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Year : 2015  |  Volume : 3  |  Issue : 2  |  Page : 96-100

Shear bond strength of orthodontic brackets after antioxidant treatment on previously bleached teeth: An in vitro study

Department of Orthodontics and Dentofacial Orthopaedics, A.B. Shetty Memorial Institute of Dental Sciences, Mangalore, Karnataka, India

Correspondence Address:
Aneeshv Katyal
Department of Orthodontics and Dentofacial Orthopaedics, A.B. Shetty Memorial Institute of Dental Sciences, 5th Floor, Deralakatte, Mangalore - 575 018, Karnataka
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2321-3825.146363

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Context: Bleaching of the enamel surface reduces shear bond strength. This can be reversed by use of antioxidants prior to bonding of brackets. Aims: The aim of the study was to verify and validate the improvement in bond strength through the application of antioxidant on previously bleached teeth. Materials and Methods: Thirty-six sound maxillary and mandibular premolars extracted for orthodontic purposes were collected and divided into three groups of 12. Specimens in Group 1 were bleached with 35% hydrogen peroxide as a bleaching agent. Specimens in Group 2 were bleached and subsequently treated with 10% antioxidant (sodium ascorbate). Specimens in Group 3 served as a control. All specimens were stored in artificial saliva for 24 h prior to the bonding of orthodontic brackets. After bracket attachment, the samples were stored in distilled water for 1-week and then tested for shear bond strength using an INSTRON testing machine. Results: The data revealed that there was a significant difference between shear bond strengths of the bleached group; bleached + antioxidant group and the control group. Group 2 showed greater bond strength compared with Group 1, but lesser than the bond strength of the control group. Conclusion: The results confirmed the positive effect of antioxidant treatment on the bond strength of orthodontic brackets after tooth bleaching.

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