Gold-palladium alloys for dental materials

US5695714A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Bernd Kempf · Alzenau, DE
• Doris Hathaway · Hanau, DE
• Gernot Schoeck · Bruchköbel, DE
• Hans-Martin Ringelstein · Frankfurt, DE
• Bernd Meier · Darmstadt, DE

Key dates

• Filing date: Jul 20, 1994
• Grant date: Dec 9, 1997
• Expiry date: Jul 20, 2014

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K6/844
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Gold-palladium alloys with a high gold content for dental applications should, for reasons of biocompatibility, not contain any toxically dubious components. For particularly corrosion-resistant and biocompatible Type 4 alloys, tin is needed as the only base-metal component in amounts between 0.7 and 5.8 wt % if one remains within defined limits in a palladium-tin diagram of FIG. 1, for Pt values less than 2%. Such alloys contain, in addition to gold and tin, 6 to 25 wt % palladium, 0 to 12 wt % platinum and 0 to 2 wt % of at least one of iridium, rhodium and/or ruthenium.