Nd：YAG激光清除龋坏牙本质的作用：扫描电镜研究

清除龋坏牙本质是Ｎｄ：ＹＡＧ激光在口腔科的重要应用之一。本研究目的的评价Ｎｄ：ＹＡＧ激光应用于清除龋坏牙本质的效果以及对龋坏下正常牙本质形态改变的应用。实验用Ｎｄ：ＹＡＧ激光照射处理离体牙牙本本质浅龋区，然后对实验区作扫描电镜观察。结果发现：激光参数在１５ｐｐｓ，６０ｍＪ／ｐ时，牙本质表面龋坏组织基本清除干净，牙本质小管口缩小，管间牙本质粗糙。

Removal of Caries in Dentin Using Nd:YAG Laser: a SEM Study.

Caries removal is one of the important potential uses of Nd:YAG laser. The puropse of this study is to evaluate the effect and the dentin morphological changes from Nd:YAG laser treatment for removing caries. In the study, dentin caries on extracted teeth were lased and then examined under SEM. It was found at low energy of 60mJ/p and a frequency of 15pps, caries was almost cleared, tubular orifices reduced, peritubular dentin became rough. Energy of 80mJ/p removed all caries leaving a melted and recrystallized surface. When the energy reached 100mJ/p, the ultrastructure of dentin was throughly destroyed. In concluson, Nd:YAG laser is effective on removing caries in dentin and causing superficial morphological changes. These changes could do good to reduce post-restorative sensitivity and prevent secondary caries.