Effect of different chelating agents on the bond strength of a silicone-based root canal sealer to root dentin

AIM: The purpose of this study was to evaluate the impact of 7% maleic acid (MA), 17% ethylenediaminetetraacetic acid (EDTA) solution, 10% citric acid (CA), or 2.25% peracetic acid (PAA) on the dislodgment resistance of a silicone-based root canal sealer. MATERIALS AND METHODS: Ninety-five mandibular incisors were shaped to size R50. The specimens were randomly assigned to the following five groups (n = 15) based on the final irrigation solution: 5% sodium hypochlorite (NaOCl), 17% EDTA, 7% MA, 10% CA, and 2.25% PAA. Four specimens from each group were examined under scanning electron microscope. All the remaining canals were obturated with GuttaFlow(®) Bioseal. Bond strength was assessed using the push-out test. The data were analyzed statistically by two-way analysis of variance and Bonferroni tests at the significance level of P = 0.05. RESULTS: The roots irrigated with chelators showed statistically significantly higher bond strength than the roots irrigated with NaOCl (P < 0.05). Overall, MA showed the highest bond strength, but there was no statistically significant difference among the other chelating solutions (P > 0.05). CONCLUSIONS: The bond strength of the GuttaFlow Bioseal to the root canal dentin may increase by the removal of smear layer. Final irrigation with the investigated chelators resulted in similar bond strength of the GuttaFlow Bioseal.