Effect of smear layer removal using different chelators on push-out bond strength of bioceramic sealer

Aim: The aim of this study was to evaluate the effects of phytic acid (IP6), ethylenediaminetetraacetic acid (EDTA) and glycolic acid (GA) used as a final irrigation solution on the push-out bond strength (POBS) of a bioceramic-based root canal sealer.

Methodology: The study included 60 single-root human mandibular premolars. After the teeth were decoronated, they were cleaned and shaped using the #25.08 Reciproc R25 rotary file. Throughout preparation, each canal was irrigated using 20 ml 5.25% sodium hypochlorite (NaOCl). The teeth were divided into 4 group, each consisting of 15 (n=15) according to the final irrigation agent [1% IP6, 10% CI, 17% EDTA, and distilled water (DW)]. The final irrigation protocol consisted of application of 5 ml chelating agent for 1 minute followed by 5 ml 5.25% NaOCl application. Root canals were filled using Well Root ST canal sealer and Reciproc R25 gutta-percha, based on the single-cone technique. A 2-mm section was extracted from the middle part of the roots to test for POBS. Values were recorded in MPa and fracture types were examined. Groups were compared using one-way ANOVA (Welch’s) test.

Results: The GA, EDTA, and IP6 groups showed no significant intergroup differences (p > 0.05). EDTA and GA groups had significantly higher POBS than the DW group (p < 0.05). No significant difference was observed between IP6 and DW groups (p > 0.05).

Conclusion: GA increased the bond strength of the bioceramic-based canal sealer to the root canal dentin at least as much as EDTA; IP6 exhibited similar strength to these chelators, it was not better than DW.