Push-Out Bond Strength of Resin-Modified Glass Ionomer Cement and Flowable Composite Luting Systems on Glass Fiber Post of Root Canal

Abstract

Background: Posts that have been properly fitted can withstand torsion forces and so provide better retention. 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). Method: Forty single-rooted maxillary central incisors were used in the study. The samples were randomly divided into two groups of 20 teeth each. The crown-down procedure was used to clean and shape the pulp area. A Tenax fiber trans Coltene whaletene post was used by both groups. The first group utilized FC (Filtek Z 350 3M ESPE) to coat the post, whereas the second group used RMGIC (Rely X 3M ESPE). The specimens were cross-sectioned after 24 h. Specimens were cross-sectioned four millimeters thick into coronal and middle parts using a sectioning machine, yielding 40 specimens per group. 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 4.80 N push-out bond strength, whereas the RMGIC group had a 7.11 N push-out bond strength. Conclusion: FC’s mean push-out bond strength score is lower than RMGIC’s.

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

“…This may be due to the light cure of the cement In the first group, which does not allow cure of the deep parts of It inside the root canal, which are difficult for light to reach, and thus the weakness of the bond strength with the post, while the type of cure in the second group was dual cure, that Is, it begins with the induction of light and the reaction continues chemically, which allows cure reaction to be completed for the deep parts that light cannot reach. The results of this study agreed with Cheruvathoor 2021 [21].…”

“…The thin-slice push-out test allowed for a more uniformed stress distribution along with the bonded interface. The test was performed at a speed of 0.5 mm/min until the post separated from the root dentin, which is the speed used in many similar studies examining the retention of the Glass fiber posts within the root canal [21].…”

Influence of Conventional Polymer, Hybrid Polymer and Zinc Phosphate Luting Agents on the Bond Strength of Customized Zirconia Post in Premolars—An In-Vitro Evaluation

“…This is supported by the fact that phosphoric acid within zinc phosphate cement increases the roughness and wettability of apical root dentin, allowing for improved micromechanical retention and bonding [27]. Modified polymer RMGIC on the other hand produces chemical adhesion of a mechanically strong hybrid resin and micromechanical bonding due to the formation of resin tags with the smear layer and root dentin [29].…”