Which metal in amalgam helps to enhance strength and resistance to corrosion?

Copper is recognized for enhancing both the strength and corrosion resistance of dental amalgam. When added to the amalgam mixture, copper contributes to the formation of stable compounds that increase the mechanical properties of the alloy, making it more durable under conditions typically encountered in the oral environment.

Additionally, copper helps to reduce the tendency of amalgam to corrode and dissolve over time, which is crucial for maintaining the integrity of restorations and prolonging their lifespan. The presence of copper also aids in minimizing the phase that can contribute to the degradation of the amalgam, leading to better overall performance compared to amalgam with lower copper content.

Other metals present in amalgam, such as silver, tin, and zinc, play distinct roles in the material's properties. Silver primarily contributes to the amalgam's initial strength and luster, while tin influences flow and workability during mixing. Zinc can help prevent oxidation but does not significantly enhance strength or corrosion resistance in the same way copper does.