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ORIGINAL ARTICLE
Year : 2020  |  Volume : 17  |  Issue : 2  |  Page : 60-63

Influence of antioxidant agents on shear bond strength of composite resin to the bleached human enamel: an in-vitro study


Department of Operative Dentistry, Al-Azhar University (Assiut Branch), Assiut, Egypt

Correspondence Address:
Ahmed A. Abd El-Ghany Abd El-Aal
Lecturer of Operative Dentistry, Al-Azhar University (Assiut Branch) Assiut
Egypt
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/tdj.tdj_38_19

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Background Composite restoration success and longevity after bleaching are mainly affected by bond strength which is severely decreased. Many studies have found that bond strength postbleaching is clearly reduced and suggested that bonding procedure should be delayed by a periods varying from 1 day to 3 weeks. Other studies have recorded that antioxidants can increase the bonding strength of composite resin to recently bleached enamel. Aim To estimate the effect of different antioxidants on shear bond strength of composite resin to bleached human enamel. Materials and methods A total 50 maxillary human central incisors were used in the study and classified into five groups as follow; group 1: unbleached (control group) bonding procedure performed without bleaching. Group 2: a carbamide peroxide 35% of bleaching gel followed by immediate composite bonding. Group 3: 35% of carbamide peroxide bleaching agent followed by delayed bonding procedure 3 weeks later. Group 4: 35% of carbamide peroxide bleaching agent followed by application of 10% of sodium ascorbate. Group 5: 35% of carbamide peroxide bleaching agent leaf extract of Aloe Vera (an antioxidant), for 10 min. Results Group 1 recorded the highest mean shear strength value (16.34602 ± 2.6402), while the least mean shear value was recorded for group 2 (9.971 ± 0.6837). Group 3 registered mean shear strength value 12.959 ± 2.279, group 4 recorded mean shear strength value 11.7691 ± 2.0984, and group 5 recorded mean shear strength value 13.8939 ± 2.6837 Mpa. Conclusion The leaf extract of Aloe Vera as 10% sodium ascorbate for 10 min could reverse the side effect of the bleaching agent, and enable practitioners to perform bonding procedures without delay.


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