Question

Which of the following statements is true of high-copper amalgams in contrast to low-copper amalgams?

a) High-copper amalgams set faster
b) Low-copper amalgams have higher corrosion resistance
c) High-copper amalgams have better marginal integrity
d) Low-copper amalgams have higher creep resistance

Answer 1

The statement that high-copper amalgams have better marginal integrity compared to low-copper amalgams is true, providing superior clinical performance and reducing microleakage.

Step-by-step explanation:

Among the choices given regarding high-copper amalgams compared to low-copper amalgams, the true statement is that high-copper amalgams have better marginal integrity. High-copper amalgams are known for providing superior clinical performance compared to their low-copper counterparts. Superior marginal integrity means that the amalgam restorations are better at sealing the margins of the cavity, preventing microleakage and subsequent secondary caries.

Low-copper amalgams do not set faster, have higher corrosion resistance, or have higher creep resistance. In fact, high-copper amalgams are designed to reduce the phase that causes creeping and to enhance corrosion resistance.