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Influence of adhesive properties on resin-dentin bond strength of one-step self-etching adhesives

Abstract:

Purpose: To evaluate the association between the resin-dentin bond strength (microtensile bond strength, µTBS) and the physical properties (ultimate tensile strength [UTS] and microhardness [VHN]) of the cured adhesive resin using five commercial one-step self-etching systems. Materials and Methods: Futurabond NR, Go, G Bond, 1-step All Bond SE, and Clearfil S3 Bond were applied on flat superficial dentin surfaces. Each adhesive system was applied in five teeth. A resin buildup was then made. After 24 h, resin-dentin beams (0.9 mm2) were prepared to be tested immediately at 0.5 mm/min. For the UTS measurement, hourglass specimens were prepared with each adhesive system (n = 5) to be tested under tensile stress at 0.5 mm/min. The fractured specimens from the UTS test were taken to a Vickers microhardness tester (25 gf/20 s). µTBS, UTS, and VHN values were submitted to a one-way ANOVA and Tukey’s test (α = 0.05) for pairwise comparisons. Correlations between µTBS, UTS and VHN were analyzed using the Pearson product moment correlation test (α= 0.05). Results: Significantly higher µTBS values were observed for 1-step All Bond SE, and Clearfil S3 Bond (p > 0.05). The adhesive All Bond SE showed the highest UTS mean among all systems (p < 0.05). The adhesives All Bond SE and G-Bond showed the highest microhardness mean among all systems (p < 0.05). A strong (r = 0.93) and significant (p = 0.021) correlation was only found between the µTBS and UTS values. Conclusion: The ultimate tensile strength of one-step self-etching systems correlates with the resin-dentin bond strength values. © 2011 by Quintessence Publishing Co Inc.