Evaluation of the amount of bisphenol released in the saliva after residual adhesive removal in orthodontic patients by ultrasonic scaling and rotary system: single center - randomized clinical trial

Abstract

Backgrounds and Objectives: Bisphenol A (BPA), a substance with noxious properties, is commonly used in dental materials. Its monomers may dissolve in the saliva resulting in adverse effects. This study was purposed to evaluate the amount of BPA released in the saliva after residual adhesive removal in orthodontic patients by ultrasonic scaler (US) and tungsten carbide bur (TCB).

Materials and Methods: This single-center, randomized clinical trial was conducted on 40 patients received metal orthodontic brackets bonded with Resilience orthodontic adhesive system. Subjects were randomly divided into two groups (n=20) according to adhesive elimination method: TCB and US. Clean-up time (minute) was measured by stopwatch and the levels of salivary BPA (micrograms/milliliter) was determined with high-performance liquid chromatography/mass spectrometry. Data were analysed by SPSS 18 using independent t-test and ANCOVA (P<0.05).

Results: TCB method displayed significant lower values compare to US method in terms of salivary BPA level (1.008±0.061 vs. 2.83±0.24 micrograms/milliliter; P<0.001) and adhesive clean-up time (8.86±0.83 vs. 13.20±1.02 minute; P<0.001).

Conclusion: According to our findings, residual adhesive removal with TCB is superior to US with respect to clean-up time and bisphenol A released in saliva.