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Published on: June 6, 2025
Nd:YAG laser ablation and acid resistance of enamel
Yong Hoon Kwon1, Oh-Won Kwon, Hyung-Il Kim
1Department of Dental Biomaterials, College of Dentistry, Kyungpook National University, 2-188-1 Samduk-dong Jung-gu, Daegu 700-422, Korea.
Abstract:
The acid resistance of Nd:YAG laser-ablated enamel surfaces was studied by evaluating crystal structure, mineral distribution, and fluorescence radiance and image in the present study. For comparison, 37% phosphoric acid etching was performed. The formation of beta-tricalcium phosphate (beta-TCP) was confirmed in the laser-ablated surface. The Ca/P ratio increased after ablation due to mineral re-distribution. In contrast, the Ca/P ratio decreased after acid etching due to mineral loss. The laser-ablated enamels showed a smaller increase of fluorescence radiances and less clear laser confocal scanning microscope images than those observed in the acid-etched enamels. The former suggests a minimized mineral loss. The Nd:YAG laser irradiation will enhance the acid resistance and retard the carious progression in enamel.
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