Preformed dental composite crown, process of production and use thereof

US11534264B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Andreas Herrmann · Steinebach, DE
• Gallus Schechner · Herrsching am Ammersee, DE
• Reinhold Hecht · Kaufering, DE
• Helmar B. Mayr · Kaufering, DE
• Malte Korten · Moorenweis, DE
• Bernhard Hofmann · Peißenberg, DE
• Gioacchino Raia · Türkenfeld, DE
• Till Meurer · Bonn, DE

Key dates

• Filing date: Mar 9, 2020
• Grant date: Dec 27, 2022
• Expiry date: Jan 29, 2041

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K6/893
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The invention relates to a preformed dental composite crown being characterized by its shape and chemical composition, the shape being characterized as follows: having an occlusal top surface and depending buccal, mesial, distal and lingual side surfaces, the side surfaces being connected to each other and forming a crown cervix, the wall thickness of the crown at the crown cervix being lower than 0.6 mm; at least two of opposing depending side surfaces having a concave shape; the chemical composition of the material the preformed dental composite crown is made of being a hardened composition comprising the following components: nano-filler(s) in an amount from 20 to 70 wt. %, resin matrix in an amount from 20 to 75 wt. %, wt. % with respect to the weight of the chemical composition, the resin matrix comprising urethane(meth)acrylate(s) and (meth)acrylate(s) not comprising a urethane moiety.The invention also relates to a kit of parts comprising such a preformed dental composite crown, processes for producing such crowns and the use of such a crown for treating a dental tooth.