Which of the following phase is virtually eliminated in high copper amalgam:
**Core Concept**
The question pertains to the classification of amalgam restorations based on their copper content, which affects the phase formation in the amalgam. The correct answer is related to the elimination of a specific phase due to high copper content.
**Why the Correct Answer is Right**
High copper amalgam is known to reduce the formation of gamma-2 (γ2) phase. This is because copper ions inhibit the formation of the γ2 phase, which is rich in mercury. As a result, the γ2 phase is virtually eliminated in high copper amalgam, leading to improved corrosion resistance and durability. The γ2 phase is responsible for the corrosion of amalgam, and its elimination improves the overall clinical performance of the restoration.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because the γ1 phase is not eliminated in high copper amalgam. The γ1 phase is rich in silver and is not affected by the copper content.
**Option B:** Incorrect because the γ2 phase is the one that is virtually eliminated in high copper amalgam, not the α phase.
**Option C:** Incorrect because the ε phase is not directly affected by the copper content in amalgam.
**Clinical Pearl / High-Yield Fact**
To remember the phases eliminated in high copper amalgam, use the mnemonic "G2 Gone": Gamma-2 phase is virtually eliminated in high copper amalgam.
**Correct Answer:** B. Gamma-2 phase.