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Published in: Lasers in Medical Science 1/2013

01-01-2013 | Original Article

Carbon dioxide laser and bonding materials reduce enamel demineralization around orthodontic brackets

Authors: Cíntia Maria de Souza-e-Silva, Thaís Manzano Parisotto, Carolina Steiner-Oliveira, Regianne Umeko Kamiya, Lidiany Karla Azevedo Rodrigues, Marinês Nobre-dos-Santos

Published in: Lasers in Medical Science | Issue 1/2013

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Abstract

Altering the structure of the enamel surface around the orthodontic bracket by reducing its content of carbonate and phosphate resulting from application of CO2 laser may represent a more effective strategy in preventing caries in this region. This study aimed at determining whether irradiation with a CO2 laser combined with fluoride-releasing bonding material could reduce enamel demineralization around orthodontic brackets subjected to cariogenic challenge. Ninety bovine enamel slabs were divided into five groups (n = 18): non-inoculated brain–heart infusion broth group, non-fluoride-releasing composite resin (NFRCR—control group), resin-modified glass ionomer cement (RMGIC), CO2 laser + Transbond (L+NFRCR) and CO2 laser + Fuji (L+RMGIC). Slabs were submitted to a 5-day microbiological caries model. The Streptococcus mutans biofilm formed on the slabs was biochemically and microbiologically analysed, and the enamel Knoop hardness number (KHN) around the brackets was determined. The data were analysed by ANOVA and Tukey tests (α = 0.05). Biochemical and microbiological analyses of the biofilm revealed no statistically significant differences among the groups. Lased groups presented the highest KHN means, which statistically differed from NFRCR; however, no difference was found between these lased groups. RMGIC did not differ from NFRCR which presented the lowest KHN mean. The CO2 laser (λ = 10.6 μm; 10.0 J/cm2 per pulse) use with or without F-bonding materials was effective in inhibiting demineralization around orthodontic brackets. However, no additional effect was found when the enamel was treated with the combination of CO2 laser and an F-releasing material.
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Metadata
Title
Carbon dioxide laser and bonding materials reduce enamel demineralization around orthodontic brackets
Authors
Cíntia Maria de Souza-e-Silva
Thaís Manzano Parisotto
Carolina Steiner-Oliveira
Regianne Umeko Kamiya
Lidiany Karla Azevedo Rodrigues
Marinês Nobre-dos-Santos
Publication date
01-01-2013
Publisher
Springer-Verlag
Published in
Lasers in Medical Science / Issue 1/2013
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-012-1076-5

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