<b>Enhancing tensile bond strength of glass fiber posts using chitosan as a coupling agent: A novel approach for improved dental restorations</b>

Objective: This study was designed to assess the effectiveness of chitosan as a coupling agent for improving the tensile bond strength of fiber posts. Material and Methods: 91 single-rooted mandibular teeth were root canal filled. Post spaces were created and categorized into seven groups: Group A (Control), Group B (Silane), Group C (Chitosan), Group D (37% Phosphoric acid + Silane), Group E (37% Phosphoric acid + Chitosan), Group F (10% Hydrogen Peroxide + Silane), and Group G (10% Hydrogen Peroxide + Chitosan). Posts were cemented and tensile bond strength was measured, while the morphological structure of the fiber posts was analyzed using Scanning Electron Microscopy. One-way (ANOVA) and Tukey multiple comparison tests were performed at a level of significance of 5%. The percentages of fracture pattern among the groups were compared. Results: 10% Hydrogen peroxide + Chitosan exhibited the significantly highest tensile bond strength (P&lt;.001). Adhesive failures were more frequent in Groups A, B, C, and D respectively. whereas cohesive failures within the resin cement were predominant in Groups E, F, and G. respectively. Conclusions: 10% hydrogen peroxide and chitosan coupling agent significantly improved tensile bond strengths for glass fiber posts. Clinical Significance: The need for the proper selection of an effective surface treatment for glass fiber posts to optimize adhesion to resin material used.