Nd:YAG激光和Er:YAG激光对根管内粪肠球菌杀灭效果的研究

［摘要］ 目的 观察Nd:YAG激光、Er:YAG激光及两者联用对根管内粪肠球菌的杀灭效果。方法 选取离体牙建立粪肠球菌感染模型，随机分为五组：A组：生理盐水组；B组：1%次氯酸钠溶液组；C组：Nd:YAG激光组；D组：Er:YAG激光组；E组：Nd:YAG激光+Er:YAG激光组。通过细菌培养和扫描电镜观察对比各组的杀菌效果。结果 细菌培养和扫描电镜结果显示：A组杀菌率最低，B组杀菌率最高，E组次高。除C组和D组间杀菌率相近外（P>0.05），各组间均有统计学差异（P<0.05）。结论 Nd:YAG激光和Er:YAG激光均有一定的根管杀菌效果，两者联用效果更佳，可作为传统消毒方法的补充。

Antimicrobial effect of Nd: YAG laser and Er: YAG laser on enterococcus faecalis in root canals

Objective　To evaluate the antimicrobial effect of Nd:YAG laser, Er:YAG laser and their combination on enterococcus faecalis in root canals. Methods　Teeth infected with enterococcus faecalis were randomly divided into five groups. Group A: normal saline (NS) irrigation; Group B: 1%NaClO irrigation; Group C: Nd:YAG laser; Group D: Er:YAG laser; Group E: Nd:YAG + Er:YAG laser. After treatment, teeth selected randomly from each group were observed using scanning electron microscopy (SEM). Bacteria were collected from the remaining root canals and cultured. Results　Among five groups, group A achieved least bacteria reduction while group B had best antimicrobial effect, followed by group E. Except for the similar bactericidal rate between group C and group D (P> 0.05), there was a significant difference among the groups (P <0.05). Conclusions　Nd:YAG laser, Er:YAG laser and their combination are effective in root canal disinfection and can been seen as supplements to routine methods.