JPH0392148A - Cementing of clasp on denture pressure-impression bed - Google Patents

Abstract

PURPOSE:To cement a clasp and an superplastic metal sheet at a cementing part at the same time when molding is performed by performing the molding under such a condition that the clasp with unevenness on a cementing part with the superplastic metal sheet and a wax extended on the unevenness is placed on a female mold. CONSTITUTION:In manufacturing a denture pressure-impression bed by applying heat and pressure on an superplastic metal sheet and molding it into a shape acclimated to a female mold, the molding is performed under such a condition that a clasp with unevenness on a cementing part with the above described metal sheet and with an insert metal on the unevenness is placed on the female mold. At the same time when the molding is performed, the cementing part of the clasp and the superplastic metal sheet are cemented. As the result, it is possible to perform cementing of the clasp with the pressure-impression bed at the same time when the pressure-impression bed is molded and it is possible thereby that labor and expenditure is reduced and deformation of the pressure- impression bed which easily occurs when bonding with wax is performed is prevented.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for efficiently joining a clasp to a coining base for a denture at the same time as forming it. [Prior Art] A method for producing a coining bed for dentures (Japanese Patent Application Laid-Open No. 63-95048) which does not require a positive mold by using a superplastic metal plate has recently been developed; It is necessary to bond the clasp to the floor, and in this case, conventional methods have been employed in which the clasp is soldered or embedded in a resin for the floor after manufacturing the denture coining base.

By the way, in order to perform soldering, it is necessary to locally heat the denture coining base to at least the temperature at which the brazing material melts.
On the other hand, the superplastic alloy has the disadvantage that it deforms when exposed to high temperatures for a long time. Particularly when Ti-based materials are used, they tend to react with oxygen, nitrogen, hydrogen, etc. at high temperatures, causing embrittlement. Therefore, it is necessary to perform soldering under a vacuum or inert gas atmosphere.The brazing process is not only labor-intensive and costly, but also carries the risk of deteriorating the properties of the coined flooring material.

[Problems to be Solved by the Invention] Therefore, we considered whether it would be possible to solder the coining base and clasp together at the same time as manufacturing the coining base for dentures, and conducted various studies. However, when a clasp filled with brazing filler metal was placed on a negative mold, and a superplastic alloy plate was placed above it, and heat and pressure were applied to form the clasp, the brazing filler metal flowed out, making it impossible to join the clasp. I found out. [Means for Solving the Problems] The present inventors conducted research for the purpose of establishing a new method free from the above-mentioned drawbacks, and completed the present invention having the following structure. That is, when manufacturing a denture coining base by applying heat and pressure to a superplastic metal plate and molding the metal plate into a shape that fits the negative mold, the joint part with the metal plate has irregularities and the irregularities are formed. If the above-mentioned forming is carried out with the clasp on which the brazing filler metal is poured being placed on the negative mold, the above-mentioned clasp and the superplastic metal plate can be joined at the above-mentioned joint portion at the same time as the above-mentioned forming. [Function] The clasp is fixed to the coining bed using the fishing leg as the joint part, and the material of the clasp used to provide unevenness at the joint part is Co-Cr alloy. Various dental metals such as Ni-Cr alloy and Ti can be used. However, the metal must have a melting point higher than the superplastic temperature of the superplastic metal used as the coining bed material. The shape of the unevenness may be any shape as long as it does not flow out much when the filler metal melts. The method of forming the unevenness is not particularly limited, but for example, when making a mold for manufacturing a clasp, you can create a clasp by gluing acrylic beads onto the area where you want the unevenness of the wax pattern to be made. Because the C acrylic beads are burned away together with the wax during the heating process, a clasp with irregularities is formed at the joining area. The brazing material used is not particularly limited as long as it is a dental metal wax that is compatible with the material of the coining bed and clasp and has a melting point lower than the temperature at which it exhibits ultra-degradable properties, but for example, it may be an Au-based wax. Ag
Base solder, Ti-based solder (including solder for diffusion bonding), etc. can be used. Next, we will explain the joining method. First, a negative impression is prepared using an impression of the clasp, which has irregularities at the joint site, and the human oral cavity. Next, wax is poured onto the irregularities of the clasp, and the clasp is placed on a negative mold to produce a negative mold on which the waxed clasp is placed. In addition, apply anti-flux agent to areas on the clasp where it would be a problem if molten brazing filler metal adhered. From then on, as usual, heat and pressure are applied to the superplastic metal to form it into a shape that fits the negative mold, and the joining of the clasp and coining bed is completed at the same time as the forming is completed. The present invention will be explained in more detail with reference to examples below, but the following examples do not limit the present invention, and all modifications and implementations within the scope of the above and later descriptions are within the technical scope of the present invention. It will be done. [Example] A wax pattern for a clasp is made, and one acrylic bead (diameter 0.2 to 0.8+em) is placed in the area of the wax pattern where the clasp and the coining bed are joined.
After several pieces were glued together, they were buried in a phosphate-based investment material for dental casting to create a mold. The mold and Co-Cr alloy for dental casting (Co65wt%, Cr25wt%
%, and 10 wt%) by a conventional method. Separately, we prepared a negative mold made of superplastic molding material and whose shape was copied from the human oral cavity. Dental 1
A clasp filled with 4K wax was placed on the negative mold, and a Ti-6AI-4V alloy plate was placed above it, and heated and pressurized. As a result, the clasp and coining bed were formed into a coining bed for aS, and the wax was applied to the clasp and coining bed at the same time. The contact has ended. [Effects of the Invention] The present invention is configured as described above, and it is possible to join the clasp and the coining bed at the same time as forming the coining bed, thereby reducing labor and costs and eliminating coining that is likely to occur during soldering. Deformation of the floor is prevented.

Claims (1)

[Claims] When producing a coining base for dentures by applying heat and pressure to a superplastic metal plate and forming it into a shape that fits the negative mold, the joining part with the metal plate has irregularities and the insert metal is flowed over the irregularities. The clasp is applied to a denture coining base, wherein the molding is performed with the waxed clasp placed on a negative mold, and at the same time as the molding, the joint portion of the clasp and the superplastic metal plate are joined. How to join.