effect of trituration time on the compressive strength of an Iraqi amalgam alloy

In order to evaluate the effect of Trituration time on the compressive strength and working time in Iraqi amalgam, twenty one specimens were divided into three groups of seven specimens per group. Group I was triturated for 25 second, group II was under triturated for 15 sec, and group III was over triturated for 35sec. The compressive strength was tested after 1 and 24 hr. after mixing. The under triturated specimens exhibited inferior compressive strength than for the other 2 groups. The working time was more than the other groups. To seek for an optimum triturated time it seems that triturating for 25sec offers an amalgam mass of optimum compressive strength and at the same time acceptable working time