High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?
Correct answer: D. Have less marginal breakdown
- A. Have less resistance to tarnish and corrosion
- B. Are workable at lower Hg-alloy ratio
- C. Have a higher ratio of tensile to compressive strength
- D. Have less marginal breakdown
Explanation
High-copper amalgams eliminate or greatly reduce the weak gamma-2 phase, so they show less corrosion-related marginal breakdown. They may also use a lower mercury-to-alloy ratio, but reduced marginal breakdown is the principal advantage tested here.
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