Patent ID: 7129282

Claim:
A dental composition comprising: (1) 1 to 99% by weight, of at least one crosslinkable 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., comprising: at least one unit of formula (FS): Z-Si—(R 0 ) a —O (3-a)/2 wherein: a=0, 1 or 2, R 0 , identical or different, represents an alkyl, cycloalkyl, aryl, vinyl, hydrogeno or alkoxy radical, Z, identical or different, is an organic substituent comprising at least one epoxy, alkenyl ether, oxetane, dioxolane, or carbonate reactive functional group, and at least two silicon atoms; (2) from 5 to 90% by weight, of at least one dental filler; (3) from 0.001 to 5% by weight of at least one heat-activatable polymerization or crosslinking initiator comprising a boron derivative of formula (I) or its solvated form(s): (A) x B(R′) y (I) wherein: the symbols R′ are identical or different and represent: a linear or branched C 1-12 , preferably C 1 –C 8 , alkoxy radical, optionally substituted with at least one electron-attracting element, or an electron-attracting group, a phenyl radical substituted with at least (i) an electron-attracting element, (ii) an electron-attracting group, or (iii) a saturated, unsaturated or aromatic, mono- or polycyclic, linear or branched C 1 –C 12 , optionally substituted with at least one element which is a halogen atom or a mono-, poly- or perhalogenated, linear or branched C 1 –C 12 alkyl radical, and an aryl radical containing at least two aromatic rings, optionally substituted with at least one electron-attracting element, or an electron-attracting group, two groups R′ are optionally linked to each other so as to constitute, with the boron atom to which they are attached, a 5- or 10-atom ring, it being possible for said ring to be saturated, unsaturated bridged or aromatic and to comprise one or more heteroatoms chosen from hydrogen, nitrogen and boron atoms, it being possible for the boron atom present in said ring to be substituted itself with a radical as defined for A or R′ in general formula (I); the symbols A represent independently of each other: a halogen atom, or a hydroxyl radical; x represents 0 or the integer 1 or 2 and y the integer 1, 2 or 3 with the sum of x+y being equal to 3.