Efficiency of light-emitting diode and halogen units in reducing residual monomers

Introduction In this in-vitro study, we aimed to compare the residual monomers in composites beneath brackets bonded to enamel, using a light-emitting diode (LED) or a halogen unit, and to compare the residual monomers in the central to the peripheral areas of the composite. Methods Twenty bovine te...

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Bibliographic Details
Published in:American journal of orthodontics and dentofacial orthopedics 2010-11, Vol.138 (5), p.617-622
Main Authors: Carvalho, Felipe de Assis Ribeiro, Almeida, Rhita C, Almeida, Marco Antonio, Cevidanes, Lucia H.S, Leite, Marcia C. Amorim M
Format: Article
Language:English
Subjects:
Acid Etching, Dental
Animals
Biological and medical sciences
Bisphenol A-Glycidyl Methacrylate - chemistry
Bisphenol A-Glycidyl Methacrylate - radiation effects
Cattle
Composite Resins - chemistry
Composite Resins - radiation effects
Curing Lights, Dental - classification
Dental Debonding - instrumentation
Dental Enamel - ultrastructure
Dentistry
Materials Testing
Medical sciences
Orthodontic Brackets
Otorhinolaryngology. Stomatology
Phosphoric Acids - chemistry
Polyethylene Glycols - chemistry
Polyethylene Glycols - radiation effects
Polymethacrylic Acids - chemistry
Polymethacrylic Acids - radiation effects
Resin Cements - chemistry
Resin Cements - radiation effects
Spectrophotometry, Infrared
Surface Properties
Temperature
Time Factors
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Summary:Introduction In this in-vitro study, we aimed to compare the residual monomers in composites beneath brackets bonded to enamel, using a light-emitting diode (LED) or a halogen unit, and to compare the residual monomers in the central to the peripheral areas of the composite. Methods Twenty bovine teeth preserved in 0.1% thymol were used in this study. Ten teeth were used to standardize the thickness of the composite film, since different thicknesses would cause different absorbance of light. Brackets were bonded to 10 bovine incisors, with the halogen light (n = 5) and the LED (n = 5). The brackets were debonded, and the remaining composite on the enamel surface was sectioned in 2 regions: peripheral (0.8 mm) and central, resulting in 2 subgroups per group: central halogen (n = 5), peripheral halogen (n = 5), central LED (n = 5), and peripheral LED (n = 5). The spectrometric analysis in the infrared region was used to measure the free monomers with the attenuated total reflectance method. Results Normal distribution was tested by using the Kolmogorov-Smirnov test. Data were compared by 2-way analysis of variance (ANOVA) at P
ISSN:0889-5406
1097-6752
DOI:10.1016/j.ajodo.2008.10.023