142TO EVALUATE EFFECT OF 10% SODIUM ASCORBATE SOLUTION AND10% Α-TOCOPHEROL SOLUTION ON SHEAR BOND STRENGTH WHEN BONDING IS PERFORMED AFTER BLEACHING WITH HYDROGEN PEROXIDE GELTo evaluate effects of 10% Sodium ascorbate solution and 10% α-tocopherol solution on shear bond strength of etch and rinse adhesive system to enamel when bonding is performed after tooth bleaching with 38 % hydrogen peroxide gel. Study was performed on freshly extracted eighty human maxillary incisors. Labial enamel surfaces of sixty specimens were bleached with 38% Hydrogen peroxide bleaching gel. Bleaching gel was completely rinsed off with water. Specimens were randomly divided into three groups of twenty teeth depending upon Redox-active compound used. Twenty teeth served as the Control and did not receive any bleaching treatment. GROUP A (n=20)No bleaching treatment, only composite restoration. GROUP B( n=20)Bleaching with 38% Hydrogen peroxide gel and composite restoration. GROUP C (n=20)Bleaching with 38% Hydrogen peroxide gel followed by application of 10% Ascorbate solution and composite restoration. GROUP D (n=20)Bleaching with 38% Hydrogen peroxide gel followed by application of α-tocopherol 10% solution and composite restoration. All specimens were mounted in Universal testing machine and then tested for shear bond strength. Values were subjected to statistical analysis using ANOVA for multiple group comparisons of shear bond strength followed by Tukey‟s post-hoc test for group wise comparison. Significant difference between mean scores of Shear Bond Strength Value were tested with respect to four groups using statistics of Analysis of variance test after verifying assumption by Q-Q Plot technique andwas observed that that mean Shear Bond Strength score of Group D was almost statistically equal to the mean Shear Bond Strength score of Group A The Shear Bond Strength scores of Group Bis the least. It was concluded that application of 10% alpha-tocopherol in treatment of bleached enamel surface, reversed compromised bond strength and can be better alternative to delayed bonding.drranjuraghu@gmail.comResearch622016Sodium ascorbate solution, α-tocopherol solution,Shear bond strength,Tooth BleachingAkshay Mohan,Yadav Chakravarthy,Ranju RaghuDepartment of Endodontics, Vinayaka Mission Sankarachariyar Dental College, Salem, Tamil Nadu, India,Department of Endodontics, Vinayaka Mission Sankarachariyar Dental College, Salem, Tamil Nadu, India,Department of Endodontics, Vinayaka Mission Sankarachariyar Dental College, Salem, Tamil Nadu, India