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Abstract
The purpose of this study was to clarify the effect of the packing factor of commercial alloys on mercury content for trituration and strength of dental amalgams. Three spherical and two flaked alloys were subjected to various static compacting pressures in a cylindrical steel mold, and their height under various pressures was measured in order to calculate the packing factor. Cylindrical amalgam specimens were prepared from triturated masses having various mercury contents under a thrusting pressure of 60 kg/cm2, and their 2-day tensile strength was measured diametrally.
The optimum mercury content for the trituration could be estimated from the packing factor of the alloys without measuring the strength of a number of amalgam specimens. It was the amount of mercury that fills the space between the alloy particles compacted under the pressure of 60 kg/cm2.