Behavior of three high-Cu amalgams

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Abstract
Amalgams made from three single‐composition high‐Cu alloys of the same nominal composition were investigated for differences in creep behavior. The curves of creep vs. final Hg content for all three alloys showed a sudden creep increase (jump) at approximately 46% final Hg content. Previous studies have shown this creep jump to be associated with the initiation of the SnHg phase (γ2). The anticipated final Hg content in clinical restorations for two of these alloys is below the creep jump and γ2 would not be expected. On the other hand, the clinical Hg content for the third alloy was above its creep jump and γ2 would be expected. The effect on clinical behavior of this finding requires further investigation.

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