99mTc in the evaluation of microleakage of composite resin restorations with SonicFillTM: in vitro study.

Abstract

Introduction: The composite SonicFillTM (Kerr/Kavo) recently introduced in the market is indicated for posterior restorations, with a single increment up to 5mm due to reduced polymerization shrinkage, thus reducing working time. Aim: Evaluation of marginal microleakage with SonicFillTM. Method and materials: In this in vitro experimental study, were sectioned thirty noncarious human molars in occluso-cervical direction. Class V cavities were prepared on the buccal or lingual surfaces of each tooth with gingival margin walls in enamel and dimensions: 4 mm mesiodistally, 3 mm occlusogingivally and 3 mm depth. The specimens were divided in 4 groups: group 1 - restored with SonicFillTM (Kerr/Kavo), group 2 - restored with FiltekTM Supreme XTE (3M ESPE), group 3 – the cavities were not restored; group 4 – restored with SonicFillTM (Kerr/Kavo). In groups 1, 2 and 4 the enamel is conditioned with 37% orthophosphoric acid and applied the self-etch adhesive system ClearfilTM SE BOND (Kuraray). The specimens were stored in distilled water at 37ºC for 7 days. Followed thermocycling: 500 cycles between 5ºC and 55ºC with a dwell time of 30 seconds. After immersed for 3 hours in a solution of 99mTc-Pertechnetate the radioactivity was assessed with a gamma camera. The nonparametric Kruskal-Wallis and Mann-Whitney test with Bonferroni correction at a significance level of 5% were used for the statistical analyses. Results: There are significative differences between the positive and negative control groups and between these and experimental groups (p <0.05). There are no statistically significant differences between the specimens restored with SonicFillTM and FiltekTM Supreme XTE. Conclusion: The new composite SonicFillTM and FiltekTM Supreme XTE didn’t show difference concern to the dye penetration. The SonicFillTM restorative system doesn’t show influence in what concerns to microleakage.