Objective: The aim of this paper was to evaluate the effects of four final irrigation solutions, on bond strength to radicular dentin of three root canal sealers based on calcium silicate and resin.
Methods: This study used 96 extracted mandibular premolars. The teeth were sectioned transversally to obtain two sections. The resulting 192 samples were randomly divided into four irrigation groups: Group 1 was irrigated with 17% EDTA and 5.25% NaOCl; Group 2 with QMix; Group 3 with 0.2% chitosan solution; and Group 4 with distilled water. After these irrigation procedures, three specimens from each group were randomly chosen for SEM examination. Then, remaining teeth were randomly divided into three subgroups (n=15), according to the sealer used: AH Plus, MTA Fillapex, and Total Fill BC Sealer. A vertical load was applied using a universal testing machine. All statistical analyses were performed with the SPSS (ver. 20.0) software. The results were analysed with a One-Way Analysis of Variance (ANOVA) and a post-hoc Tukey’s test (p ≤ 0.05).
Results: AH Plus and Total Fill BC Sealer provided equal bond strengths to the root canal wall in all the groups except the distilled water group (p<0.05). MTA Fillapex showed lower bond strength values than those of either AH Plus or Total Fill BC (p>0.05). When chitosan was used, all root canal sealers showed their highest bond strength values.
Conclusions: Chitosan may serve as an alternative chelating agent for use with various root canal sealers.