Process for preparing a pasty dental material which is an organopolysiloxane filler combined with a polymerizable bonding agent

US5248706A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Peter Panster · Rodenbach, DE
• Ralf Janda · Bad Homburg vor der Höhe, DE
• Peter Kleinschmit · Hanau, DE

Key dates

• Filing date: May 19, 1992
• Grant date: Sep 28, 1993
• Expiry date: May 19, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/58
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing a dental material filler in the form of a copolycondensate. An alkoxy silane having a formula of Si(OR.sup.3).sub.4 and a titanium compound are dissolved in a water-miscible solvent. Optionally, additional alkoxysilanes having the formulas R.sup.1 --Si(OR.sup.3).sub.3 and R.sup.2.sub.2 Si(OR.sup.3).sub.2 are also dissolved in the solvent. The reactants are hydrolyzed and condensed to form a reaction mixture from which a heterosiloxane is formed. The heterosiloxane is separated, optionally washed, dried and tempered. The heterosiloxane may then be ground to a desired size and/or formed into various dental materials, such as fillings, inlays, veneers, seals, crowns, bridges, dentures, artificial teeth and adhesives for dental materials. Alternatively, the reaction may take place without the use of a water miscible solvent, such that the precondensing takes place in water.