[In vivo study of small class II composite fillings].

This clinical trial aimed at studying the medium term performance in routine clinical practice of drop-shaped Class II resin composite restorations. 111 preparations were completed with the Sonicsys micro-tips (KaVo) and filled with either of two light-cured composites (Tetric Flow, Tetric Ceram, Vivadent, Schaan, Liechtenstein) by 11 dentists in a university clinic. The restorations were evaluated after half a year and then annually, using the US Public Health Service criteria. After one to three years of service nearly all restorations were clinically successful and acceptable for continued use. In four cases, incomplete caries excavation was the cause of failure. We conclude that the drop-shaped Class-II-resin composite restoration should be considered a routine operative treatment for small proximal lesions in posterior teeth.