- DENTAL MATERIALS
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 in 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 1mm2. The microtensile test was carried on a universal testing machine operated at a crosshead speed of 1mm/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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