Eighty-two restorations with a new posterior restorative material showed good wear resistance on the occlusal surfaces after 2 years of service. The loss of substance averaged 30-50 micron, which is below the clinically detectable level. Inferior contact points were frequently registered, reflecting the problems with inadequate matrix systems. Clinically relevant problems were all related to the quality of the contact area.
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Leidal et al. (1985) studied this question.
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