Comparative Evaluation of Shear Bond Strength of Recycled Brackets using Different Methods: An In vitro Study.
BACKGROUND
Debonding of brackets commonly occurs during orthodontic treatment. Due to increase in costs replacement of a damaged bracket is not liked by the dentist. This study is done to assess the shear bond strength of recycled brackets using different methods.


METHODS
This study was conducted using five groups of orthodontic brackets (0.022" × 0.028", MBT prescription) bonded on the premolars mounted in cubes. Other materials required were cubical trays, bonding material, light cure unit, universal testing machine, digital camera and sandblasting unit.


RESULTS
From the result of ANOVA test we observed the test is significant (F = 20.79, P < 0.01) and the test is rejected. When the Tukey's t-test result was applied it was seen that the mean shear bond strength of all groups of brackets is as follows: Group I (5.31 Megapascals [Mpa]) < Group II (7.37 Mpa) < Group III (8.96 Mpa) < Group IV (5.56 Mpa) < Control group (9.24 Mpa). Alternatively we can say that shear bond strength of following bracket groups can be arranged as Group I < Group IV < Group II < Group III.


CONCLUSIONS
From this study we conclude that Group III, which was recycled with an ultrasonic cleaner with electropolisher and silane coupling agent in place of primer, showed the highest shear bond strength.
Professor, Department of Orthodontics, Teerthanker Mahaveer Dental College and Research Centre, Moradabad, Uttar Pradesh, India.
Mukesh
M
Kumar
Professor, Department of Orthodontics, ACPM Dental College & Hospital, Dhule, Maharashtra, India.
Amit
A
Maheshwari
Professor, Department of Orthodontics, Hazaribagh College of Dental Sciences, Hazaribagh, Jharkhand, India.
Rajeev
R
Lall
Senior Lecturer, Department of Orthodontics, Chandra Dental College, Lucknow, Uttar Pradesh, India.
Pragati
P
Navit
Post Graduate Student, Department of Orthodontics, Teerthanker Mahaveer Dental College and Research Centre, Moradabad, Uttar Pradesh, India.
Rajeshwar
R
Singh
Professor, Department of Pedodontics, Saraswati Dental College, Lucknow, Uttar Pradesh, India.
S
S
Navit
Recycling; shear strength; stainless steel