Yamazaki R, Goya C, Yu D G, Kimura Y, Matsumoto K
Department of Endodontics, Showa University School of Dentistry, Tokyo, Japan.
J Endod. 2001 Jan;27(1):9-12. doi: 10.1097/00004770-200101000-00003.
The present study evaluates the morphological changes in root canal walls and temperature changes at root surfaces as a result of intracanal irradiation by erbium,chromium:YSGG laser under various conditions in vitro. Sixty single-rooted human teeth were examined. Root canals were prepared, and laser irradiation was performed using an optic fiber at output powers ranging from 1 to 6 W with or without water spray cooling. Specimens were evaluated by stereoscopy, scanning electron microscopy, and thermography. Carbonization and cracks were observed in all samples irradiated without cooling, whereas little or no carbonization and no smear layer or debris were observed in samples irradiated with cooling. Maximum temperature rise at irradiation without cooling was above 37 degrees C, whereas that at irradiation with cooling was 8 degrees C. Results of the present study indicate that erbium,chromium:YSGG laser irradiation with water spray cooling is a useful method for removal of smear layer and debris from root canals.
本研究评估了在体外不同条件下，铒铬：钇铝石榴石激光进行根管内照射后根管壁的形态变化以及牙根表面的温度变化。对60颗单根人牙进行了检查。预备根管后，使用光纤在1至6瓦的输出功率下进行激光照射，照射时使用或不使用喷水冷却。通过立体显微镜、扫描电子显微镜和热成像对样本进行评估。在未冷却照射的所有样本中均观察到碳化和裂纹，而在冷却照射的样本中几乎没有观察到碳化，也没有玷污层或碎屑。未冷却照射时的最高温度上升超过37摄氏度，而冷却照射时为8摄氏度。本研究结果表明，喷水冷却的铒铬：钇铝石榴石激光照射是一种从根管中去除玷污层和碎屑的有效方法。
