Patent ID: 8455566

Claim:
An uncured dental composite material comprising (a) a composition comprising at least one compound of the formula: (b) at least 10 wt % radioopaque filler; and (c) a polymerization initiator; wherein with regard to Formula I: (i) n is in the range of from 1 to 5; (ii) R 1 and R 2 are each methyl; (iii) Z 1 and Z 2 are each independently selected and are represented by the formula and (iv) R 3 and R 4 are each independently selected and are represented by the formula wherein: (A) for groups Z 1 and Z 2 , X and Y are each H; for groups R 3 and R 4 , q=0, r=1-5 and s=5; R 5 and R 6 are each or (B) for groups Z 1 and Z 2 , X and Y are either H or methyl, providing that X and Y are not the same; for groups R 3 and R 4 , q=1-11, r=0, s=0, X and Y are either H or methyl, providing that X and Y are not the same; R 5 and R 6 are each wherein a and b are each independently an integer in the range of 0 to 6 and a +b=2-6; or (C) for groups Z 1 and Z 2 , X and Y are either H or methyl, providing that X and Y are not the same; for groups R 3 and R 4 , q=1-11, r=0, s=0, X and Y are either H or methyl, providing that X and Y are not the same; R 5 and R 6 are each