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The redistribution of mercury as observed in the phase transformations in amalgams.

Summary An investigation has been conducted to observe the effect of heat treatment on mercury loss and structural transitions in clinically used amalgams, as well as the individual phases composing dental amalgam. Pure AgZHg, readily loses mercury and transforms to the 61 phase while the remaining amalgams are somewhat more stable. Since essentially no weight loss is observed in clinically used alloys, the mercury, liberated by the yl decomposition, reacts with excess Ag,Sn to form a self-perpetuating reaction, explaining the increases in the 81 and yz phases in the Ag,Sn and “True Dentalloy” amalgams. That is, the mercury has redistributed itself within the amalgam.