Assessment of push-out bond strength of post-surface pretreatment before salinization using hydrogen peroxide, aluminum trioxide, and natural photosensitizers to radicular dentin

Abstract

Objective: The study aimed to evaluate the effect of different post surface pretreatment methods i.e., 24% hydrogen peroxide (H₂O₂), riboflavin photosensitizer (RFP), curcumin photosensitizer (CP) and aluminum oxide (Al₂O₃), and silane only on the bond values of glass fiber post to resin cement MATERIALS AND METHODS: Fifty single-rooted human teeth were obtained and crowns were sectioned coronally to the cementoenamel junction (CEJ). Protaper universal file system was used for canal cleaning and shaping followed by obturation. Post space was prepared and all the posts were then randomly divided into five groups depending on the surface pretreatment used (n = 10). Group 1: 24% H₂O₂ + silane, Group 2: RFP + silane, Group 3: CP + silane, Group 4: Al₂O₃ + silane, Group 5: silane only. Post-surface treatment was followed by post-placement using a self-etch dual-cure cement Panavia F 2.0. Acrylic blocks were used to hold the specimens perpendicularly and all the samples were sectioned by slow-speed saw into coronal, middle, and apical third. The universal testing machine determines pushout bond strength and failure mode was analyzed by stereomicroscope. One-way analysis of variance (ANOVA) and Tukey multiple comparison tests were used to analyze data.

Result: The coronal section of group 4 (Al₂O₃ + silane) displayed the highest PBS (8.23±0.14 MPa). Whereas, an apical third of group 2 (RFP + silane) exhibited the lowest PBS (2.02±0.12 MPa). PBS values in samples in group 1 surface treated with 24% H₂O₂ + silane displayed comparable outcomes to samples in group 4 at all three levels (p>0.05). Samples in group 2 (RFP + silane) group 3 (CP + silane) and group 5 (Silane Only) demonstrated comparable PBS (p>0.05).

Conclusion: Glass fiber reinforced post-surface pretreatment method using hydrogen peroxide and aluminum trioxide along with silane improves push-out bond strength at all three levels (coronal, middle, and apical). The use of a silane coupling agent on glass fiber posts alone does not improve bond values. The practice of photosensitizer on post-surface needs to be investigated further.

Keywords: Aluminum trioxide; Curcumin photosensitizer; Glass fiber post; Hydrogen peroxide; Photodynamic Therapy; Post pretreatment; Riboflavin photosensitizer.