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Authors:
Abdelali HALIMI, Bony Lama, Amine Cheikh, Fatima Zaoui, Morocco
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Abstract:
Background: The adhesives used to bond lingual bonded
retainers are low-loaded composite resins with a resinous matrix containing
bisphenol A and other molecules. To
investigate and quantify the release of BPA from these retainers.
Methods: Three types of orthodontic bond were selected randomly from the most
popular orthodontic composites: Transbod XT, Master-Dent® Flow and
Nanocomposite Proclinic Expert. Specimens were made using a metallic
parallelepiped mold and polymerized for 20 seconds with an LED lamp. Each cured sample was immediately immersed in artificial saliva with
different pH levels (7, 4, 2). Samples were analyzed at t0,
t1 and t2 using a High-Performance Liquid Chromatography. Data were analyzed using a
statistical package for social sciences. One-factor Anova and Anova for
repeated measurements tests were used. A value of p less than 0.05 was
considered statistically significant.
Results: The
analyses showed BPA release from Proclinic, although both Transbond XT and
Master-Dent® didn’t show any release of BPA in saliva (p>0.05). Release from
Proclinic was influenced by the pH of medium (p<0.05) and the immersion time
(p<0.05), thereby
the more the pH decreased the more the amount of BPA increased (p<0.05) and
as the immersion time increased the amount of BPA increased (p<0.05). The maximum amount of BPA reached from Proclinic was
0.680µg/ml and 1.032µg/ml at t2-Ph4 and t2-Ph2 respectively.
Conclusions: The different amounts of BPA released
from Proclinicremain relatively lower than the tolerable daily intake of BPA, but clinicians should
be careful about the use of composites.
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