Effect of endodontic chelating solutions on the bond strength of endodontic sealers

The purpose of this in vitro study was to evaluate the effectof various chelating solutions on the radicular push-out bond strengthof calcium silicate-based and resin-based root canal sealers. Root canalsof freshly-extracted single-rooted teeth (n = 80) were instrumentedby using rotary instruments. The specimens were randomly dividedinto 4 groups according to the chelating solutions being tested: (1) 17%ethylenediaminetetraacetic acid (EDTA); (2) 9% etidronic acid; (3) 1%peracetic acid (PAA); and (4) distilled water (control). In each group,the roots were further assigned into 2 subgroups according to thesealer used: (1) an epoxy resin-based sealer (AH Plus) and (2) a calciumsilicate-based sealer (iRoot SP). Four 1 mm-thick sections were obtainedfrom the coronal aspect of each root (n = 40 slices/group). Push-outbond strength test was performed at a crosshead speed of 1 mm/min.,and the bond strength data were analyzed statistically with two-wayanalysis of variance (ANOVA) with Bonferroni’s post hoc test (p < 0.05).Failure modes were assessed quantitatively under a stereomicroscope.Irrespective of the irrigation regimens, iRoot SP exhibited significantlyhigher push-out bond strength values than AH Plus (p < 0.05). For boththe sealers, the use of chelating solutions increased the bond strength,but to levels that were not significantly greater than their respectivecontrols (p > 0.05). iRoot SP showed higher resistance to dislocationthan AH Plus. Final irrigation with 17% EDTA, 9% Etidronic acid, and1% PAA did not improve the bond strength of AH Plus and iRoot SP toradicular dentin.