Patent ID: 8519019

Claim:
A dental composition comprising: (A) a concentrated silica solution comprising 15 to 80% of colloidal particles of amorphous silica in at least one continuous silicone phase, wherein the at least one continuous silicone phase comprises a crosslinkable and/or polymerizable silicone oligomer and/or polymer which is liquid at ambient temperature or heat-fusible at a temperature below 100° C., the silicone oligomer and/or polymer comprising: (i) at least one unit of formula (FS): Z—Si R 0 a O (3-a)/2 in which: a=0, 1 or 2, R 0 , which are identical or different, represent an alkyl, cycloalkyl, aryl, vinyl, hydrogen, hydroxyl or alkoxy radical, Z, which are identical or different, is an organic substituent comprising at least one epoxy and/or alkenyl ether and/or oxetane and/or dioxolane and/or carbonate reactive functional group, (ii) and at least two silicon atoms, (B) at least one aromatic hydrocarbonaceous photosensitizer comprising one or more substituted or unsubstituted aromatic rings having a residual absorption of the light between 200 and 500 nm, (C) at least one cationic initiator selected from those for which the cationic entity is selected from the onium salts of formula (I): [(R 1 ) n -A-(R 2 ) m ] + (I) in which formula: A represents an element from Groups 15 to 17, R 1 represents a C 6 -C 20 carbocyclic or heterocyclic aryl radical, where the heteroelements in said heterocyclic aryl radical are nitrogen or sulfur, R 2 represents R 1 or a linear or branched C 1 -C 30 alkyl or alkenyl radical; said R 1 and R 2 radicals optionally being substituted by a C 1 -C 25 alkoxy, C 1 -C 25 alkyl, nitro, chloro, bromo, cyano, carboxyl, ester or mercapto group, n is an integer ranging from 1 to v+1, v being the valency of the element A, m is an integer ranging from 0 to v−1 with n+m=v+1.