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.%Objective To evaluate the antimicrobial effects 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). Bacte-ria were collected from the remaining root canals and cultured.Results Among five groups,group A achieved the least bacteria reduc-tion while group B had the 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). Conclusion Nd:YAG laser,Er:YAG laser and their combination are effective in root canal disinfection and can been seen as supplements to routine methods.