Evaluation of the Effect of Various Antioxidants on the Shear Bond Strength of the Composite Resin to the Bleached Enamel: An In Vitro study

Abstract Objective Various intrinsic and extrinsic stains cause discolored teeth, which is of great concern to patients, can be treated by bleaching, enamel microabrasion, veneers, crowns. However, bleaching leads reduced bond strength if adhesive restorations are performed immediately. Thus, the application antioxidant agents after has been recommended, proved act as free radical scavengers, improving strength. Materials Methods A total 120 extracted human maxillary incisor teeth were taken. Using a slow-speed diamond saw water coolant spray, roots all removed approximately 2 mm below cementoenamel junction. With labial surface facing upward, each sectioned sample was embedded in acrylic resin. Then, central portion tooth ground flattened with 600-grit silicon carbide paper such that becomes smooth evenly flat. All samples divided into two control groups (n = 20), i.e., positive group 10) negative five experimental 100), had 20 samples. The both antioxidants thoroughly rinsed off distilled for 30 seconds subjected bonding procedure. Result Significant differences observed among (p < 0.05). 10% sodium ascorbate (group III) demonstrated significantly higher mean shear than other