abstract |
Dental compositions are described comprising an addition-fragmentation agent of the formula: n n n n n n n n n n n n wherein n R 1 , R 2 and R 3 are each independently Z m -Q-, a (hetero)alkyl group or a (hetero)aryl group with the proviso that at least one of R 1 , R 2 and R 3 is Z m -Q-; n Q is a linking group have a valence of m+1; n Z is an ethylenically unsaturated polymerizable group; n m is 1 to 6; n each X 1 is independently —O— or —NR 4 —, where R 4 is H or C 1 -C 4 alkyl; and n n is 0 or 1. n n n n n Also described are dental articles prepared from a dental composition comprising an addition-fragmentation agent and methods of treating a tooth surface. |