Powdered dental material and process for the preparation thereof

US4527979A · kind A · utility

Assignee

• ESPE Fabrik Pharmazeutischer Praparate GmbH · DE

Inventors

• John W. McLean · London, GB
• Oswald Gasser · Hanerau-Hademarschen, DE

Key dates

• Filing date: Dec 21, 1983
• Grant date: Jul 9, 1985
• Expiry date: Dec 21, 2003

Classification

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

Abstract

Powdered dental material of a sintered mixture of calcium aluminum fluorosilicate glass and precious metals (or alloys thereof with each other or with up to 40% non-precious metals), which may optionally contain polycarboxylic acid and/or a chelating agent and/or further powdered precious metal. The dental material can be prepared by sintering a mixture of the glass and the precious metal at a temperature greater than 600.degree. C., grinding the sintered product to a powder and admixing the optional further components. Use of the self-hardening glass ionomer cements for dental filling purposes gives fillings having excellent resistance to wear, most notably at the edges and corners in the molar region.