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It is well known that the mercury-alloy ratio and trituration time greatly influence the physical properties of the amalgam, and there are a great number of studies about this. Nowadays, the standard approach to this problem is that the optimum trituration time varies according to the size of the mix, and trituration time should be extended as the size of mix increases. Reference books [1-2] and manufacturer's instructions on the use of alloys also advise the same approach. However, few stydies have been made to check the validity of this approach. Recently, attention has been called to the fact that the trituration sound suddenly changes during mechanical trituration of an amalgam. The following report has appeared opposing the previously described established theory [3] : The time to sound change between the start of trituration and the point of sound change is shortened with the increase in the size of mix, indicating that the trituration time should be shortened as the volume increases. This report was also confirmed by a visual observation in the amalgam mix just after the point of soundchange and was in contradiction with the generally accepted theory. In order to explicate which theory is true, the generally accepted theory or the new opposing theory, concerning correlation between size of mix and trituration time, the authors investigated this problem from the aspect of the physical properties of the amalgam. That is, for the purpose of reaching a correct conclusion, the experimental order was arranged at random statistically so that the relation between the size of mix and tirituration time could be analyzed in detail.

Effects of Size of Mix and Trituration Time on Physical Properties of Amalgam