Wang Qian-Qian, Zhang Cheng-Fei, Yin Xing-Zhe
Special Dental Department, Peking University School and Hospital of Stomatology, Beijing, China.
J Endod. 2007 Jul;33(7):830-2. doi: 10.1016/j.joen.2007.03.017. Epub 2007 May 7.
The aim of this study was to evaluate the bactericidal effect of the Er,Cr:YSGG laser and the Nd:YAG laser in experimentally infected root canals. Sixty single-rooted teeth with straight canals were selected. After preparation and sterilization, the specimens were inoculated with Enterococcus faecalis for 3 weeks. After irradiation by lasers, the number of bacteria in each root canal was examined. The Er,Cr:YSGG laser gave a reduction of 77% after irradiation at 1 W and 96% at 1.5 W, but there was no significant difference (p > 0.05). The Nd:YAG laser gave a reduction of 97% at 1 W and 98% at 1.5 W, and there was no significant difference (p > 0.05). Compared with the Er,Cr:YSGG laser, the Nd:YAG laser is more effective (p < 0.05). In conclusion, both lasers systems have a significant bactericidal effect in infected root canals, and the Nd:YAG laser is more effective than the Er,Cr:YSGG laser.
钇钪镓石榴石激光（Er,Cr:YSGG激光）和钕：钇铝石榴石激光（Nd:YAG激光）对实验性感染根管的杀菌效果。选取了60颗根管笔直的单根牙。根管预备和消毒后，将粪肠球菌接种到样本上3周。激光照射后，检测各根管内的细菌数量。Er,Cr:YSGG激光在1W功率照射后细菌数量减少了77%，在1.5W功率照射后减少了96%，但差异无统计学意义（p>0.05）。Nd:YAG激光在1W功率照射后细菌数量减少了97%，在1.5W功率照射后减少了98%，差异无统计学意义（p>0.05）。与Er,Cr:YSGG激光相比，Nd:YAG激光更有效（p<0.05）。总之，两种激光系统在感染根管中均有显著的杀菌效果，且Nd:YAG激光比Er,Cr:YSGG激光更有效。
