What does a higher copper content in amalgam contribute to?

• A. Reduced expansion
• B. Better handling properties
• C. Less corrosion
• D. Increased strength

Answer: (C)

A higher copper content in dental amalgam significantly contributes to less corrosion. This is because copper enhances the corrosion resistance of the amalgam material. When mercury is combined with copper, it forms a more stable reaction that reduces the susceptibility of the amalgam to chemical degradation over time. The presence of copper results in better mechanical properties and limits the formation of gamma-2 phase, which is known to be prone to corrosion.

This increased corrosion resistance is particularly important in dental applications, as it helps maintain the integrity of the restoration and reduces the risk of failure over time. Therefore, the impact of higher copper content in amalgam on corrosion resistance is a key factor in its performance as a restorative material in dentistry.