Nd:YAG激光照射牙本质敏感牙和根管内壁病理、扫描电镜观察

应用不同能量的脉冲Nd：YAG激光照射牙本质敏感牙和根管内壁，观察其病理及扫描电镜改变。结果表明，低功率，高能量密度激光照射，对正常牙组织无损伤；扫描电镜观察牙本质产生熔融层可伸入牙本质小管15μm，封闭部份小管口，达到治疗作用；根管内壁经常规处理与常规处理加激光照射后对照，经照射壁表玷污层消除，产生熔融层，有利于牙根治疗。

Observation of Hypersensitive Dentin and Inner Wall of Root Canal after Pulsed Nd: YAG Laser Irradiation

In order to study the effect of pulse Nd:YAG laser on hypersensitive dentin and inner wall of root canal.The morphologi- cal changes were observed with a SEM.The results showed that the low power with high energy density.Laser irradiation did not do harm to normal teeth tissue.The melted layer of dentin matrix extended to dentinal tubles,and the dentinal tubles were sealed to a depth of 15 um.The conventional preparation of root canal with laser irradiation provided much advantage in clearing the stained layer of inner wall in comparison with conwentional preparation of root canal alone.