Abstract
The effect of mercury to alloy ratio on the hardness of high copper amalgam restoration at the margin and center of the amalgam was examined. The hardness of amalgams made from lower mercury to alloy ratio was smaller than that prepared by the manufacture's recommendation. With higher mercury to alloy ratio, the resultant hardness was smaller, and differed from alloy to alloy. Some single compositional high copper amalgams had markedly smaller hardness than others, including low copper amalgams. Regardless of the alloy type and mercury to alloy ratio, the hardness at the margin of the amalgam was apparently smaller than that of the canter. This was more prominent in high copper amalgams.
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