Year : 2024

Volume : Volume 16

Issue : Issue 5

Address for correspondence :
Dr. Akhil Karamshetty
drakhilkaramshetty@gmail.com

Abstract

Objective: The objective of this study was to assess the impact of different concentrations of carbamide peroxide bleaching agents on the shear bond strength (SBS) of ceramic orthodontic brackets bonded to human premolar teeth. Materials and Methods: Forty-five extracted sound human premolars were randomly assigned into three groups (n = 15 each) based on bleaching protocol: Group A – unbleached control; Group B – bleached with 16% carbamide peroxide; and Group C – bleached with 35% carbamide peroxide. Ceramic brackets were bonded to all specimens using a standardized bonding procedure. SBS was measured using a universal testing machine. Data were analyzed using one-way analysis of variance and post hoc Tukey tests. Results: The highest mean SBS was observed in Group A (111.20 ± 11.42 MPa), followed by Group B (85.40 ± 5.73 MPa), and the lowest in Group C (41.88 ± 13.10 MPa). The differences among all groups were statistically significant (P = 0.001), indicating a marked decline in bond strength with increasing bleaching concentration. Conclusion: Bleaching with carbamide peroxide significantly reduces the SBS of ceramic brackets. The reduction is more pronounced at higher bleaching concentrations. It is recommended that clinicians consider the timing and concentration of bleaching agents before bracket bonding to ensure optimal adhesion. Keywords: Bleaching, Carbamide peroxide, Ceramic brackets, Enamel bonding, Orthodontics, Shear bond strength.