Challenging Resin-Dentin Bonds in Two Storage Media

Objectives: To evaluate the longevity of resin-dentin bonds of three adhesives using two different storage media. Methods: Flat dentin surfaces from extracted human third molars were bonded with: a two-step, etch-and-rinse self-priming adhesive (Single Bond), a two-step, self-etching adhesive (Clearfil SE Bond), and a single-step, self-etching adhesive (One-Up Bond F). Composite build-ups were constructed. The bonded teeth were sectioned into beams and stored under two conditions: distilled water or mineral oil. After storage periods of 24 h, 3 month or 1 year, the beams were tested for microtensile bond strengths. Results were analyzed by ANOVA and Student-Newman-Keuls tests (p>0.05). Fractographic analysis was performed by SEM. Results: Mean (SD) MTBS values (MPa) for each group are shown in the table: Same letter indicates no differences in row when maintained in the same storage media and same number indicates no differences in columns (p>0.05). Conclusion: Although the dentin bond strength of all the adhesives fell over time, SE Bond fell the least. (CICYT/FEDER MAT 2004-06872-C03-01; RED CYTED VIII.J)