742 JP 2008-12182 A

わかる As can be seen from the above description, the conventional spring-type partial denture has a problem that it takes a long time to complete because the metal floor is made so that other parts are piled up after the metal floor is completed.

Accordingly, it is an object of the present disclosure to provide a method for manufacturing a dental prosthesis including a metal floor and a resin floor, which can shorten the time until completion.

One aspect of the present disclosure is a method of manufacturing a dental prosthesis including a metal floor and a resin floor, wherein a step of obtaining three-dimensional shape data in an oral cavity, and a method of manufacturing a metal prosthesis based on the obtained three-dimensional shape data. A method for manufacturing a dental prosthesis including a step of designing a floor shape, and a step of producing at least two members having a metal floor shape from the designed metal floor shape.

In the above manufacturing method, for at least one of the produced members, a step of forming a resin bed, a step of removing the member from the formed resin bed, and a step of producing the resin bed from which the member has been removed. Bonding the metal floor.

According to the present disclosure, since it is possible to prepare another part without waiting for the completion of the metal floor, the time until completion of the dental prosthesis can be shortened.

FIG. 1 is an external view of a dental prosthesis (partial denture) 10. FIG. 2 is a diagram showing the flow of the method S1 for manufacturing a dental prosthesis. FIG. 3 shows an intraoral model 15. FIG. 4 is a diagram illustrating a scene in which a wax model 16 having a metal floor shape is arranged on the intraoral model 15. FIG. 5 is an external view of the intermediate member 20. FIG. 6 is an external view of the intermediate member 25. FIG. 7 is a diagram conceptually showing a partial cross section of the intermediate member 25. FIG. 8 is an external view of the intermediate member 30. FIG. 9 is a diagram conceptually showing a partial cross section of the intermediate member 30. FIG. 10 is an external view of the intermediate member 35. FIG. 11 is a diagram conceptually showing a partial cross section of the intermediate member 35. FIG. 12 is a diagram illustrating the bonding between the metal floor 11 and the resin floor 12 (step S21).

Hereinafter, each embodiment will be described with reference to the drawings. The present invention is not limited to these modes.

First, the structure of the dental prosthesis to be manufactured will be described. FIG. 1 shows an external view of a partial denture 10 which is a dental prosthesis according to one example. The partial denture 10 according to this example has a metal floor 11, a resin floor 12, and an artificial tooth 13. In addition, the form provided in the partial denture to be manufactured is known, and is not limited to this example.

The metal bed 11 is a metal member serving as a basis of the partial denture 10, and is a member that holds the partial denture 10 in the oral cavity and supports the resin bed 12 and the artificial tooth 13. Therefore, the metal floor 11 includes a clasp 11a (sometimes called a spring), a floor part 11b, and a connecting part 11c (sometimes called a lingual bar, a balata bar, or the like).
The clasp 11a is a hook-shaped portion configured to be hooked on an existing tooth.
The floor 11b, which is indicated by a broken line in FIG.
The connecting portion 11c is a portion connecting the clasp 11a and the floor 11b.

The resin bed 12 is a part made of resin held on the floor part 11b of the metal floor 11, and is a part that supports the artificial teeth 13 and serves as an artificial gum in the partial denture 10. Therefore, the resin bed 12 has a shape and a color simulating the gum.

The artificial tooth 13 is an artificial tooth supported by the resin bed 12.

材料 A material constituting each part of the partial denture 10 is not particularly limited, and a known material used for the partial denture can be applied.

Next, a manufacturing method S1 of a partial denture according to one embodiment (hereinafter sometimes referred to as “manufacturing method S1”) will be described. FIG. 2 shows the flow of the manufacturing method S1. As can be seen from FIG. 2, the manufacturing method S1 includes steps S11 to S21, and after step S13, a step of manufacturing the metal floor 11 by steps S14 and S15, and steps S16 to S20. The step of producing the resin bed 12 and the portion of the artificial tooth 13 can be performed in parallel with each other by another flow. That is, since the resin bed and the artificial tooth portion can be produced without necessarily completing the production of the metal bed, the production time of the partial denture can be reduced.
Hereinafter, each step will be described.

In step S11, an impression is obtained, and an oral model is produced based on the impression. In this embodiment, a plaster model is produced as is well known. Impression acquisition and production of a gypsum model can be performed by a known method. By this step S11, for example, a plaster model 15 as shown in FIG. 3 is produced. As can be seen from FIG. 3, in this example, a tooth defect portion 15a appears as a portion indicated by reference numeral 15a. In this example, a partial denture 10 applicable to the defective portion 15a is manufactured.

Step S12 is a step of obtaining three-dimensional intraoral shape data from the intraoral model obtained in step S11. The form of the shape data is not particularly limited as long as the design of the metal bed, the resin bed, and the artificial tooth can be performed later by using a computer or the like, and examples thereof include CAD data.
The method for obtaining the three-dimensional shape data can be performed using a known device, for example, a three-dimensional optical scanner.
According to the present embodiment, the three-dimensional shape data of the intraoral shape is created from the intraoral model. However, the present invention is not limited to this, and the three-dimensional shape data may be created by directly measuring the inside of the oral cavity.

In step S13, a metal floor is designed with respect to the three-dimensional shape data in the oral cavity obtained in step S12. In this design, an appropriate metal floor shape may be appropriately designed for the three-dimensional shape data in the oral cavity using the CAD function. The basic design of the metal floor can proceed as is known.

As described above, after obtaining the intraoral shape data and the metal floor design data in step S13, the steps of preparing the metal floor 11 in steps S14 and S15, and the steps of forming the resin floor 12 and the artificial floor in steps S16 to S20. The step of manufacturing the portion of the teeth 13 can be performed in parallel with another flow. First, the production of the metal floor 11 in steps S14 and S15 will be described.

In step S14, a wax model having a metal floor shape as shown in FIG. 4 is placed on the intraoral model (gypsum model 15) obtained in step S11 based on the metal floor shape data obtained in step S13. 16 is manufactured.
The method for forming the wax model 16 having the shape of a metal floor is not particularly limited, but the wax model 16 can be manufactured by an NC machine tool or a 3D printer from the shape data of the metal floor obtained in the step S13. Then, the formed wax model 16 is applied to the oral cavity model 15 as shown in FIG.

In step S15, the metal floor 11 is obtained by using the intraoral model 15 and the wax model 16 in the shape of a metal floor obtained in step S14. Although the specific method is not particularly limited, the metal floor 11 can be obtained by, for example, replacing the wax of the wax model 16 with the metal constituting the metal floor 11 by casting using a flowing wax casting method.

金属 Thus, the metal floor 11 is obtained in the step including the step S14 and the step S15. In the present embodiment, the wax model 16 having the shape of the metal floor is manufactured as in the steps S14 and S15, and the metal floor 11 is manufactured based on the wax model 16. However, the present invention is not limited thereto, and the metal floor 11 is obtained in the step S13. The metal floor may be obtained by directly processing the shape data of the metal floor using an NC machine tool or a 3D printer. For this purpose, for example, the processing from the shape data of the metal floor to the processing of the metal floor may be performed using CAD / CAM (computer-aided design / computer-aided manufacturing) to produce the metal floor.

In addition, the wax model of the metal floor in the step S14, and the metal floor in the step S15 may be manufactured not once but in plural times. For example, first, a wax model or a metal floor without the clasp is prepared, and this is tried and adjusted in the oral cavity, and then the result is reflected to finally produce a metal floor including the clasp. it can.

On the other hand, after the data of the design of the intraoral model and the metal floor are obtained in step S13, apart from the above steps S14 and S15, the resin floor 12 and the artificial teeth 13 are manufactured in steps S16 to S20. Steps can be performed. Next, the production of the resin bed 12 in which the artificial teeth 13 are arranged in steps S16 to S20 will be described.

In step S16, based on the shape of the metal floor 11 obtained in step S13, a resin model 21 (see FIGS. 5 to 8) having a metal floor shape is manufactured.
The method of forming the resin model 21 having the shape of a metal floor is not particularly limited, but the resin model 21 can be manufactured by an NC machine tool or a 3D printer from the shape data of the metal floor 11 obtained in step S13. The resin used is not particularly limited, but examples thereof include hard resins and silicones.
Here, the resin model 21 can be subjected to a separation process on its surface. Thereby, when separating the resin bed 12 and the resin model 21 in the step S20 described later, the work can be performed smoothly.
Further, the resin model 21 of the metal floor is formed so that a clearance is formed in a range of 0.1 mm or more and 0.5 mm or less between the resin floor 12 to be finally manufactured and the metal floor 11 to be manufactured in step S15. Can be produced.

In step S17, a wax model 22 having a resin floor shape is prepared for the resin model 21 having a metal floor shape prepared in step S16. That is, wax is laminated on the floor 21b of the resin model 21 having the shape of a metal floor to form a resin floor. Thereby, as shown in FIG. 5, it is possible to obtain the intermediate member 20 in which the wax model 22 having the shape of the resin floor is disposed on the floor portion 21b of the resin model 21 having the shape of the metal floor.

In step S18, the artificial teeth 13 are arranged on the wax model 22 having the shape of the resin bed among the intermediate members 20 obtained in step S17. Thereby, as shown in FIG. 6, the wax model 22 having the shape of the resin floor was arranged on the floor 21 b of the resin model 21 having the shape of the metal floor, and the artificial teeth 13 were arranged on the wax model 22. The intermediate member 25 can be obtained. FIG. 7 is a conceptual cross-sectional view of a portion of the intermediate member 25 that includes the floor 21b, the wax model 22, and the artificial tooth 13. As described above, the intermediate member 25 has a shape in which the wax model 22 is stacked on the floor 21b and the artificial teeth 13 are further arranged.
In this embodiment, the artificial tooth 13 used in the partial denture 10 is used as it is as the artificial tooth 13 used in this step.

In step S19, the resin bed 12 is obtained using the intermediate member 25 obtained in step S18. Although a specific method is not particularly limited, for example, the wax of the wax model 22 having the shape of the resin bed is made to flow out by the lost wax method, and the obtained cavity is filled with the resin constituting the resin bed 12. Curing method.
As a result, as shown in FIGS. 8 and 9, the resin model 21 having the shape of the metal floor, the resin floor 12 laminated on the floor 21 b of the resin model 21, and the artificial teeth arranged on the resin floor 12 13 can be obtained. 8 is a view from the same viewpoint as FIG. 6, and FIG. 9 is a view from the same viewpoint as FIG.

In step S20, the resin model 21 having the shape of the metal floor is removed from the intermediate member 30 obtained in step S19. As a result, as shown in FIGS. 10 and 11, an intermediate member 35 including the resin bed 12 and the artificial teeth 13 arranged on the resin bed 12 is obtained. 10 is a diagram from the same viewpoint as FIG. 6, and FIG. 11 is a diagram from the same viewpoint as FIG. In particular, as can be seen from FIG. 11, by removing the resin model 21 having the shape of a metal floor, a concave portion 12 a is formed in the portion of the resin floor 12 where the resin model 21 was located. The concave portion 12a has a shape corresponding to the floor portion 11b of the metal floor 11.
If the separation process is performed on the resin model 21 having the shape of the metal floor as described above, the removal of the resin model 21 in this step is performed more smoothly.

部材 A member (intermediate member 35) including the resin bed 12 and the artificial teeth 13 arranged on the resin bed 12 can be obtained by the above steps S16 to S20. Up to this point, the metal floor 11 can be obtained in step S15 and the intermediate member 35 can be obtained in step S20, and these are in a separated state.

In the present embodiment, as in steps S16 to S19, the resin bed 12 was manufactured from a wax model. In addition, from the shape data of the metal floor obtained in the step S13, CAD / CAM is used to perform the process from designing to manufacturing of the resin floor by using data, and the artificial teeth are arranged here to obtain the intermediate member 35.

Step S21 is a step of bonding the metal floor 11 and the intermediate member 35 in a separated state. Specifically, as shown in FIG. 12, the floor portion 11b of the metal floor 11 is fitted into the concave portion 12a of the intermediate member 35, and both are adhered with an adhesive. Thereby, the partial denture 10 shown in FIG. 1 can be obtained. This step may be performed directly in the oral cavity using a dental acrylic resin (room temperature polymerization resin or photopolymerization resin).

As described above, as in the manufacturing method S1, from the shape of the metal floor 11 designed in step S13, at least two members (in this embodiment, the wax model 16 and the resin model 21) having the shape of the metal floor 11 are used. By manufacturing, the metal floor 11 and the other part (the part where the artificial teeth 13 are arranged on the resin floor 12) can be separately manufactured in parallel. Therefore, for example, both can proceed at the same time by sharing production, or the other can be advanced using the waiting time of one operation. This makes it possible to reduce the time required to produce the partial denture.

10 Dental prostheses (partial dentures)
DESCRIPTION OF SYMBOLS 11 Metal floor 11a Clasp 11b Floor 11c Connecting part 12 Resin floor 13 Artificial tooth 16 Wax model shaped metal floor 21 Resin model shaped metal floor

Claims

A method of manufacturing a dental prosthesis comprising a metal floor and a resin floor,
A step of acquiring three-dimensional shape data in the oral cavity;
Designing the shape of the metal floor based on the obtained three-dimensional shape data;
Producing at least two members having the shape of the metal floor from the designed shape of the metal floor.
Forming the resin bed for at least one of the produced members;
Removing the member from the formed resin bed;
Bonding the prepared metal floor to the resin floor from which the member has been removed,
A method for producing a dental prosthesis according to claim 1.