Title :
Experiment and mechanism investigation on acid resistance of Nd:YAG laser treated enamel
Author :
Liu, Li ; Li, Zhengjia
Author_Institution :
Wuhan Univ. of Sci. & Eng., China
Abstract :
The effectiveness of Nd:YAG laser treatment on in vitro acid resistance of human enamel was studied. After surface polishing, enamel blocks irradiated by different power laser and control group were put into 5 ml of lactate buffer solution (0.1mol/L). which was in water of 37 for 72 hours. The hardness and morphology of enamel surface were investigated by microhardness meter and scanning electron microscopy. Compared with control, the group with 0.3 W 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 acid resistance. 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.
Keywords :
crystal orientation; dentistry; enamels; laser applications in medicine; microhardness; neodymium; organic compounds; scanning electron microscopy; solid lasers; 0.3 W; 300 to 400 C; 37 to 72 h; Nd:YAG laser treated enamel; YAG:Nd; YAl5O12:Nd; acid resistance; crystal orientation; enamel surface; lactate buffer solution; laser treatment; microhardness meter; organic matrix; scanning electron microscopy; surface polishing; Electrons; Humans; Immune system; In vitro; Optical control; Power lasers; Surface emitting lasers; Surface morphology; Surface resistance; Surface treatment;
Conference_Titel :
Advanced Optoelectronics and Lasers, 2005. Proceedings of CAOL 2005. Second International Conference on
Print_ISBN :
0-7803-9130-6
DOI :
10.1109/CAOL.2005.1553892
