Which one of the following metals makes up the largest proportion of alloy powder in the restorative material amalgam?

In restorative dental materials, amalgam consists primarily of a mixture of metals, each contributing to the material's overall properties. Silver is the metal that constitutes the largest proportion of the alloy powder in dental amalgam. The inclusion of silver enhances strength, durability, and corrosion resistance, making the amalgam more effective for dental restorations.

Silver acts to improve the mechanical properties and the clinical performance of the amalgam. It also plays a role in the setting reaction of the amalgam, where it combines with mercury to create a solid mass that can withstand the forces of chewing. In contrast, while other metals like copper, tin, and zinc are present in amalgam, they do not make up the largest proportion. Copper is often added to reduce corrosion and improve strength but is present in lower quantities compared to silver. Tin contributes to the malleability and workability of the amalgam, and zinc can help with the setting properties but is not predominant in the mixture.