Comparative Study of Bond Strength of Resin-Modified Glass Ionomer Cement and Flowable Composite with Glass Fiber Posts by Push-Out Test

Introduction: posts that have been properly fitted can withstand torsion and provide better retention. The purpose of this study was to evaluate the push-out bond strength of glass fiber posts cemented with different luting agents. The push-out bonding strength of glass fiber posts to the root canal was evaluated using resin-modified glass ionomer cement (RMGIC) and flowable composite (FC). Materials and Methods: Thirty single-rooted extracted human mandibular premolars were sectioned 2 mm coronal to the most incisal point of the cementoenamel junction. Root canals were instrumented and obturated with laterally condensed gutta-percha and root canal sealer (ADSEAL). Gutta-percha was removed from the canals to a depth of 11 mm and diameter post spaces with a 1.5 mm were prepared. The specimens were divided into the following 3 groups according to the luting agent used (n=10). The first group utilized FC (HARVARD, Germany) to coat the post, whereas the second group used RMGIC (Meron plus QM, VOCO, Germany). whereas the third group used Resin Cement (ITENA clinical, France) was used as the control. The specimens were cross-sectioned after 24 h. Specimens were cross-sectioned six millimeters thick into coronal using a sectioning machine. The strength of the bond between the luting cement and the posts was measured using push-out bond strength testing. We loaded the components at a cross speed of 0.5 mm/min on a universal testing machine until the bond failed. Results: The FC group had a 73.53N push-out bond strength, whereas the RMGIC group had a 133.55N, whereas the Resin Cement group had a 137.47N push-out bond strength. Conclusion: FC’s mean push-out bond strength score is lower than RMGIC’s and Resin Cement.