Patent ID: 8329776

Claim:
A dental composition comprising a) a hardenable compound (A1), b) a filler (B1) and c) an initiator (C1) being able to initiate hardening of compound (A1), compound (A1) having the structure A-(-S1-U-S2-MA) n , with A being a connector element comprising at least one unit, S1 being a spacergroup comprising at least 4 units connected with each other, S2 being a spacergroup comprising at least 4 units connected with each other, the units of A, S1and S2 being independently selected from CH 3 —,CH 2 —,—O—, —S—, —NR 1 —, —CO—, —CR 1 ═, —N═, —CR 1 R 2 —, with R 1 and R 2 independently selected from hydrogen, alkyl, substituted alkyl, alkenyl, cycloalkyl, substituted cycloalkyl arylalkyl, aryl or substituted aryl, wherein these units can form linear, branched or cyclic structures such as alkyl, cycloalkyl, aryl, ester, urethane or amide groups, U being an urethane, urea or amide group connecting spacergroups S1 and S2, MA being an acrylate or methacrylate group and n being 3 to 6.