Microleakage Evaluation of Bulk-fill Composites Used with Different Adhesive Systems

Statement of Problem: The integrity of adhesive bond at the tooth/resininterface performs an essential role in the clinical success and survival ofrestorations.Objectives: The purpose of this study was to compare microleakage of ClassII cavities restored with total-etch or self-etch adhesives and different bulk-fillcomposites.Materials and methods: Conventional class II cavities were prepared on fortysound human premolar teeth with approximately same size and shape. Halfof the cavities restored with a sonic-resin placement system (SonicFill, Kerr),and the other half of the cavities with Tetric N-Ceram (TNC) composite withtotal-etch; Optibond Solo Plus or self-etch; Optibond XTR, adhesives. Thesamples stored in distilled water at 37 ° C for 24 hours, and then specimenswere under 1000 thermal cycles. The teeth were covered with two layersof nail varnish except for one mm around gingival margins, and then weredipped in glass vials for 48 h at 37°C in a neutral-buffered 2% methy‌lenebluesolution. Afterremoval fromthe dye, the teeth wererinsed and the varnish was removed, and stored individually in a glass vial containing 65% nitric acid. The vials were centrifuged, and 100 μl of the super‌natant fromeach was then analysed in a UV-Visible spectro‌photometer after a kineticassay at 550 nm wavelength using concentrat‌ed nitric acid as the blank.So dye extraction was conducted to investigate the leakage test. Data wereanalysed by ANOVA test (P<0.05).Results: The highest and lowest microleakage was related to self-etch/SonicFill and total-etch/Tetric N-Ceram groups respectively. The amountof microleakage was not significantly different among experimental groups(P>0.05).Conclusions: Both of the bulk-fill composites with various adhesives had thesame microleakage.