The gamma 2 phase of amalgam weakens its strength and is the result of a combination of which two metals?

The gamma 2 phase of amalgam specifically refers to a phase that forms when tin and mercury combine during the setting process of dental amalgam. This phase is known for its detrimental effect on the overall strength and integrity of the amalgam material. It is less resistant to corrosion compared to other phases, particularly the gamma 1 phase (which is formed from silver and mercury) and the gamma phase (composed of silver and tin).

In dental amalgams, the presence of the gamma 2 phase is often associated with a decrease in longevity and an increased risk of failure. This phase can lead to the degradation of the amalgam restoration over time, making it crucial to minimize the amount of tin that comes into contact with mercury during amalgam preparation to enhance the restorative material's performance.

The other options presented involve different combinations of metals that contribute to various phases within the amalgam, but they do not specifically relate to the problematic gamma 2 phase, reinforcing why tin and mercury is the answer that encompasses the specific concern about amalgam's diminished strength.