JPS633015B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a dental metal material that is used by mixing a metal powder for solidification into an alloy that is liquid at room temperature. [Prior Art] Amalgam has conventionally been used as a dental metal material to be filled for tooth cavity restoration. This involves mixing and kneading metal powder for solidification into Hg, which is liquid at room temperature.The metal powder is usually Ag-
Sn, Ag-Zn, Ag-Sn-Zn, etc. are used. [Problems to be solved by the invention] As mentioned above, this amalgam uses Hg as a metal that is liquid at room temperature, so its toxicity becomes a problem, and dentists etc. It is believed that it has a negative effect on patients whose teeth are constantly filled with fillings. However, because this amalgam is easy to use, it continues to be used despite concerns about toxicity. However, research into metals that can replace Hg is progressing, and research into pure Ga and binary alloys of Ga is already underway. Ga is non-toxic and has a melting point of about 30°C, so in order to lower its melting point,
By adding In, the temperature can be lowered to 17°C, but the melting point is still too high for use and the workability is poor, so it has not been widely used. [Means for Solving the Problems] The present invention provides a dental metal material that is used by mixing and kneading metal powder for solidification into an alloy that is liquid at room temperature. Sn11~
By adding 30 wt% and 0.05 to 2.5 wt% of one or two elements of Ag, Al, Zn, Au, and Cu, and the remainder being Ga, a quaternary or higher multi-component alloy with a melting point of 15°C or less was created. Features. [Example] Examples of the present invention will be described below. By creating a multi-element alloy in which 0.05 to 2.5 wt% of one or two elements of Ag, Al, Zn, Au, and Cu are added to the three elements Ga-In-Sn, which are liquid at room temperature, the melting point is lower than 15℃. It is a metal that has Examples are shown in Table 1 below.

[Table] In addition, in the above-mentioned Ga-Sn-In ternary and additive element coexistence state, if Sn exceeds 30wt% and In is less than 1wt% or exceeds 45wt%, the melting point of the liquid metal becomes too high to be used for practical use. do not have. Also, Sn is 11wt%
It has been found that when the content is less than 1, the compressive strength becomes insufficient in the coexistence state with the above elements. Furthermore, with regard to additive elements, if the amount is less than 0.05 wt%, there is no effect of improving mechanical properties, and if it is added in excess of 2.5 wt%, the melting point will increase. The alloy shown above can be obtained by placing a predetermined amount of the component metals in a quartz crucible and performing high frequency melting in an N ₂ atmosphere. Next, the compressive fracture strength of a dental metal material prepared by mixing the above alloy with metal powder for solidification is shown. An alloy having the composition shown in No. 1 in Table 1 above,
Ga65wt%, Sn23wt%, In10wt%, Ag1wt%,
A metal powder for solidification of 250 mesh or less of 66Ag-25Sn-9Zn alloy, similar to the conventional one obtained by atomization method, was mixed into a liquid alloy containing 1wt% Zn at a weight ratio of 1:1.5 and kneaded well. I put it in a constant temperature bath at 40℃ and took it out after 1 hour and did a compression test, and it weighed about 13Kg.
A compressive fracture strength of f/mm ² was obtained. Similarly, samples No. 2 to No. 8 were also subjected to compression tests. The results are shown in Table 2 below.

〔Effect of the invention〕

The metals made from the above quaternary or higher multi-element alloys are conventional
Like Hg, it is used as a dental material by mixing it with metal powder for solidification, but since this metal is an alloy, conventional Hg
was mixed with two or more metal powders such as Ag-Sn, Ag-Zn or Ag-Sn-Zn, but these metal powders are of course mixed with single powders of Ag, Sn or Zn. It can also be used satisfactorily as a dental material. Generally, the lower the melting point of a liquid at a certain temperature, the greater its free energy. Therefore, the present invention
The diffusion rate for certain metals and alloys increases compared to Ga alone or the Ga-In binary system. In addition, by using a multi-component alloy of quaternary or higher elements, the present invention can lower surface tension, improve wettability to other metals, etc., and furthermore, because it is a multi-component alloy, diffusion to other metals or alloys is increased. can be done. Therefore, when mixed with metal powder for solidification and filled and solidified, it can be used as a dental metal that is much better than Ga alone or a binary system of Ga-In for the above reasons. According to the present invention, the multi-component alloy is made by adding one or two elements of Ag, Al, Zn, Au, and Cu to the ternary alloy of Ga-In-Sn, which has excellent properties against tooth structure and other metals. It has wettability, so when used to fill tooth cavities, no gaps are created between the material and the tooth structure, and its melting point is low, so it has extremely good workability when used. In addition, it has no toxicity in biological reactions and is suitable as a dental metal, and is useful not only for cavity repair but also for denture repair and dental cast metal floor repair.

Claims (1)

[Claims] 1. In dental metal materials used by mixing and kneading metal powder for solidification into an alloy that is liquid at room temperature, the liquid alloy is mixed with In1-45wt%, Sn11-30wt%, and Ag, Al, Zn, Au, Cu. A dental metal characterized in that it contains 0.05 to 2.5 wt% of one or two of the five elements, and the balance is Ga, resulting in a quaternary or higher multi-component alloy having a melting point of 15°C or less. material.