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

Statement of Problem: The integrity of adhesive bond at the tooth/resin interface performs an essential role in the clinical success and survival of restorations. Objectives: The purpose of this study was to compare microleakage of Class II cavities restored with total-etch or self-etch adhesives and different bulk-fill composites. Materials and methods: Conventional class II cavities were prepared on forty sound human premolar teeth with approximately same size and shape. Half of the cavities restored with a sonic-resin placement system (SonicFill, Kerr), and the other half of the cavities with Tetric N-Ceram (TNC) composite with total-etch; Optibond Solo Plus or self-etch; Optibond XTR, adhesives. The samples stored in distilled water at 37 ° C for 24 hours, and then specimens were under 1000 thermal cycles. The teeth were covered with two layers of nail varnish except for one mm around gingival margins, and then were dipped in glass vials for 48 h at 37°C in a neutral-buffered 2% methy¬leneblue solution. After removal from the dye, the teeth were rinsed 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 super¬natant from each was then analysed in a UV-Visible spectro¬photometer after a kinetic assay at 550 nm wavelength using concentrat¬ed nitric acid as the blank. So dye extraction was conducted to investigate the leakage test. Data were analysed 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 amount of microleakage was not significantly different among experimental groups (P>0.05). Conclusions: Both of the bulk-fill composites with various adhesives had the same microleakage.