ABSTRACT
AIM: To evaluate the influence of acid viscosity, endodontic sealer and root canal region on the push-out bond strength of a glass fibre post. METHODOLOGY: Seventy-eight single-rooted human teeth were selected (60 for push-out and 18 for scanning electron microscopy characterization, SEM, n = 13 per group). The root canals were prepared with a step-back technique and then filled with Endofill or AH Plus sealer. Teeth without root fillings were used as controls. The preparation of the post-space was to a length of 11 mm using standardized rotary instruments. The root dentine was treated with 37% phosphoric acid (gel or liquid). The fibre posts (Reforpost) were silanized, and resin cement (Enforce) was used for luting procedures. Each root was cross-sectioned, and samples from the cervical and apical regions were subjected to a push-out bond strength test. Specimens from each group were sectioned longitudinally and subjected to SEM characterization for the dentine/cement/post interface. Statistical analysis for push-out tests was carried out using factorial anova followed by Tukey's test (P < 0.05). RESULTS: The three factors under evaluation (acid, endodontic sealer and region) and their interaction significantly influenced bond strength values (P < 0.05). In general, liquid phosphoric acid had significantly higher bond strength values in the apical region (P < 0.05), with hybrid layer formation, while endodontic sealers reduced bond strength values compared to the control (P < 0.05). CONCLUSION: The use of a liquid acid etchant created higher bond strength values in the apical region.
