Margin quality and microleakage of Class II composite resin restorations

A comparison using various composite resins and placement techniques is made of the margin quality and isotope microleakage of Class II composite resin restorations placed in extracted molars. Margin quality and isotope microleakage analyses of Class II restorations placed in extracted human molars were compared using various composite resins and placement techniques. At occlusal margins, the traditional (experimental) composite resin restoration placed by the incremental technique showed less microleakage than did the experimental (commercial) composite resin restoration placed by the bulk technique. In each group, the occlusal and proximal adaptations had significantly higher “excellent margin” than did the cervical adaptation. Thus, the marginal adaptation at the cervical aspect of conventional Class II composite resin restorations may present a problem with respect to microleakage.