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13 October 2005 Experimental and mechanism investigation on caries prevention by Nd:YAG laser
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The aim is to study the effectiveness of continuous Nd:YAG laser inhibiting caries progression of human enamel. After surface polishing, enamel blocks irradiated by different power laser and control group were put into 5ml of lactate buffer solution (0.1mol/L), which was in water of 37°C for 72 hours. The microhardness and morphology of enamel surface were investigated by microhardness tester and scanning electron microscopy. Compared with control, the group with 0.3W laser treatment has the least caries lesion (p<0.001). At the same time, the mechanism of caries prevention and acid resistance by laser was discussed in detail. We drew a conclusion that the change of contents in enamel and crystal orientations and partial decomposition of the organic matrix might be the main reason for enhancing the acid resistance ability of enamel. And best caries inhibition could be achieved when the temperature rising of enamel surface was in the range of 300~400°C by laser parameters being controlled suitably.
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Li Liu and Zheng-jia Li "Experimental and mechanism investigation on caries prevention by Nd:YAG laser", Proc. SPIE 5969, Photonic Applications in Biosensing and Imaging, 596921 (13 October 2005);

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