Effects of etching mode on bond strength of universal adhesives

What is it about?

Introduction: The aim of this study was to analyze the bond strength to dentin produced by new universal adhesive systems used in self-etch and etch-and rinse application modes. Materials and Methods: Sixty human teeth were divided into 6 groups according to the different universal adhesive systems: Scotchbond Universal (SBU - 3M ESPE), Clearfil Universal (CFU - Kuraray), Futurabond U (FBU - VOCO) Xeno Select (XS - Dentsply De Trey), Prime&Bond Elect (PBE – Dentsply Caulk) and All Bond Universal (ABU, Bisco). Then, the teeth were subdivided into 2 subgroups, according to the application mode: etch-and-rinse or self-etch. Composite crowns were built after application of the adhesive systems and the restored teeth were sectioned in both “X” and “Y” directions into sticks with a cross-sectional bonded area of approximately 1 mm2. The microtensile test was carried on a universal testing machine operated at a crosshead speed of 1 mm/min. Bond strength values were statistically evaluated using two-way ANOVA and the Tukey post-hoc test. Results: SBU, XS and ABU presented significantly higher bond strength values when applied on the etch-and-rinse mode (p < 0.05). CFU, FBU and PBE presented no significant difference in bond strength values between etch-and-rinse and self-etching groups (p > 0.05). Conclusion: The adhesive performance of Universal Adhesives was similar or higher when they were used in the etch-and-rinse mode in comparison with the self-etching mode. Keywords: Acid etching; Dental; Bond strength; Dental bonding; Universal adhesives

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