Takeda F H, Harashima T, Kimura Y, Matsumoto K
Department of Endodontics, Showa University School of Dentistry, Tokyo, Japan.
J Endod. 1998 Aug;24(8):548-51. doi: 10.1016/S0099-2399(98)80075-7.
The purpose of this study was to evaluate the efficacy of Er:YAG laser irradiation in removing debris and smear layer from prepared root canal walls. Thirty-six human extracted mandibular incisors teeth were divided into three groups. Group 1 (G1) was control specimens that were not lased. The teeth of group 2 (G2) and group 3 (G3) were irradiated by Er:YAG laser at different watt powers of 1 W and 2 W. The teeth were bisected and prepared for study in stereoscopic light microscope and SEM. Control specimens showed an amount of debris and heavy smear layer obscuring the dentinal tubules at all levels in the canals. The root canal walls irradiated by Er:YAG laser were free of debris, with an evaporated smear layer and open dentinal tubules. Statistical analyses showed significant differences (p < 0.01) in cleanliness smear layer between G1 and G2, and G1 and G3. However, there was no statistically significant difference between G2 and G3 in the cleanliness of the middle and apical one-third of the root canals. These results show Er:YAG laser is effective in removing debris and smear layer from root canal walls.
本研究的目的是评估铒钇铝石榴石（Er:YAG）激光照射对去除预备根管壁上的碎屑和玷污层的效果。三十六颗拔除的人下颌切牙被分为三组。第一组（G1）为未接受激光照射的对照样本。第二组（G2）和第三组（G3）的牙齿分别接受1W和2W不同功率的Er:YAG激光照射。将牙齿对半切开，制备用于体视显微镜和扫描电子显微镜研究的样本。对照样本显示根管各层面均有一定量的碎屑和厚重的玷污层，遮盖了牙本质小管。接受Er:YAG激光照射的根管壁无碎屑，玷污层蒸发，牙本质小管开放。统计分析显示，G1与G2、G1与G3之间在玷污层清洁度方面存在显著差异（p < 0.01）。然而，G2和G3在根管中1/3和根尖1/3的清洁度方面无统计学显著差异。这些结果表明，Er:YAG激光在去除根管壁上的碎屑和玷污层方面是有效的。
