Dental materials based on oligomers or polymers obtained by ring-opening metathesis polymerization

The invention relates to dental compositions containing(a) 5 to 70% by weight, based on (a) + (b) + (d), of oligomers and / or polymers,(b) 0 to 95% by weight, based on (a) + (b) + (d), fillers,(c) 0.01 to 3% by weight, based on (a), of at least one initiator or of an initiator system,(d) from 0 to 95% by weight, based on (a) + (b) + (d), of conventional auxiliaries, including pigments, radiopaque additives and / or thixotropic auxiliaries, characterized in that 5 to 100 wt .-% of component (a) oligomers or polymers of the general formula or. are, in which mean:X is CH 2, NH, O or S,m is 10 to 20,000,n a value of 10 to 20,000R1 is -CHR4-CHR5-, -CR4 = CR5-, C2-C10-alkylene, C2-C10-alkenylene, C2-C10-epoxyalkylene, or C6-C15-o-arylene which is represented by alkyl, OH, NH2, C ( O) OR6, C (O) NHR6, PO3H, SO3H, Cl, Br or F can be substituted,R1 'is -CHR4-CHR5-, -CR4 = CR5-,R2, R3, R4, R5 is H, C1-C15-alkyl, C (O) OR6, C (O) NHR6, PO3H, SO3H, OH andR6 is H or a linear, branched or cyclic C1-C30 alkyl or aryl radical which may contain 0-10 O or N atoms and 0 to 5 carbonyl groups and is saturated or unsaturated, provided that these compounds Contain groups which lead by radical or cationic polymerization or by a cement reaction to a curing of the masses. The dental materials are suitable for the production of filling materials, fixing cements, inlays, onlays, veneers, temporary crown and bridge materials, dental materials and impression materials. In the case of free-radically curing compositions, there is little volume shrinkage on hardening, while better mechanical properties are obtained in the case of cement compositions.