Yellow dental alloy with a high gold content

US5221207A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Gernot Schoeck · Bruchköbel, DE
• Bernd Kempf · Alzenau, DE
• Werner Groll · Alzenau, DE

Key dates

• Filing date: Oct 2, 1991
• Grant date: Jun 22, 1993
• Expiry date: Oct 2, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C5/02
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A yellow dental alloy is disclosed with high gold content for castings and ceramic veneers with an adjusted thermal expansion coefficient that does not produce any undesirable discoloration of the ceramic veneers and that is very hard. It contains 70 to 85% by weight gold, 5 to 13% by weight silver, 2 to 9% by weight platinum, 0 to 4.5% by weight palladium, 0.05 to 1% by weight iridium, rhenium, rhodium and/or ruthenium, 2 to 8% by weight copper, 0.1 to 6% by weight indium, zinc and/or germanium, and 0 to 4% by weight gallium, iron and/or tungsten.