Garg Akansha, Nagpal Ajay, Shetty Shashit, Kumar Sunil, Singh Kamal Krishan, Garg Amit
Post graduate Student, Department of Conservative Dentistry & Endodontics, Kanti Devi Dental College and Hospital , Mathura, Uttar Pradesh, India .
Reader, Department of Conservative Dentistry & Endodontics, Kanti Devi Dental College and Hospital , Mathura, Uttar Pradesh, India .
J Clin Diagn Res. 2015 Feb;9(2):ZC47-9. doi: 10.7860/JCDR/2015/11100.5596. Epub 2015 Feb 1.
To evaluate and compare the amount of time required by three rotary NiTi instruments in removing gutta-percha from root canal during retreatment with hand file as control.
Eighty human mandibular premolars with single straight root canals were prepared and obturated by cold lateral condensation with gutta-percha and AH Plus sealer. After two weeks, the 80 teeth were divided into one control group and 3 retreatment groups (n = 20 each). Gutta-percha was removed using H-files, the D-RaCe, or the Mtwo or the R-Endo retreatment systems. Retreatment time was calculated using stopwatch.
D-RaCe and Mtwo required significantly less time than R-Endo and hand file. Hand file took maximum time, which was significantly slower than all groups. However, D-RaCe and Mtwo retreatment time was statistically insignificant.
D-RaCe and Mtwo remove gutta-percha faster than R-Endo and Hand files.
评估并比较三种旋转镍钛器械在根管再治疗过程中与手动锉（作为对照）去除根管内牙胶所需的时间。
选取80颗具有单一直根管的人下颌前磨牙，采用冷侧向加压法用牙胶和AH Plus封闭剂进行预备和充填。两周后，将这80颗牙齿分为1个对照组和3个再治疗组（每组n = 20）。使用H锉、D-RaCe、Mtwo或R-Endo再治疗系统去除牙胶。使用秒表计算再治疗时间。
D-RaCe和Mtwo所需时间明显少于R-Endo和手动锉。手动锉花费的时间最长，明显比所有组都慢。然而，D-RaCe和Mtwo的再治疗时间在统计学上无显著差异。
D-RaCe和Mtwo去除牙胶的速度比R-Endo和手动锉更快。
