Evaluation of Shear Bond Strength of a New Self-Adhesive Composite to Dentin

Today, much of the researches and innovations in dental materials are focused on simplification of the bonding procedures.The aim of this study was to assess the shear bond strength(SBS) of a new self-adhesive flowable composite(Class V Embrace Wetbond, Pulpdent, Watertown, USA) to dentin. In this in vitro experimental study, 40 intact human third molars were selected and randomly divided into 4 groups of 10 teeth. Group I(Control group): After etching and application of Excite Bond(Ex), Tetric Flow(TF) composite was injected into the plastic ring over the prepared dentin surface and light cured(Etch/Ex/TF).Group II:After etching and application of Ex, Embrace Wetbond(EW) composite was injected into the plastic ring and light cured(Etch/Ex/EW).Group III:After etching, EW was injected into the plastic ring and light cured(Etch/EW). Group IV:EW was injected into the plastic ring and light cured according to manufacturer's instruction (EW).The data were analysed by ANOVA and Scheffe tests. The mean SBS and Standard deviations for groups I,II,III,IV were 13.380.82,9.991.30,2.420.58 and 3.080.85 MPa respectively.Statistical analysis revealed that:1.The mean SBS of EW composite in groups II,III,IV was significantly lower than groups I(P<0.05).2.The mean SBS of EW composite in group III and IV was significantly lower than group II(P<0.05).3.The mean SBS of groups III,IV were not significantly different(P>0.05). Bond strength of EW composite without application of bonding agents was much lower than TF composite combined with Ex bond.Application of EW composite over the total etch adhesive improved SBS.Application of EW composite over the etched dentin did not improve SBS.