In vitro Evaluation of Effect of Dental Bleaching on the Shear Bond Strength of Sapphire Orthodontics Brackets Bonded with Resin Modifed Glass Ionomer Cement
Journal Title: International Journal of Medical Research & Health Sciences (IJMRHS) - Year 2017, Vol 6, Issue 11
Abstract
Aim: This study aimed to assess the effect of various types of bleaching agents on the shear bond strength of sapphire brackets bonded to human maxillary premolar teeth using resin modifed glass ionomer cement (RMGIC) and to determine the site of bond failure. Materials and Methods: Thirty freshly extracted maxillary human premolars were selected and assigned into three equal groups, ten teeth in each. The frst group was the control (unbleached) group; the second group comprised teeth bleached with hydrogen peroxide group (HP) 37.5% (in-offce bleaching) while the third group included teeth bleached with carbamide peroxide group (CP) 16% (at-home bleaching). The teeth in the experimental groups were bleached and stored in water one day then bonded with sapphire brackets using RMGIC with the control group and left another day. De-bonding was performed using Instron universal testing machine. To determine the site of bond failure, both the enamel surface and bracket base of each tooth were examined under magnifying lens (20X) of a stereomicroscope. Results: Results showed statistically highly signifcant difference in the shear bond strengths between control group and both of bleaching groups being low in the control group. Score III was the predominant site of bond failure in all groups. Conclusions: RMGIC provides adequate bond strength when bonding the sapphire brackets to bleached enamel; this bonding was strong enough to resist both the mechanical and masticatory forces. Most of the adhesive remained on the brackets, so it reduced the time required for removal of the bonding material’s remnants during enamel fnishing and polishing.
Authors and Affiliations
Zainab M Kadhom| Assistant Lecturer, Department of Orthodontics, College of Dentistry, University of Baghdad, Iraq, Harraa S Mohammed-Salih| Lecturer, Department of Orthodontics, College of Dentistry, University of Baghdad, Iraq, Mohammed Nahidh| Assistant Professor, Department of Orthodontics, College of Dentistry, University of Baghdad, Iraq, Corresponding e-mail: m_nahidh79@yahoo.com
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