Comparative Evaluation Of The Effect Of Sodium Ascorbate And Proanthocyanidin On Shear Bond Strength Of Composite Resin To Deep Dentin: An In Vitro Study

Aims & Background:Comparative evaluation of the effect of Sodium ascorbate and Proanthocyanidinon shear bond strength of composite resin to deep dentin.Materials and Methods:15 permanent anterior teeth were selected for the study and each tooth was divided into two equal halves i.e. mesial and distal (n = 30). Proximal surfaces were prepared to expose the deep dentin until the remaining dentin thickness was approximately 1 mm. The specimens were divided into 3 groups (n = 10), based upon the biomodification of dentin with collagen crosslinking agents: Group A (Control –No surface pretreatment), Group B (Sodium ascorbate), Group C (Proanthocyanidin). Etching was done on the prepared proximal dentinal walls for 15 s followed by pretreatment with collagen cross linking agents. Universal adhesive was applied on the treated surface for 20 s and light cured for 10 s followed by build-up with nanocomposite using a matrix prepared in the form of tube with 3mm diameter.Shear bond strength between deep dentin & nanocomposite was evaluated after incubation and thermocycling using a Universal Testing Machine. The statistical analysis was performed using One-way ANOVAand Post Hoc Tukey’s Test using SPSS software Version 21.0.Results:The highest mean shear bond strength was noticed in Group C (Proanthocyanidin), followed by Group B (Sodium ascorbate) and then Group A (Control). Statistically significant differences in shear bond strength were noted, with control group being the least effective.Conclusion:Biomodification of dentin surface with collagen cross‑linking agents results in improvement of bond strength of adhesive to deep dentin, with 6.5% Proanthocyanidin showing the most significant improvement.Clinical significance:The modification of the dentin surface with collagen cross‑linking agents has the potential to improve clinical performance of the resin-based restoration.