Effect of the endodontic sealer on the bond strength of glass fiber posts.

This study aimed to evaluate the influence of 2 endodontic sealers on the bond strength between glass fiber posts and root canal dentin at different storage times (7 days or artificial aging), also considering the root canal region (cervical, middle, and apical). A total of 60 extracted single-rooted human teeth were divided randomly into 4 groups (n = 15) according to endodontic sealer (bioceramic sealer vs epoxy resin-based sealer) and storage time prior to cementation (7 days or artificial aging via thermocycling). Following root canal treatment and cementation of glass fiber posts, all groups were stored in distilled water for 7 days at 37°C. The bioceramic and epoxy resin sealer groups designated for artificial aging were then subjected to 10,000 thermocycles in a water bath alternating between 5°C and 55°C, with a dwell time of 30 seconds at each temperature. The roots were sectioned transversely, and a single slice (approximately 2 mm thick) per post/canal third was obtained and submitted to a push-out test in a universal testing machine at a speed of 5 mm/min. Data were analyzed using 3-way analysis of variance (α = 0.05). There was no statistically significant difference in the bond strength between the sealer groups (P = 0.619), regardless of the storage time (P = 0.933). Likewise, no significant differences were observed among the root canal thirds--cervical, middle, or apical (P = 0.665). In this in vitro study, none of the tested variables--type of sealer used (epoxy resin-based or bioceramic), storage time prior to cementation, or root canal third (cervical, middle, or apical)-- affected the bond strength of glass fiber posts.