In vitro wear data were determined for nine experimental composites and compared with two-year clinical data. The in vitro tests included single-pass wear and two-body abrasion. The in vivo data were obtained between 1978 and 1980 for 54 class 2 posterior composite restorations in 25 patients. Correlations between the in vitro and in vivo data were found with values of alpha less than 0.08.
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Powers et al. (1983) studied this question.
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