da Costa Ribeiro Adriana, Nogueira Gessé Eduardo Calvo, Antoniazzi João Humberto, Moritz Andreas, Zezell Denise Maria
Departamento de Endodontia, Faculdade de Odontologia, Universidade de São Paulo, São Paulo, Brazil.
J Endod. 2007 Mar;33(3):252-5. doi: 10.1016/j.joen.2006.09.002. Epub 2006 Dec 13.
This study investigated the thermal effects and the morphological changes after diode laser irradiation (810 nm) of root canals. Samples were irradiated at 2.5 W, 1,989 W/cm2 (group 2) and 1.25 W, 10 Hz, 994 W/cm2 (group 3), with group 1 being the control group of nonirradiated samples. The temperature rise was evaluated using an infrared thermographic camera, and the morphological changes were assayed by scanning electron microscopy (SEM). The SEM images revealed closed dentinal tubules, especially at the apical regions when compared with the control samples. The maximum temperature variations at the apical region were analyzed, and the resulting 95% confidence intervals of the medians (Wilcoxon) ranged from 1.6 to 8.6 degrees C (group 2) and from 1.2 to 3.3 degrees C (group 3). The results suggest that the diode laser can be used for endodontic purposes and show that the method is safe for periodontal tissues at the investigated parameters.
本研究调查了二极管激光（810纳米）照射根管后的热效应和形态学变化。样本分别在2.5瓦、1989瓦/平方厘米（第2组）以及1.25瓦、10赫兹、994瓦/平方厘米（第3组）的条件下接受照射，第1组为未照射样本的对照组。使用红外热成像相机评估温度升高情况，并通过扫描电子显微镜（SEM）检测形态学变化。扫描电子显微镜图像显示牙本质小管封闭，尤其是与对照样本相比，根尖区域更为明显。分析了根尖区域的最大温度变化，中位数的95%置信区间（威尔科克森法）在第2组为1.6至8.6摄氏度，在第3组为1.2至3.3摄氏度。结果表明，二极管激光可用于牙髓病治疗目的，且在所研究参数下该方法对牙周组织是安全的。
