Levy G, Rizoiu I, Friedman S, Lam H
Laser Hard Tissue Institute, San Clemente, CA, USA.
J Endod. 1996 Feb;22(2):81-4. doi: 10.1016/S0099-2399(96)80278-0.
Recently, root canal preparation using Nd:YAG laser has been introduced. Laser interaction with matter may generate cavitation and subsequent pressure waves. This study characterized the pressure waves induced in root canals by either Nd: YAG laser, sonically vibrated files, or ultrasonically vibrated files. The root canals of 14 single-rooted teeth were prepared conventionally and filled with water. In 12 teeth, a pulsed Nd:YAG laser was activated in the canal using optical fibers of various diameters and various power settings. In the remaining two teeth, either a sonic or ultrasonic file was activated. The pressure waves induced in the canals were detected by a piezoelectric transducer. The results were analyzed using correlation coefficient and coefficient of variation. Laser irradiation resulted in pressure waves with amplitudes varying from 35.78 to 79.26 mV, being positively correlated with the laser power density (R2 = 0.870). Sonic and ultrasonic vibrations resulted in pressure waves with mean amplitudes of 60.51 mV and 7.02 mV, respectively. It was concluded that Nd:YAG laser irradiation induced pressure waves, with different characteristics from waves induced by freely vibrating sonic and ultrasonic endodontic instruments when applied to water-filled root canals.
最近，已引入使用钕钇铝石榴石（Nd:YAG）激光进行根管预备。激光与物质相互作用可能会产生空化及随后的压力波。本研究对由Nd:YAG激光、声波振动锉或超声振动锉在根管中诱导产生的压力波进行了表征。对14颗单根牙的根管进行常规预备并充满水。在12颗牙中，使用不同直径和不同功率设置的光纤在根管中激活脉冲Nd:YAG激光。在其余两颗牙中，激活声波锉或超声锉。通过压电换能器检测根管中诱导产生的压力波。使用相关系数和变异系数对结果进行分析。激光照射产生的压力波振幅在35.78至79.26 mV之间变化，与激光功率密度呈正相关（R2 = 0.870）。声波和超声振动产生的压力波平均振幅分别为60.51 mV和7.02 mV。得出的结论是，当应用于充满水的根管时，Nd:YAG激光照射诱导产生的压力波具有与自由振动的声波和超声根管器械诱导产生的波不同的特征。
