Method of producing a sintered dental prosthesis

US4970050A · kind A · utility

Inventors

• Werner Groll · Alzenau, DE
• Angela Klaus · Highland Park, US
• Thomas Lange · Unterhaching, DE

Key dates

• Filing date: Dec 13, 1989
• Grant date: Nov 13, 1990
• Expiry date: Dec 13, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C1/0466
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A method of producing a sintered, very high density dental prosthesis from a suspension containing noble-metal powder mixtures with bi or multimodal particle-size distribution and a mixing liquid. The suspension is molded to the desired shape and then the dental prosthesis is dried. The molded dental prosthesis is then heat-treated 5 to 45 minutes between 100.degree. and 400.degree. C., then heated with an average temperature elevation of 50 to 300 K/min. to 800.degree. C. and then brought to the sintering temperature T at 20 to 200 K/min. The sintering temperature T is between T.sub.solidus - 200) and T.sub.solidus - 70), whereby T.sub.solidus is the solidus temperature of the sintered alloy. The cooling-down of the dental prosthesis takes place under a vacuum or a protective gas.