Which statement about the gamma and gamma-2 phases is correct?

Which statement about the gamma and gamma-2 phases is correct?

• A. Gamma phase is strongest; Gamma-2 is weakest
• B. Gamma-2 phase is strongest; Gamma is weakest
• C. Both are equally strong
• D. Neither exists

Answer: (A)

In dental amalgam, the strength and durability come from the different phases that form during setting. The gamma phase, which is the silver-mercury compound, provides the alloy’s highest strength and corrosion resistance. The gamma-2 phase, the tin-mercury compound, is much weaker and more susceptible to corrosion in the oral environment. This susceptibility leads to porosity and weakening of the material over time. So the statement that the gamma phase is the strongest and gamma-2 is the weakest accurately describes their relative properties.

In dental amalgam, the strength and durability come from the different phases that form during setting. The gamma phase, which is the silver-mercury compound, provides the alloy’s highest strength and corrosion resistance. The gamma-2 phase, the tin-mercury compound, is much weaker and more susceptible to corrosion in the oral environment. This susceptibility leads to porosity and weakening of the material over time. So the statement that the gamma phase is the strongest and gamma-2 is the weakest accurately describes their relative properties.