Bond strength of metallic brackets after dental bleaching.
OBJECTIVE
To test the hypothesis that there is no difference between the action of at-home and in-office vital bleaching on the shear bond strength of metallic brackets bonded with composite resin 24 hours after bleaching.


METHODS
Forty-five human upper premolars were randomly divided into three groups: (1) control, (2) 10% carbamide peroxide at-home bleached, and (3) 35% hydrogen peroxide in-office bleached. Twenty-four hours after bleaching the teeth were pumiced, bonded with metallic brackets, and stored in distilled water. One day after bonding the shear bond strength of the brackets was determined.


RESULTS
The mean shear bond strength of Group 1 (control) and Group 2 (carbamide peroxide bleached) were not statistically different. Group 3 (hydrogen peroxide bleached) had a significantly lower mean shear bond strength than Group 1 and Group 2.


CONCLUSIONS
The hypothesis is rejected. Use of 10% carbamide peroxide bleaching does not significantly alter shear bond strength values. On the other hand, use of 35% hydrogen peroxide bleaching significantly reduces these values and diminishes the amount of resin remnant on the tooth surface after bracket debonding.
Patusco
Virna Cavalcante
VC
Department of Orthodontics, Federal University of Goiania, Goiania, Brazil. virnapatusco@hotmail.com
Montenegro
Gil
G
Lenza
Marcos Augusto
MA
Alves de Carvalho
Adilson
A
D001641:Bicuspid; D000077463:Carbamide Peroxide; D001840:Dental Bonding; D003799:Dental Stress Analysis; D004338:Drug Combinations; D006801:Humans; D006861:Hydrogen Peroxide; D016910:Orthodontic Brackets; D016877:Oxidants; D010545:Peroxides; D019279:Resin Cements; D033081:Shear Strength; D014073:Tooth Bleaching; D014508:Urea / Q000031:analogs & derivatives
D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; D019279:Resin Cements; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide