Enhanced Bond Strength and Adhesive Interface of Resin-Based Sealer to Root Dentin Using a Novel Single Multifunctional Endodontic Irrigant Solution

This study aimed to evaluate the influence of a new multifunctional single endodontic irrigant on the push-out bond strength and adhesive interface between gutta-percha and an epoxy resin-based sealer and root dentin. Forty-eight human maxillary canines were randomly assigned to four irrigation protocols (n = 12): NaOCl 2.5% + EDTA 17% + saline (SHE), Triton solution + saline (T), Triton solution + EDTA 17% + saline (TE) and NaOCl 2.5% + Triton solution + saline (SHT). Root canals were prepared with the WaveOne Gold Large system and obturated using a single WaveOne Large cone with AH Plus sealer. The SHE group showed the highest bond strength (4.87 ± 0.84 MPa), significantly higher than those of the other groups (p < 0.001). Scanning Electron Microscopy (SEM) revealed better adaptation in SHE, whereas T, TE and SHT exhibited gaps. The new irrigant resulted in lower bond strength and poorer adaptation of the adhesive interface.