JPS58177428A - Dental silver-indium alloy containing platinum and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a dental Ag-In alloy contg. Pt, having fine luster, and causing no discoloration after application by melting Pt, Ag and Pd, granulating the melt in water, melting the resulting granular alloy together with In, Zn and Al, and granulating the melt in water. CONSTITUTION:Necessary amounts of Pt, Ag and Pb are put in a crucible so as to make the Pt content 0.01-3%, and they are melted by heating with an oxygen burner. The melt is charged into water and solidified in the form of granules. The resulting granular Pt-Ag-Pd alloy is dried, put in a crucible together with necessary amounts of In, Zn and Al, and melted in an electric furnace heated to about 700 deg.C. The melt is agitated to well mix the constituent metals, and the melt is charged into water and solidified in the form of granules. The granules are taken out of the water and dried. By this method an Ag-In alloy contg. Pt and suitable for a crown, an inlay, etc. is obtd. The alloy has high toughness, satisfactory workability and metallic luster tinged with the color of platinum, and it causes no discoloration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a platinum-containing silver-indium alloy for dental use and a method for producing the same.

An alloy containing silver indium as a main component is used as a dental material for crown restoration, but this alloy loses its luster and darkens over time after application, so it 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 become discolored after application.

The silver-indium alloy of the present invention is a platinum-containing silver-indium alloy for dental use, which contains silver and indium as the main components, and contains 0.01 to 3 platinum i.

The method for producing a platinum-containing indium alloy of the present invention includes platinum 1. Predetermined amounts of each of silver and palladium were placed in a crucible and heated and melted with an oxygen burner, and then the solution was poured into water to obtain a granular platinum-silver-palladium alloy. This method is characterized by placing a predetermined amount of each in a rutsuho and melting it in an electric furnace at about 700° C., and then pouring the resulting solution into water and granulating it.

The platinum-containing silver-indium alloy of the present invention is a dental alloy mainly composed of known silver and indium and containing palladium, zinc, and aluminum, and has a compositional change in that a part of the silver is replaced with platinum. different, silver 69% or more, indiram 22% or more, palladium 2.0% or less, zinc 6
% or less, aluminum content is less than 1.0%, and further contains platinum in an amount of 0.01 to 3%.

If the platinum content is less than 0.01%, the discoloration resistance of the alloy will not be sufficient, and even if the platinum content exceeds 3%, the effect of improving properties by increasing the platinum content will be small.

The platinum-containing silver-indium alloy of the present invention has a platinum-colored metallic luster, has excellent discoloration resistance, abrasion resistance, and corrosion resistance as a dental material, has good malleability, and has good castability. In good condition.

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

First, predetermined amounts of platinum, silver, and palladium are placed in a crucible and heated with an oxygen burner. Dissolution is carried out while stirring with a carbon rod.Although platinum and palladium, which have high melting points, are difficult to dissolve, they can be easily dissolved by scooping up the undissolved solid phase to the surface with the carbon rod and heating it directly with an oxygen burner. Stir well to mix the ingredients, then pour the solution into water and solidify into granules.

The resulting granular platinum-silver-palladium alloy is dried, placed in a melting pot 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 stir using a carbon rod to mix the component metals well. 'Pour the well-mixed solution into water to solidify it into granules, then take it out of the water and dry it in a dryer.

0.5% platinum and 71.8% silver produced by the above method,
Indium 22.5%, Palladium 1. (1. Zinc 3.
A platinum-containing silver-indium alloy containing 8% aluminum and 0.41% aluminum was made by melting it in an electric furnace and pouring it into a casting mold preheated to about 700°C and allowing it to cool. ,φx5
JIS Z2241 and 0 mm tensile test pieces and hardness test pieces with a wall thickness of 5 or more. , 1 in accordance with 18□2243
Tensile strength approximately 33kgf in line-gathered tensile test and hardness test
JIS for a test piece with an effective flat area of about 20 mm x 15 mm that was discarded and polished with No. 400 abrasive paper according to JISR 6253, exhibiting a /-1 elongation of about 9 modulus and Purinel hardness of about 94.
There was no discoloration in the discoloration test conducted in accordance with T6105.

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 repair, has a platinum-colored metallic luster and does not discolor, and is much more in line with the desires of the therapist than conventional silver-indium alloys.

Claims (2)

[Claims] (1) The main components are silver and indium, and platinum is 0.01%.
Dental platinum-containing silver-indium alloy containing ~3%. (2) Predetermined amounts of each of platinum, silver, and palladium are placed in a crucible, heated and melted with an oxygen burner, and then the solution is poured into water to obtain a granular platinum-silver-palladium alloy. Approximately 700
1. A method for producing a platinum-containing silver-indium alloy, which comprises melting the alloy in an electric furnace at ℃, and pouring the resulting solution into water to granulate it.