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

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.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.One-way analysis (ANNOVA). Pairwise comparison of groups was done with post hoc test.Biomodification of deep dentin with PA showed the highest shear bond strength followed by riboflavin and control group.Biomodification of dentin surface with collagen cross-linking agents results in improvement of bond strength of total-etch adhesive to deep dentin.