Marginal sealing and bond strength of perforated roots treated with mta, different irrigants and fiber post

This study evaluated the influence of root perforation repair using Mineral Trioxide Aggregate (MTA) on the bond strength of glass fiber posts luted to intraradicular dentin, considering the effects of different chemical irrigants and failure modes. Eighty bovine incisor roots were divided into groups based on: (1) type of chemical irrigant (distilled water, 17% EDTA solution, 2% chlorhexidine digluconate solution, or 2% sodium hypochlorite solution); and (2) presence or absence of MTA-repaired root perforations. Following endodontic treatment, artificial root perforations were created in half of the specimens at the coronal, middle, and apical thirds and subsequently repaired with MTA. Root canals were prepared and irrigated with the assigned solution prior to cementation of glass fiber posts (Reforpost #3, Angelus) using self-adhesive resin cement (RelyX U200, 3M ESPE). Specimens were then subjected to a push-out bond strength test. No significant difference in bond strength was found between the perforated groups repaired with MTA and the unperforated groups, regardless of the irrigant used or root third (p = 0.802). The predominant failure mode was adhesive between the cement and dentin. Kruskal–Wallis and Friedman tests showed that neither the irrigant solution nor the root third significantly affected marginal sealing (p > 0.05). These results suggest that MTA repair of root perforations does not compromise post retention, irrespective of the irrigant type or location within the root.