many composites are superior to amalgam. A 1994 study by the prestigious
Clinical Research Associates group of Provo, Utah, looked at 21
dental filling materials over three years. They ranked each according
to wear, marginal adaptation (closeness of fit to the tooth),
surface smoothness, wear of opposing teeth, breakage and color
Eleven of the 21 filling materials were composites. They are called
direct placement composite resins. The ADA has been saying for
years that direct placement composite resins are inferior to amalgam
because they wear faster, have more recurrent decay and may increase
the need for root canals. The Provo study demonstrated that all
of these claims are untrue.
The results showed that recurrent decay and root canal therapy
did not happen often enough on all materials combined to even
be considered as significant.