JPS5825446A - Gold-containing silver indium alloy for dental purpose and production thereof - Google Patents

Abstract

PURPOSE:To provide a gold-contg. silver indium alloy for dental purpose which has good gloss and does not discolor after application by consisting said alloy essentially of Ag and In and contg. Au at a prescribed ratio therein. CONSTITUTION:Respectively specified contents of Au, Ag and Pd are put in a crucible, and are heated with an oxygen burner under stirring with a stirring bar. Here, the unmolten solid phase of Au and Pd of high m. p. which are difficult to melt is scooped up on the surface and is heated directly with the oxygen burner to melt them easily. The melt is thoroughly stirred and the resultant soln. mixed with the components is charged into water to solidify the soln. into the granular form. The resultant granular gold silver palladium alloy is dried and is put together with respectively specified contents of In, Zn and Al in a crucible and these are melted in an electric furnace which is beforehand heated to about 700 deg.C. The soln. prepd. in such a way is charged into water to solidify the same into the granular form. The resultant gold-contg. silver indium alloy for dental purpose contg. 0.01-3% Au has metallic gloss of a golden color, is highly resistant to discoloration, abrasion and corrosion as a dental material, and has good ductility and castability.

Description

[Detailed description of the invention] Relating to a manufacturing method.

An alloy containing silver indium as a main component is used as a dental material for dental crown restoration, but this alloy loses its luster and darkens over time after application, and has not been able to fully meet the wishes of practitioners.

An object of the present invention is to provide a silver-indium alloy that can be used as a dental material for crown restoration, has good gloss, and does not discolor after application.

The indium alloy of the present invention is a dental gold-containing silver-indium alloy that contains silver and indium as main components and contains 0.01 to 3 tres of gold.

The method for producing a gold-containing silver-indium alloy of the present invention includes gold-containing silver-indium alloys. Predetermined amounts of silver and palladium were placed in a crucible and heated and melted with an oxygen burner, and the solution was poured into water to obtain a granular gold-silver-palladium alloy. This method is characterized by placing a quantitative amount in a crucible, melting it in an electric furnace at about 700°C, and pouring the resulting solution into water to granulate it.

The gold-containing silver-indium alloy of the present invention differs in composition from the known silver alloy, and contains 69% or more of silver and indium
Contains 2% or more, palladium 2.0 or less, zinc 6 or less, aluminum 1.0% or less, and gold content is 0.01
~3%.

When the gold content is less than 0.01%, the discoloration resistance of the alloy is insufficient, and even when the gold content exceeds 6%, the effect of improving properties due to the increase in the gold content is small.

The gold-containing silver-indium alloy of the present invention has a golden-colored metallic luster, and has good discoloration resistance, abrasion resistance, and
It has excellent corrosion resistance, good malleability, and good castability.

The gold-containing silver-indium alloy of the present invention is manufactured as follows.

First, predetermined amounts of gold, silver, and palladium are placed in a crucible and electrified using an oxygen burner. Carbon can be easily dissolved. Stir well to mix the ingredients, then pour the solution into water and solidify into granules.

The obtained granular gold-silver-palladium alloy is dried, placed in a crucible together with predetermined amounts of indium, zinc, and aluminum, and melted in an electric furnace preheated to about 700°C. At that time, it is preferable to mix the component metals well by stirring with a carbon rod.

The well-mixed solution is poured into water to solidify into particles, taken out of the water and dried in a drying oven.

Gold 0.5%, silver 718%, indium 225%, palladium 1.0%, zinc 6.8%, manufactured by the above method,
A gold-containing silver-indium alloy containing 0.4% aluminum was made by melting it in an electric furnace and pouring it into a casting mold preheated to about 700°C and leaving it to cool.2±0.5■φX50+a+
J for tensile test pieces and hardness test pieces with a wall thickness of 5 haze or more.
In the tensile test and hardness test conducted in accordance with ISZ2241 and JISZ2245, it showed a tensile strength of 33 hf/', an elongation of 9 inches, and a Prinell hardness of 94.
Approximately 20 effective flat areas polished with No. 400 abrasive paper by No. 55
,, JIST 6 for lX 15'101 test piece
There was no discoloration in the discoloration test conducted in accordance with 105.

The alloy of the present invention has higher viscosity than conventional silver-indium alloys, has appropriate hardness, is not brittle, has good malleability, and has good workability as a dental alloy. It is suitable for restorations, has a golden-brown metallic luster, does not discolor, and is much more accommodating to the wishes of the therapist than conventional silver-in-external alloys.

Claims (2)

[Claims] (1) A dental gold-containing silver-indium alloy containing silver and indium as main components and 0.01 to 3% gold. (2) Predetermined amounts of each of gold, silver, and palladium are placed in a crucible, heated and melted with an oxygen burner, and the solution is poured into water to obtain a granular gold-silver-palladium alloy. A method for producing a gold-containing silver-indium alloy, which comprises placing predetermined amounts of gold and aluminum in a crucible, melting the resulting solution in an electric furnace at about 700°C, and pouring the resulting solution into water to granulate it.