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标题：Microhardness and morphological changes induced by Nd:Yag laser on dental enamel: an in vitro study
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作者：Rossella Bedini(a) ; Licia Manzon(b) ; Giovanni Fratto(b) 等
期刊名称：Annali dell'Istituto Superiore di Sanita
印刷版ISSN：0021-2571
出版年度：2010
卷号：46
期号：02
出版社：Editrice Kurtis Srl
摘要：Summary. The aim of this work was a scanning electron microscopy (SEM) evaluation of the hardness and morphological changes of enamel irradiated by neodymium: yttrium aluminium garnet (Nd:YAG) laser with different energy levels. Twenty-eight human teeth samples were divided into 4 groups: control, where enamel surface was not lased, and 3 test treated with 3 different levels of energy power 0.6, 1.2 and 2.4 Watt, respectively. In each group, 5 samples underwent Vickers microhardness test and 2 samples were processed for SEM. No significant differences between treated and non treated samples were found by micro-hardness test. However, by SEM, test samples showed a rougher enamel surface than control. Specifically, the 0.6 Watt treated samples showed vertical scratches and glass-like areas, while in the other 2 groups enamel surface was covered by craters and cracks. These findings suggest that enamel should be lased at a low energy level to preserve its integrity and reduce demineralization, and thus for dental caries prevention purposes; while high energy level creates a retentive surface suitable for sealant or composite anchorage.
关键词：Key words: energy power, micro-hardness, Nd:YAG laser, microscopy, electron, scanning.