Effect of different irrigation solutions on the push-out bond strength of bioceramic and resin-based root canal sealers: An in vitro study

Sažetak

Background: The aim of this study was to compare the effect of continuous chelation using Dual Rinse hydroxyethylidene diphosphonate (HEDP) as a single irrigant with 17% ethylenediaminetetraacetic acid (EDTA) and 0.2% chitosan on the push-out bond strength of AH Plus and Bio-C root canal sealers to root dentin. Materials and Methods: One hundred twenty single-rooted mandibular premolars were standardized to 17 mm and randomly assigned to three irrigation groups and six sealer subgroups (EDTA-AH Plus/Bio-C; HEDP-AH Plus/Bio-C; chitosan-AH Plus/Bio-C). Root canals were prepared with a reciprocating NiTi system. Final irrigants were ultrasonically activated for 1 min. Obturation was performed with AH Plus or Bio-C using cold lateral compaction. After storage (37 °C, 100% humidity, 1 week), 1 ± 0.1 mm slices were obtained from apical, middle, and coronal thirds. Push-out testing was performed at 1 mm/min. Failure modes were examined under a stereomicroscope. Data were analyzed using parametric or nonparametric tests (p < 0.05). Results: AH Plus demonstrated significantly higher bond strength than Bio-C (p = 0.041). No significant difference was found among irrigation protocols when sealer type was disregarded (p = 0.086). Cohesive failure predominated (69.2%), and failure mode distribution differed significantly among groups (p < 0.001). Conclusions: Continuous chelation using Dual Rinse HEDP as a single irrigant demonstrated similar push-out bond strength compared with 17% EDTA and 0.2% chitosan. This approach may serve as an alternative to conventional multi-step protocols by potentially reducing clinical chair time and simplifying treatment steps.