Patent ID: 8921475

Claim:
A hardenable dental composition comprising component (A) comprising a cationically hardenable compound, wherein component (A) has on average at least 2 aziridino groups or more and a molecular weight of at least about 500, component (B) comprising an initiator being able to initiate the hardening reaction of the cationically hardenable compound, and component (C) comprising a filler, wherein the filler comprises a filler body and a filler surface, the filler surface comprising side groups with polar moieties, the polar moieties being attached to the filler surface by a silane coupling agent being characterized by the following formula A m -B—Si(R 1 ) n (OR 2 ) 3-n wherein A represents a polar moiety, B represents a spacer group, R 1 represents an alkyl group or an aryl group, and R 2 represents an alkyl group, with m=1, 2, 3 or 4 and n=0, 1 or 2; wherein the polar moieties are selected from thioles, phosphines, amines, amide, urethanes, thiiranes and combinations thereof; and wherein the hardenable dental composition is characterized by the following parameter after hardening: Tensile Strength (according to DIN 53504): at least about 3.2 MPa.