Moritz A, Schoop U, Goharkhay K, Jakolitsch S, Kluger W, Wernisch J, Sperr W
Department of Conservative Dentistry, Dental School of the University of Vienna, Waehringerstrasse 25a, Vienna, Austria.
J Clin Laser Med Surg. 1999;17(4):161-4. doi: 10.1089/clm.1999.17.161.
The aim of this study was to compare the antibacterial effectiveness of the Nd:YAG, the Ho:YAG, and the Er:YAG laser in infected root canals.
Lasers are gaining increasing importance in the field of endodontics. Numerous studies have shown the beneficial effects of laser treatment in disinfecting root canals.
In our in vitro experimental setup, 40 extracted and endodontically treated teeth were inoculated with a suspension of Escherichia coli and Enterococcus faecalis and then irradiated at standardized power settings. The disinfecting efficacy of each laser was proved by classical microbiological examination.
This article highlights that all three lasers substantially decreased the bacterial population with only minimal differences in their microbicidal efficacy. At 1.5 W, the best results were obtained by the Er:YAG laser achieving a mean bacterial elimination of 99.64%, followed by the Nd:YAG laser (99.16%), and the Ho:YAG laser (99.05%).
Our findings indicate that all three lasers act as strongly effective microbicides without causing unfavorable temperature rises at the settings used. They can thus be considered a valuable tool for root canal treatment.
本研究旨在比较钕钇铝石榴石（Nd:YAG）激光、钬钇铝石榴石（Ho:YAG）激光和铒钇铝石榴石（Er:YAG）激光在感染根管中的抗菌效果。
激光在牙髓病学领域正变得越来越重要。大量研究表明激光治疗在根管消毒方面具有有益效果。
在我们的体外实验装置中，40颗拔除并经过牙髓治疗的牙齿接种大肠埃希菌和粪肠球菌悬液，然后在标准化功率设置下进行照射。每种激光的消毒效果通过经典微生物学检查来证实。
本文强调，所有三种激光都能显著减少细菌数量，它们的杀菌效果仅有极小差异。在1.5瓦时，铒钇铝石榴石激光取得了最佳效果，平均细菌清除率达到99.64%，其次是钕钇铝石榴石激光（99.16%）和钬钇铝石榴石激光（99.05%）。
我们的研究结果表明，在所用设置下，所有三种激光都作为强效杀菌剂发挥作用，且不会引起不利的温度升高。因此，它们可被视为根管治疗的一种有价值的工具。
