Which two metals react during the gamma 2 phase of amalgam formation?

The gamma 2 phase of amalgam formation is specifically associated with the reaction between tin and mercury. During the setting process of dental amalgam, mercury reacts with tin to form gamma 2 tin-mercury compounds. This phase is significant because it plays a crucial role in the overall properties of the amalgam, including its strength and corrosion resistance. Understanding this reaction is essential for dental professionals, as controlling the composition and the reactions involved can lead to improvements in the durability and effectiveness of dental restoratives.

In the context of the other options, gold and mercury do not form a significant phase within dental amalgam. Silver and tin do interact in the formation of dental alloys, but they do not specifically relate to the gamma 2 phase. Copper and zinc, while sometimes present in dental materials, are not involved in the formation of the gamma 2 phase of dental amalgam. Therefore, the reaction between tin and mercury is the key interaction occurring during this specific phase, confirming its importance in the properties of amalgam.