Does sodium ascorbate improve bond strength after dental bleaching techniques

Objective: To summarize and discuss the available information concerning the effectiveness of sodium ascorbate in improving bond strength after dental bleaching procedures. Methods: Information of original articles or reviews listed in PubMed database using searching terms: (“sodium ascorbate” OR antioxidant) AND (bleaching OR hydrogen peroxide OR carbamide peroxide), were included in the review.  Results: Most of studies revealed that sodium ascorbate could restore the altered redox potential of the oxidized bonding substrate, thus reversing the compromised bonding. However, several protocols of this antioxidant have been used in combination with different peroxide concentrations and exposure time to bleaching agents. Conclusion: Studies should be conducted to establish an appropriate application protocol and to evaluate the effect of sodium ascorbate in other dental properties.