Assessment of bisphenol-A release from orthodontic adhesives.
BACKGROUND
The aim of this study was to quantitatively characterize the bisphenol-A (BPA) released from orthodontic adhesives after artificial accelerated aging.


METHODS
A chemically cured, no-mix adhesive and a visible light-cured adhesive were bonded to 40 stainless steel brackets divided in 2 groups of 20 brackets each. In total, 3 series of specimens were prepared for each adhesive-bracket group. All specimens were immersed in alcohol to induce accelerated aging. Samples of eluent removed from each group at 1 day and at 1, 3, and 5 weeks after aging were processed with high-pressure liquid chromatography; all assays were performed in triplicate, and the results were averaged.


RESULTS
No trace of BPA was identified for either adhesive across all time intervals, implying that, if present, the amount of BPA did not exceed the detection limit of the analytical technique (0.1 ppm or 0.1 microg/L).


CONCLUSIONS
BPA release from light-cured or chemically cured, no-mix adhesives did not reach the 0.1 ppm level. Estrogenicity assays are required to clarify the potential estrogenicity of adhesives, whereas formulation of benzoic ring-free, high molecular weight monomers might eliminate the concerns associated with the use of Bis-GMA.
Eliades
Theodore
T
Department of Orthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece. teliades@ath.forthnet.gr
Hiskia
Anastasia
A
Eliades
George
G
Athanasiou
Athanasios E
AE
D000704:Analysis of Variance; D001559:Benzhydryl Compounds; D002851:Chromatography, High Pressure Liquid; D004355:Drug Stability; D016910:Orthodontic Brackets; D010636:Phenols / Q000032:analysis*; D019279:Resin Cements / Q000737:chemistry*; D000098826:Bisphenol A Compounds
D001559:Benzhydryl Compounds; D010636:Phenols; D019279:Resin Cements; C090340:Reliance resin cement; C097531:Rely a Bond system; C006780:bisphenol A; D000098826:Bisphenol A Compounds