Abstract:
Objective: To evaluate the effect of pretreatment and aging process, by means of water storage, on microtensile bond strength of a self-adhesive resin composite to dentin. Materials and Methods: 72 extracted human molars were selected. Microtensile bond strength was evaluated using mid-coronal dentin. According to pretreatment methods, type of materials and water storage time, teeth were randomly divided into 4 groups; pretreatment dentin with Single Bond Universal followed by Filtek Z350 XT Flowable (control group), group without pretreatment followed by Vertise Flow, group with pretreatment with 37.5% phosphoric acid followed by Vertise Flow, and group with pretreatment with 37.5% phosphoric acid and Optibond Solo Plus followed by Vertise Flow. Each group was further randomly divided into 2 subgroups, total of 8 groups to be tested for 24 hours or 3 months. The specimens were tested for microtensile bond strength after water storage, and failure modes were recorded. Data were analyzed using two-way ANOVA and Bonferroni post hoc test (p=0.05). Results: The microtensile bond strength revealed the highest in group of dentin pretreatment with 37.5% phosphoric acid and Optibond Solo Plus followed by Vertise Flow at 24 hours (42.63±4.57 MPa) and the lowest in group without pretreatment followed by Vertise Flow at 3 months (23.39±3.88 MPa). Considering the effect of pretreatment, groups with pretreatment showed significantly higher microtensile bond strength than groups without pretreatment. In terms of influence of aging process, microtensile bond strengths were significantly decreased by water storage. Conclusion: Dentin pretreatment and water storage had effect on microtensile bond strength.
