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https://doi.org/10.1016/j.jdent.2006.08.006
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. https://doi.org/10.1016/j.jdent.2006.08.006 | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/46725 | ISSN: | 03005712 | DOI: | 10.1016/j.jdent.2006.08.006 |
Appears in Collections: | Staff Publications |
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