The effect of bleaching of teeth on the bond strength of brackets: An in vitro study.
OBJECTIVE
To determine the reversal effect of 10% sodium ascorbate, on the bond strength of previously bleached teeth with hydrogen peroxide.


METHODS
Sixty extracted maxillary premolars were selected and they were divided randomly into three groups. Group A teeth were etched and bonded; Group B bleached, etched and immediately bonded; Group C was subjected to bleaching, followed by treatment with 10% sodium ascorbate solution, then etched and bonded; Then all the three groups were subjected to testing procedure for bond strength.


RESULTS
The bond strength analysis was carried out by using instron, universal testing machine. In this study Group A had the maximum bond strength of 12.24 Mpa followed by Group C 11.62 Mpa and Group B 10.96 Mpa.


CONCLUSIONS
Group C the experimental group which was treated with 10% sodium ascorbate following bleaching with 35% hydrogen peroxide provided higher bond strength compared to Group B which was bonded immediately after bleaching even though it was not statistically significant.
Department of Orthodontics and Dentofacial Orthopedics, Vinayaka Missions Sankarachariyar Dental College, Salem, Tamil Nadu, India.
Shiji
S
Kunjappan
Vadivel
V
Kumaar
Prithiviraj
Vasanthan
Syed Altaf
SA
Khalid
Joseph
J
Paul
Bond strength; debonding; shear bond strength