Effect of proanthocyanidin and riboflavin on shear bond strength of a nanocomposite to deep dentin – An in vitro Study

AIMS: The objective of this study was to evaluate the effect of two collagen crosslinking agents on shear bond strength of a nanocomposite using total-etch adhesive to deep dentin. MATERIALS AND METHODS: Thirty maxillary central incisors were selected for the study and each tooth was divided into two equal halves with diamond disc (n = 60). Proximal surfaces were prepared to expose the deep dentin until the remaining dentin thickness was approximately 1 mm. The specimens were divided into three groups based upon the biomodification of dentin with collagen crosslinking agents. In Group I (n = 20), no collagen crosslinking agent was used before bonding system. In Group II, deep dentin biomodification was done with 6.5% proanthocyanidin (PA). In Group III, deep dentin biomodification was done with Riboflavin. Shear bond strength was evaluated using universal testing machine. STATISTICAL ANALYSIS USED: One-way analysis (ANNOVA). Pairwise comparison of groups was done with post hoc test. RESULTS: Biomodification of deep dentin with PA showed the highest shear bond strength followed by riboflavin and control group. CONCLUSION: Biomodification of dentin surface with collagen cross-linking agents results in improvement of bond strength of total-etch adhesive to deep dentin.