Patent ID: 8262391

Claim:
A dental composition comprising: (1) crosslinkable or polymerizable silicone monomers which are a mixture of compounds of the formula: (i) wherein a=0, 1 or 2; (ii) wherein a=0; and (iii) wherein a=0 and b=1; said crosslinkable or polymerizable monomers being the only crosslinkable or polymerizable monomers in the composition, (2) at least one dental filler present in a proportion of at least 10% by weight relative to the total weight of the composition, and (3) an effective quantity of at least one organometallic complex borate photoinitiator having a residual light absorption of between 200 and 500 nm, the photoinitiator having a cationic and a borate anionic entity, said cationic entity being of formula (II): (L 1 L 2 L 3 M) +q , wherein: M represents a group 4 to 10 metal, L 1 represents 1 ligand bound to the metal M by π by electrons, said ligand being η 3 -alkyl, η 5 -cyclopendadienyl, η 7 -cycloheptratrienyl and optionally substituted η 6 -benzene having from 2 to 4 condensed rings, each ring being capable of contributing to the valency layer of the metal M by 3 to 8 π electrons; L 2 represents a ligand bound to the metal M by π electrons, said ligand being n 7 -cycloheptratrienyl or n 6 -benzene and the compounds having from 2 to 4 condensed rings, each ring being capable of contributing to the valency layer of the metal M by 6 or 7 π electrons; L 3 represents from 0 to 3 ligands, which are identical or different, linked to the metal M by σ electrons, said ligand(s) being CO or NO 2 + ; the total electron charge q of the complex to which L 1 , L 2 and L 3 contribute and the ionic charge of the metal M being positive and equal to 1 or 2; and said anionic borate being of formula (Ill): [BX a R b ] − wherein: a and b are integers ranging, for a, from 0 to 3 and, for b, from 1 to 4 with a+b=4, the symbols X represent: a halogen atom with a=0 to 3, or an OH functional group with a=0 to 2, the symbols R are identical or different and represent: a phenyl radical substituted with at least one electron-attracting group or with at least 2 halogen atoms, this being when the cationic entity is an onium of an element of groups 15 to 17, a phenyl radical substituted with at least one element or one electron-attracting group, this being when the cationic entity is an organometallic complex of an element of groups 4 to 10, or an aryl radical containing at least two aromatic nuclei, optionally substituted with at least one electron-attracting group or element, regardless of the cationic entity.