Background: The action of sodium hypochlorite is to form an oxidative layer in radicular dentin. Antioxidant not only removes the oxygen species but also increase the bond strength of sealer. Aim: To compare and evaluate the push out bond strength of resin-based sealer to the radicular dentin treated with antioxidants and diode laser to decrease oxidizing effect of sodium hypochlorite. Methods: Sixty single rooted permanent teeth were selected and decoronated. All the teeth were prepared with ProTaper Universal rotary system up to F3 and canals were irrigated using 3 mL of 5.25% sodium hypochlorite during instrumentation. The canals were flushed with normal saline as a final irrigating solution. Then samples were treated with antioxidants and diode laser according to following group: Group I – Cocoa bean extract (CBE), Group II – 10% Sodium ascorbate, Group III – 1.5W Diode laser, Group IV – 5ml Saline. All samples were obturated with Gutta percha and AH Plus sealer. Samples were sectioned to obtaining disc thickness of 2mm. Push out bond strength was performed using universal testing machine. The data was analysed using one way ANOVA and post hoc Tukey test. Results: Cocoa bean extract and Diode laser showed significantly higher bond strength values compared to control group (P < 0.05) even so, sodium ascorbate showed equivalent bond strength. Adhesive failures were predominant in all groups. Conclusion: cocoa bean extract as an herbal antioxidant can give better treatment outcome when treated with resin based sealer.
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