Bond Strength Comparison of One-Step/Two-Step Self-Etch Adhesives to Cavity Floor Dentin after 2.5 Years Storage in Water

In recent years, decrease in dentin bond strength of one-step self-etch adhesives after long-term water storage has been reported; however, the flat dentin surface of the extracted tooth has been used to carry out the bond strength tests in the majority of the previous studies. Objectives: The purpose of this study was to compare the micro-tensile-bond-strength (μTBS) of three one-step self-etch adhesives and a two-step self-etch adhesive on the cavity floor dentin after 2.5 years storage in distilled water. Materials and Methods: Adhesives were used in this study: three one-step self-etch adhesives (Primefil, GBOND PLUS and Beauti Bond), and one two-step self-etch adhesive (Clearfil SE Bond), which was used as the control. Bowl-shaped cavities of extracted human incisors were treated with each adhesive and filled with each flowable resin composite from the same manufacturer. The specimens were stored in distilled water at room temperature for two and a half years. The beam samples were made and subjected to μTBS test using the tabletopmaterial- tester. The data were statistically analyzed using one-way ANOVA. Results: The μTBS value of G-BOND PLUS was higher than that of other adhesives; however, the results of ANOVA showed no significant differences in μTBS values among all adhesives. Conclusion: There was no significant difference between one-step and two-step on the bond strength of selfetch adhesives to the cavity dentin floor after a storage period of 2.5 year.