What is the main advantage of using copper in dental amalgams?

The main advantage of using copper in dental amalgams is that it increases strength. Copper serves to improve the mechanical properties of the amalgam by enhancing its compressive strength and reducing the likelihood of fracture during functional use within the tooth. This increased strength allows the amalgam restoration to withstand the forces of occlusion and grinding that occur during normal chewing, making it a durable choice for posterior restorations.

This strength enhancement is particularly important because amalgams are often used in areas of the mouth that experience significant wear and stress. By incorporating copper, the overall performance and longevity of the restoration can be significantly improved, leading to better patient outcomes. Additionally, the incorporation of copper helps to reduce the formation of gama-2 phase, which is associated with corrosion and reduced strength, further contributing to the overall robustness of the amalgam.