EVALUATION OF PUSH-OUT BOND STRENGTH OF GLASS FIBER POSTS USING DIFFERENT LUTING CEMENTS

Objective:To evaluate the push-out bond strength of glass fiber posts (GFPs) luted with three different materials—bulkfill resin composite, resin-modified glass ionomer cement (RMGIC), and self-adhesive resin cement—across various root canal regions. Materials and Methods:Thirty extracted human mandibular premolars were decoronated and endodontically treated. Specimens were divided into three groups based on the luting agent (n = 10). After post cementation, the roots were transversely sectioned into coronal, middle, and apical thirds. Tukey's post hoc test (p < 0.05) and two-way ANOVA were used to examine the results after push-out bond strength was determined using a universal testing machine. Results:Bond strength was strongly impacted by the type of luting agent and the root canal area (p < 0.001). The highest mean bond strength was found in the apical third luted with bulk-fill resin (27.20 ± 1.20 N), while the middle third luted with self-adhesive resin exhibited the lowest (8.16 ± 1.20 N). Conclusion:Bulk-fill resin composite demonstrated superior bonding performance across all root levels. The interaction between anatomical location and luting agent should be carefully considered in clinical post-endodontic restorations.