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以不同能量的Ｎｄ：ＹＡＧ激光照射牙齿感染根管，与常规机械预备相比较，通过扫描电镜（ＳＥＭ）观察根管内壁的形态学变化。结果表明：激光能量在１５Ｈｚ、６０ｍＪ即可引起管壁牙本质熔融，结合冲洗可有效去除玷污层；随着能量增加，牙本质小管可部分封闭，但不能完全闭合。提示Ｎｄ：ＹＡＧ激光在根管治疗术中具有应用前景
The root canal was infected with different energy Nd: YAG laser. Compared with the conventional mechanical preparation, the morphology of the root canal was observed by scanning electron microscope (SEM). The results show that laser energy can melt dentin in tube wall at 15Hz and 60mJ, and smear layer can be effectively removed when combined with irrigation. With the increase of energy, dentinal tubules can be partially closed but not completely closed. Tip Nd: YAG laser in root canal surgery has the application prospect