JPS5873736A - Dental alloy containing aluminum - Google Patents

Abstract

PURPOSE:To provide an Al-contg. dental alloy having much improved malleability and workability by contg. a small amt. of Al. CONSTITUTION:An Al-contg. dental alloy wherein Al is contained at 0.01-1% in dental alloys such as gold alloys, gold-siver-palladium alloys, silver-indium alloys, gold-contg. silver indium alloys or the like. Said Al-contg. alloy is produced by melting the prescribed amts. of Al together with the prescribed amts. of the respective component metals at high temp. In the case of the gold-contg. silver-indium alloy, the alloy is produced by the following method: Respectively specified amts. of gold, silver and Pd are put into a crucible where these are heated with an oxygen burner and are melted under stirring with a carbon bar. The melt is then charged into water and is solidified to granules. The resultant granular gold-silver-palladium alloy is put together with respectively prescribed amts. of In, Zn and Al into a crucible and while these are stirred by a carbon bar in an electric furnace heated to about 700 deg.C, the alloys are heted to melt. The thoroughly mixed soln. is charged into water and is solidified to granules, whereby the intended gold-contg. silver-indium alloy is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to dental alloys containing small amounts of aluminum.

Gold alloys, gold-silver-palladium alloys, silver-indium alloys, and the like have been conventionally used as dental materials, and gold-containing silver-indium alloys have been found to be preferable as dental alloys. Since these alloys are used for crown restoration, malleability is required for processing.

The object of the present invention is to provide the above-mentioned metal alloy which has further improved malleability as a dental material.

The alloy of the present invention is a dental mold containing 0.01 to 1 inch of aluminum.

Dental alloys included in the present invention include gold alloys, gold-silver-palladium alloys, silver-indium alloys, gold-containing silver-i/dium alloys, and the like. Dental alloys are alloys generally used for crown restorations, including crown prosthesis and filling, and include casting and non-casting applications. For example, a gold-silver-palladium alloy contains 12% or more of gold, 2596 or more palladium, and 40% or more of silver for non-casting use, and 12% or more of gold, 20% or more of palladium, and 40% or more of silver for casting use. Further, the gold-containing silver i/dium alloy contains 69% or more of silver, 22% or more of indium, and 0.01 to 3% of gold.

Although the above alloy is in practical use, it has been found that containing a small amount of aluminum in the above alloy further improves its malleability and improves the workability of the alloy.

The aluminum content is preferably 0.01-1%.

If the aluminum content is less than 0.01%, the improvement in malleability will be insufficient, and if the aluminum content exceeds 1%'(i-), it may deteriorate other properties of the dental alloy, so it is not preferred.

The aluminum-containing alloy of the present invention is produced by melting a predetermined amount of aluminum together with a predetermined amount of each component metal at high temperature. In the case of a gold-containing silver-indium alloy, it can also be produced as follows: "First, predetermined amounts of gold, silver, and palladium are placed in a crucible and heated with an oxygen burner.

Melting is carried out while stirring with a carbon rod. Gold and palladium, which have high melting points, are difficult to dissolve, so they can be easily dissolved by scooping up the undissolved solid phase to the surface with carbon and heating it directly with oxygen and a burner.

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 e't. At that time, it is preferable to stir using a carbon rod to mix the component metals well.

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

Produced by the above method 0.5% gold, 71.8% silver, 22.5% indium, 1.0% palladium, 3.8% zinc
A gold-containing silver-indium alloy containing 0.41e of aluminum and 0.41e of aluminum was melted in an electric furnace and poured into a casting mold preheated to about 70.0°C and left to cool.
The tensile strength was 33kf/ in the tensile test and hardness test conducted in accordance with JISZ2241 and JISZ2243 on a tensile test piece of 50 mm and a hardness test piece with a wall thickness of 5+m or more.
f/d, elongation of 9 inches, Purinel hardness of 94, cast,
Regarding the specimen of IIE with an effective flat area of approximately 20 mm x 15 mm polished with No. 400 abrasive paper according to JISR6253
There was no discoloration in the discoloration test conducted in accordance with T6105. The aluminum content gave it a color intermediate between gold and pink, and its malleability made it suitable for processing as a dental alloy, such as bridges, cast crowns, and continuous teeth.

Claims (1)

[Scope of Claims] 1) A dental alloy containing 0.01 to 1% aluminum. 2) The dental alloy according to claim 1, wherein the alloy is a gold-containing silver-indium alloy. □3) The dental alloy according to claim 1, wherein the alloy is a silver-indium alloy. 4) The dental alloy according to claim 1, wherein the alloy is a gold alloy. 5) The dental alloy according to claim 1, wherein the alloy is a gold-silver-palladium-1 alloy.