Dental compositions are described comprising an addition-fragmentation agent of the formula:
wherein
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-;
Q is a linking group have a valence of m+1;
Z is an ethylenically unsaturated polymerizable group;
m is 1 to 6;
each X
1
is independently —O— or —NR
4
—, where R
4
is H or C
1
-C
4
alkyl; and
n is 0 or 1.
Also described are dental articles prepared from a dental composition comprising an addition-fragmentation agent and methods of treating a tooth surface.
本文描述了一种牙科组合物,其中包括一个式子为的加成-断裂剂:其中R1、R2和R3各自独立地是Zm-Q-、(杂)烷基或(杂)芳基,但至少其中一个是Zm-Q-;Q是具有价为m+1的连接基;Z是
乙烯基不饱和可聚合基团;m为1至6;每个X1分别是—O—或—NR4—,其中R4是H或C1-C4烷基;n为0或1。还描述了从含有加成-断裂剂的牙科组合物制备的牙科制品和治疗牙齿表面的方法。