Photopolymerizable dental composition for preparing crowns and bridges

Claim 2

A photopolymerizable dental composition for preparing crowns and bridges with a content of (a) polyfunctional (meth)acrylate, (b) organic and/or inorganic filler, (c) an initiator system, characterized in that the polyfunctional (meth)acrylate comprises a reaction product of a polyisocyanate and a diglycidyl (meth)acrylate of a bisphenol or oligomers thereof and a liquid polyfunctional (meth)acrylate for dissolving said reaction product.

Claim 3

A composition according to Claim 1, characterized in that the initiator is a photo initiator, preferably a combination of a ketone and/or an α,β-diketone and an amine or an amine salt.

Claim 4

A composition according to Claim 2, characterized in that the amine component is dimethylaminoethyl (meth)acrylate or a(metlyacrylic acid salt thereof; or dimethylamino-neopentyl(meth)acrylate or a (meth)acrylic acid salt thereof or triethanol amine or a (meth)acrylic acid salt thereof.

Claim 5

A composition according to one of Claims 1 to 3, characterized by a content of a silane-treated pyrogenic silica as inorganic filler.

Claim 6

A composition according to one of Claims 1 to 4, characterized in that the organic filler has been obtained from a composition comprising a silane-treated pyrogenic silica and a reaction product of a diisocyanate and a diglycidyl(meth)acrylate of a bisphenol or oligomers thereof.

Claim 7

A composition according to one of the Claims 1 to 5, characterized in that the inorganic filler in said dental composition comprises glass, which is contained inside and/or outside said organic filler.

Claim 8

A composition according to one of the Claims 2 to 6, characterized in that said photoinitiator is a combination of camphoroquinone and an amine.

Claim 9

A composition according to one of Claims 2 to 6, characterized in that said photoinitiator is a combination of a diketone and an amine salt.

Claim 10

A composition according to one of Claims 1 to 8, characterized by a combination of an inorganic filler comprising silane-treated pyrogenic silica and an organic filler, comprising silane-treated pyrogenic silica dispersed within the crosslinked polymer matrix.

Claim 11

A composition according to one of Claims 1 to 8, characterized by a combination of an inorganic filler, comprising silane-treated pyrogenic silica and silane-treated glass and an organic filler, containing silane-treated pyrogenic silica and optionally silane-treated glass dispersed within the crosslinked polymer matrix.

Claim 12

A composition according to one of claims 1 to 10, characterized by (a) 5 to 95 parts by weight of a polyfunctional (meth)acrylate comprising (aa) 0.05 to 5 parts by weight of the reaction product of the polyisocyanate and the diglycidyl(meth)acrylate of a bisphenol or oligomers thereof and (ab) 1 part by weight of a liquid polyfunctional (meth)acrylate for dissolving said reaction product (aa); (b) 95 : 5 parts by weight of a filler composition comprising (ba) 10 to 90 weight % of an inorganic filler comprising silaned pyrogenic silica and silaned glass and (bb) 90 to 10 weight % of a cross-linked organic filler comprising (bba) 90 to 10 weight % of a polymer matrix obtained by copolymerization of the polyfunctional(meth)-acrylates (a) and/or other solid and liquid (meth)acrylates, preferably with the photoinitiator system (c) and (bbb) 10 to 90 weight % of an inorganic filler comprising silaned pyrogenic silica and optionally silaned glass whereby the filler composition contains a total amount of 20 to 90 weight % of silaned pyrogenic silica and whereby the total amount of silaned glass is 10 to 60 weight % based on the total amount of inorganic filler and (c) a photoinitiator system of a ketone or a-diketone and an amine or an amine salt.