Effect of storage time on microtensile bond strength between quartz fiber post and composite core after different post surface treatments

AIM: The aim was to evaluate the influence of water storage on fiber post-resin composite adhesion after different postsurface treatments. MATERIALS AND METHODS: Forty-two fiber posts were used. Half of them were treated by hydrogen-peroxide and the other half were sandblasted. The adhesive (Single Bond, 3M, USA) was applied on the post. Core was built-up using flowable composite (Ælite Flow, Bisco, USA). The specimens were divided into eight groups. Group 1 was treated with H(2)O(2). Groups 2–4 were treated with H2O2 but stored for 3, 6, and 9 months, respectively. Groups 5–8 were sandblasted and stored for 0, 3, 6, and 9 months. μTBS was measured and data analyzed using one-way ANOVA and Tukey HSD. The fractured surfaces were evaluated by a stereomicroscope. The morphology of interfaces was assessed under SEM. H(2)O(2)-treated groups showed higher bond-strength. RESULTS: The effect of “surface-treatment method” and “storage-time” was significant (P<0.0001), but there was no significant difference for their interaction effect (P=0.05). Water aging significantly decreased μTBS. CONCLUSIONS: Water aging significantly decreased microtensile bond strength regardless of the type of post surface treatment.