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Title: Optimal Er:YAG laser energy for preventing enamel demineralization
Authors: Liu, J.-F.
Liu, Y. 
Stephen, H.C.-Y. 
Keywords: Caries prevention
Enamel demineralization
Er:YAG laser
Polarized light microscopy
Issue Date: 2006
Citation: Liu, J.-F., Liu, Y., Stephen, H.C.-Y. (2006). Optimal Er:YAG laser energy for preventing enamel demineralization. Journal of Dentistry 34 (1) : 62-66. ScholarBank@NUS Repository.
Abstract: Objectives: The purpose of this study was to identify the optimal laser energy range of Er:YAG laser irradiation for laser-induced caries prevention (LICP). Methods: Twenty-one human non-carious molars were selected. The teeth were covered with nail varnish, except two 4 mm x 1 mm windows on both the buccal and lingual surfaces. The windows were randomly assigned to groups A, B, C and D, receiving no irradiation, 100, 200 and 300 mJ irradiation, respectively. The pulse width 10 pps (pulse per second) with a 1.0 mm spot size was used. After the laser treatment, each tooth was cut into two halves longitudinally. Then a two-day pH-cycling was performed, with an 18-hour demineralization followed by a 6-hour remineralization. Sections of 120±20 μm in thickness were obtained from each window. Lesion depth was measured using polarized light microscope coupled with an image analysis software. One-way ANOVA and post-hoc Tukey tests were used for evaluation of treatment effects. Results: The laser treatments of 100 and 200 mJ have demonstrated significant protection of enamel demineralization (p=0.01 and 0.001, respectively), but not the treatment with 300 mJ (p=0.106). A smaller lesion depth was observed for the 200 mJ group (97.1 μm) than that of the 100 mJ group (105.6 μm). Compared with the control, a lesion reduction of 32.78 and 26.93% for the 200 mJ group and the 100 mJ group were obtained, respectively. Conclusion: Caries prevention may be achieved by using Er:YAG laser treatment if the optimal range of laser parameters for LICP can be employed. © 2005 Elsevier Ltd. All rights reserved.
Source Title: Journal of Dentistry
ISSN: 03005712
DOI: 10.1016/j.jdent.2005.03.005
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