Low gold dental alloys

US4576790A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Josef Rothaut · Fort Lee, US
• Jurgen Hausselt · Langenselbold, DE
• Rudi Steinke · Hanau, DE
• Angela Klaus · Highland Park, US

Key dates

• Filing date: Jan 28, 1985
• Grant date: Mar 18, 1986
• Expiry date: Jan 28, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C5/04
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Low gold dental alloys, especially for firing on dental porcelains, should be easily worked, result in no discolorations and bubble formation in the firing, and have a physiologically replaceable hardness and a low melting interval. These properties are shown by alloys having 20 to 35 wt. % gold and 45 to 65 wt. % palladium if they also contain PA0 (a) 6 to 15 wt. % copper and 0 to 10 wt. % nickel, PA0 (b) 0 to 12 wt. % indium, 0 to 12 wt. % tin, and 0 to 4 wt. % gallium, with the proviso that the sum of the content of indium and tin added to two and one-half times the gallium content must give a value between 5 and 15 wt. %, PA0 (c) 0.1 to 1 wt. % iridium and/or rhenium and/or ruthenium, and PA0 (d) optionally 0 to 1 wt. % aluminum, 0 to 1 wt. % tantalum, 0 to 1 wt. % titanium and/or 0 to 5 wt. % silver.