Bond efficacy of recycled orthodontic brackets: A comparative in vitro evaluation of two methods.
BACKGROUND
Recycling of orthodontic brackets in developing orthodontic economies is an extremely common procedure. Bonding protocols and reliability of these brackets is, however, questionable, and still the subject of research.


OBJECTIVE
The aim was to evaluate and compare the shear bond strength of brackets recycled with sandblasting and silicoating.


METHODS
Ninety extracted human premolars were bonded with 0.022" SS brackets (American Orthodontics, Sheboygan USA) and then debonded. The debonded brackets were divided into three groups of 30 each. Group I: Sandblasting with 50-μm aluminum oxide (control group) Group II: Sandblasting with 50-μm aluminum oxide followed by metal primer application Group III: Silicoating with 30-μm Cojet sand followed by silane application and rebonded with Transbond XT. The sandblasted brackets and silicoated brackets were viewed under the scanning electron microscope, immediately after surface conditioning before rebonding. The shear bond strength with each group was tested.


METHODS
One-way analysis of variance, post-hoc Scheffe multiple comparison tests.


RESULTS
The results showed that sandblasting created more irregularities and deeper erosions while silica coating created superficial irregularities and shallow erosions.
Department of Orthodontics, YMT Dental College and Hospital, Navi Mumbai, Maharashtra, India.
Vikram
V
Shetty
Yash
Y
Shekatkar
Neesu
N
Kumbhat
G
G
Gautam
Shalan
S
Karbelkar
Meghna
M
Vandekar
D006801:Humans; D008422:Materials Testing / Q000379:methods*; D016910:Orthodontic Brackets; D033081:Shear Strength; D013193:Stainless Steel / Q000737:chemistry; D013499:Surface Properties
D013193:Stainless Steel