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Title: Laser-induced compositional changes on enamel: A FT-Raman study
Authors: Liu, Y. 
Hsu, C.-Y.S. 
Keywords: Carbonate
Er:YAG laser
Human enamel
Organic matters
Raman spectroscopy
Issue Date: 2007
Citation: Liu, Y., Hsu, C.-Y.S. (2007). Laser-induced compositional changes on enamel: A FT-Raman study. Journal of Dentistry 35 (3) : 226-230. ScholarBank@NUS Repository.
Abstract: Preventive effects of lasers on enamel caries have been documented in the past few decades. However, its specific mechanism remains uncertain. Objectives: To evaluate the laser-induced change of enamel compositions, including carbonate and organic matters using Fourier-transform Raman spectroscopy (FT-Raman). Methods: Twelve windows (1 mm × 1 mm), created on six defect-free primary incisors, were characterized by FT-Raman microscopy (1024 nm) before and after Er:YAG laser treatment (Fidelis®) with 5.1 J/cm2-2 Hz-5s. To assess the statistical significance of laser effects, Raman peaks assigned to ν1 phosphate, type-A/B carbonates, and organic matters were evaluated with the paired-samples t-test. Results: The standardized intensity of type B carbonate decreased significantly from 0.117 to 0.106 (p = 0.029), whereas the standardized intensity of carbonate A remained unchanged (p = 0.467). Related to organic matters, the standardized intensity of peaks at 2940 cm-1 and in the ranges of 1200-1600 cm-1 decreased significantly, with p = 0.005 and p < 0.001, respectively. Revealing enamel crystallinity, the bandwidth of ν1 phosphate on lased surfaces appeared to be unaltered after laser treatment (p = 0.477). Conclusions: Laser treatment may provide caries-preventive effect on enamel through reduction of carbonate and modification of organic matters. © 2006 Elsevier Ltd. All rights reserved.
Source Title: Journal of Dentistry
ISSN: 03005712
DOI: 10.1016/j.jdent.2006.08.006
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