Failure at the Margin of Amalgams as Affected by Cavity Width, Tooth Position, and Alloy Selection

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Abstract
The effects of alloy, cavity width, and tooth position on failure rate at the margins of 429 two-year-old Class II amalgams were analyzed. Interpretation of the results from a factorial design indicated that: (1) There were significant differences among alloys; (2) conservative preparations exhibit less breakdown than wider preparations; and (3) there was less failure in lower premolars than in other posterior teeth.

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