Asnaashari Mohammad, Godiny Mostafa, Azari-Marhabi Saranaz, Tabatabaei Fahimeh Sadat, Barati Maryam
Department of Endodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Department of Endodontics, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran.
J Lasers Med Sci. 2016 Spring;7(2):99-104. doi: 10.15171/jlms.2016.17. Epub 2016 Mar 27.
The aim of this study was to compare the antibacterial efficacy of diode laser 810nm and photodynamic therapy (PDT) in reducing bacterial microflora in endodontic retreatment of teeth with periradicular lesion.
In this in vivo clinical trial, 20 patients who needed endodontic retreatment were selected. After conventional chemo mechanical preparation of root canals, microbiological samples were taken with sterile paper point (PP), held in thioglycollate broth, and then were transferred to the microbiological lab. In the first group, PDT with methylene blue (MB) and diode laser (810 nm, 0.2 W, 40 seconds) was performed and in the second group diode laser (810 nm, 1.2 W, 30 seconds) was irradiated. Then second samples were taken from all canals.
CFU/ml amounts showed statistically significant reduction in both groups (P < 0.001). CFU/ml amounts were compared between the two groups and there was no statistical difference.
PDT and diode laser 810 nm irradiation are effective methods for root canal disinfection. PDT is a suitable alternative for diode laser 810 nm irradiation, because of lower thermal risk on root dentin.
本研究的目的是比较810nm二极管激光和光动力疗法（PDT）在减少患有根尖周病变牙齿的根管再治疗中细菌微生物群方面的抗菌效果。
在这项体内临床试验中，选择了20名需要进行根管再治疗的患者。在对根管进行常规化学机械预备后，用无菌纸尖（PP）采集微生物样本，置于硫乙醇酸盐肉汤中，然后转移至微生物实验室。第一组采用亚甲蓝（MB）光动力疗法和二极管激光（810nm，0.2W，40秒）治疗，第二组照射二极管激光（810nm，1.2W，30秒）。然后从所有根管中采集第二个样本。
两组的菌落形成单位/毫升（CFU/ml）数量均显示出统计学上的显著减少（P<0.001）。比较两组的CFU/ml数量，无统计学差异。
光动力疗法和810nm二极管激光照射是根管消毒的有效方法。由于对牙根牙本质的热风险较低，光动力疗法是810nm二极管激光照射的合适替代方法。
