Enamel Micro-cracks Produced around Restorations with Flowable Composites.

In this study, enamel micro marks produced around flowable composite restorations were observed using a stereomicroscope and a scanning confocal laser microscope (SCLM). The effects of polymerization shrinkage, mobility of composite and polishing period after filling on the incidence of marginal enamel micro-cracks were examined. Enamel micro- cracks were observed on all of the composite restorations when the restoration was polished immediately after filling. Enamel micro cracks distributed approximately parallel to the cavity margin and located 0.01-0.3 mm from the restored cavity margin. The occurrence of enamel micro-cracks was higher in conventional hybrid composite restorations than in flowable composites, and when polished 15 minutes after filling (as compared to 24 hours after filling). [ABSTRACT FROM AUTHOR]