Effect of exposure to root canal irrigants on the push-out bond strength of calcium silicate–based cements

Objectives The aim of this study was to compare the push-out bond strength (POBS) of three calcium silicate–based cements (CSBC) after exposure to saline, sodium hypochlorite (NaOCl), ethylenediaminetetraacetic acid (EDTA), and a mixture of NaOCl and etidronic acid (NaOCl+HEBP) in simulated perforation. Materials and methods A total of 180 dentin slices were perforated and then filled with either Biodentine (BD), ProRoot MTA (PMTA), or Total Fill (TF). After 1 week, specimens in each group were divided into 4 subgroups ( n = 15) according to the root canal irrigant (RCI) that their coronal surface was exposed to: saline, 5.25% NaOCl, 17% EDTA, or a mixture of 5.25% NaOCl and 9% HEBP (NaOCl+HEBP). A push-out test was performed, and the failure pattern was assessed. POBS data were analyzed with ANOVA and Tukey post hoc tests and the failure patterns with chi-square test. Results No differences were found when comparing the effect of RCI on the POBS of PMTA. BD showed significantly higher POBS values after exposure to NaOCl+HEBP ( p < .05), and those of TF were significantly lower after exposure to EDTA ( p < .05). No differences in the failure patterns were found among groups. Conclusion NaOCl+HEBP had no detrimental effect on the POBS of CSBC. Clinical relevance The mixture of sodium hypochlorite and etidronic acid may be considered as an alternative irrigant when treating root perforations.