Silicone-based impression material

US6121362A · kind A · utility

Assignee

• ESPE Dental AG · DE

Inventors

• Erich Wanek · Kaufering, DE
• Joachim W. Zech · Kaufering, DE

Key dates

• Filing date: Jul 16, 1998
• Grant date: Sep 19, 2000
• Expiry date: Jul 16, 2018

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K6/90
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A monophase silicone impression composition which crosslinks by an addition reaction, includes the following components: PA1 (a) organopolysiloxanes with at least two unsaturated groups in the molecule, PA1 (b) organohydrogenpolysiloxanes with at least 2 SiH groups in the molecule, PA1 (c) optionally, organopolysiloxane without reactive groups, PA1 (d) a platinum catalyst, PA1 (e) a hydrophilizing agent, PA1 (f) diatomaceous earth, PA1 (g) a filler, and PA1 (h) optionally further customary additives, auxiliaries and dyestuffs, the amount of component (f) is 8 to 25 wt. %, based on the total weight of the cured composition, and the composition has a Shore hardness A to be determined in accordance with DIN 53505, of less than 45--measured after 30 minutes--, and a viscosity, determined in accordance with ISO 4823, of 31 to 39 mm. The impression composition is suitable for the production of provisional bridges and crowns. It replaces the alginate compositions used hitherto for this purpose and overcomes the disadvantages associated with these compositions.