Résumé
To assess the influence of various canal-drying techniques on the push-out bond strength between radicular dentine and both MTA Fillapex and iRoot SP sealers. Eighty extracted single-root teeth were instrumented with ProTaper Universal rotary instruments to a size F4. The teeth were randomly assigned to 1 of 4 groups as follows: group 1, excess fluid in the canals was removed using a Luer vacuum adapter; group 2, the canals were dried with a single paper point; group 3, the canals were dried with 3-5 paper points, and group 4, the canals were rinsed with 95% ethanol and then dried with 3-5 paper points. In each group, the specimens were subgrouped according to root canal sealer into either subgroup A [MTA Fillapex] or subgroup B [iRoot SP sealer]. Horizontal sections [thickness 1 +/- 0.1 mm] were obtained from each specimen and a push-out test was performed using a universal testing machine at a crosshead speed of 1 mm/min on root slices. Statistical analysis was done using the Kruskal-Wallis test and Dunn's test for pair-wise comparisons. P < 0.05 was considered statistically significant. Canals dried with only 1 paper point and obturated with the iRoot SP sealer [subgroup 2B] showed significantly higher bond strengths to the root canal wall compared to all other subgroups [p < 0.05], except for subgroup 1B [p > 0.05].Conclusions: The canal-drying technique influenced the adhesive bond strength between calcium silicate-based root canal sealers and the root canal wall