Restricted accessResearch articleFirst published online 2014-12
Effects of Near Infrared Laser Radiation Associated with Photoabsorbing Cream in Preventing White Spot Lesions Around Orthodontic Brackets: An in Vitro Study
Objective: The present study aims to investigate the effect of a low-power infrared laser on the inhibition of bovine enamel demineralization around orthodontic brackets. Background data: Near infrared lasers have been suggested as alternative approaches because they may produce an increase in resistance to dental caries. Methods: Forty-eight blocks of enamel obtained from bovine incisor teeth were divided into six groups: Group 1 (control), without treatment; Group 2 (C), photoabsorbing cream; Group 3 (CF), photoabsorbing cream with fluoride; Group 4 (L), irradiation with low-level infrared laser (λ=830 nm) at an energy density of 4.47 J/cm2; Group 5 (L+C), photoabsorbing cream followed by low-level infrared laser irradiation; and Group 6 (L+CF), photoabsorbing cream with fluoride followed by low-level infrared laser irradiation. After these procedures, the enamel blocks received an assortment of orthodontic brackets and were then submitted to pH cycling to simulate a highly cariogenic challenge. The enamel surface demineralization around the orthodontic brackets, according to the different treatments, was quantified by fluorescence loss analysis by quantitative light-induced fluorescence (QLF). The fluorescence loss, expressed as ΔF (percentage of loss fluorescence), was statistically examined by analysis of variance and the Tukey test. Results: The control group (−10.48±2.85) was statistically similar to Group C (−14.52±7.80), which presented the lowest values of ΔF when compared with Groups FC (−3.67±3.21), L (−2.79±1.68), CL (−1.05±0:50), and CFL (−0.60±0:43). However, Groups FC, L, CL, and CFL showed no statistically significant differences among them. Conclusions: It can be concluded that both the low-level infrared laser and photoabsorbing cream with fluoride were effective in inhibiting the development of caries in enamel around orthodontic brackets, even in situations of high cariogenic challenge.
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