(PR165) Dentin-Sealer Bond Strength. A Review: An In-Vitro Comparison Between GuttaFlow 2 ®, EndoSequence BC High Flow ®, Tubli-Seal ®, Sealapex ®, and AH Plus Jet ® Sealers

Introduction: The goal of non-surgical endodontic therapy is to create a hermetic seal in the root canal to prevent bacterial entry. Research has highlighted bioceramic sealers as ideal due to their low shrinkage, reduced toxicity, and strong bond to dentin. GuttaFlow2^®, a new calcium silicate sealer with gutta-percha particles, is reported by its manufacturer, to offer a tight seal through expansion and adhesion. While GuttaFlow2 has been compared to the resin-based sealer AH Plus Jet in leakage studies, its shrinkage and bond strength have not yet been compared to zinc oxide eugenol sealers or bioceramic sealers.

Methods: 100 extracted human premolars were sectioned into 2 mm thick dentin slices with a standardized canal space of 1.5 mm. These samples were mounted on epoxy resin blocks and divided into five groups based on the sealer used: GuttaFlow2, AH Plus Jet, Tubli-Seal, EndoSequence BC High Flow, and Sealapex. Push-out bond strength was measured using a universal testing machine with a custom 1.5 mm plunger applying pressure at 0.5 mm/min. The bond strength and failure patterns were recorded, with failure inspected under a microscope. The data were analyzed using a linear mixed-effects model, with statistical significance set at p<0.05.

Results: The push-out bond strength results, from highest to lowest, are: AH Plus Jet (45.45 MPa), EndoSequence BC High Flow (26.55 MPa), Tubli-Seal (12.39 MPa), and GuttaFlow2 (9.57 MPa). Sealapex was excluded from analysis due to material inconsistency.

Conclusion: In the context of this in-vitro research, there was great variation in push-out bond strengths of the sealers tested.