Patent ID: 7247660
Filing Date: 2007-07-24
Classification: A61K,Y10S

Abstract:
1. A process for the preparation of a dental prosthesis or dental restoration, comprising the step of shaping and curing a low shrinking polymerizable or crosslinkable dental composition comprising a mixture of: (1) at least one crosslinkable and/or polymerizable silicone oligomer or polymer which is liquid at room temperature or which is heat-meltable at a temperature of less than 100° C., and which comprises: wherein: (2) at least one aromatic hydrocarbon photosensitizer, having a residual light absorption of between 200 and 500 nm, and selected from the group consisting of the following formulae (VIII), (X). (XII) and (XXII): thioxanthones of formula (VIII): wherein: xanthones of formula (X): anthracene of formula (XII): biscoumarins of formula (XXII): R —NR (3) at least one dental filler present in a proportion of at least 10% by weight relative to the total weight of the composition, and (4) an effective quantity of at least one borate-type photoinitiator, whose borate residue is: wherein the cationic entity of the borate is: and wherein the composition has a volumetric polymerization and/or crosslinking shrinkage of less than 1.5% v/v.