UFR d'Odontologie, University of Bordeaux 2, Bordeaux, France.
Int Endod J. 2010 Feb;43(2):135-41. doi: 10.1111/j.1365-2591.2009.01653.x.
To evaluate the efficacy of the R-Endo rotary nickel titanium instrumentation system and hand instrumentation to remove gutta-percha or Resilon from root canals.
Eighty single-rooted teeth with straight canals were selected, the pulp chamber was opened, and the canals prepared to a size 30, 0.04 taper. The teeth were divided randomly into two groups of 40 each for root filling with gutta-percha + MMSeal sealer or Resilon + RealSeal sealer. After storage, each group was divided into two subgroups, and material was removed with Hedström files or with R-Endo instrumentation. Times to reach the working length and to eliminate filling material were recorded. Root canal walls were examined using scanning electron microscope to evaluate material remnants on each third. The presence of material was measured according to a score scale. The Student's t-test was used to determine significant differences between mean values of time and remaining material (P < 0.05).
No significant differences occurred between thirds, material or removal technique regarding remaining filling debris (P > 0.05). However, times to reach the working length and for removal of filling were lower with R-Endo than with Hedström files (P < 0.0001).
Both instrumentation techniques left filling material inside the root canal and mainly in the apical third. There was no difference between the instrumentation techniques.
评估 R-Endo 旋转镍钛器械系统和手用器械去除根管内牙胶或 Resilon 的效果。
选择 80 颗具有直根管的单根牙，打开牙髓腔，预备至 30 号，0.04 锥度。将牙齿随机分为两组，每组 40 颗，分别用牙胶+MMSeal 封固剂或 Resilon+RealSeal 封固剂进行根管充填。储存后，每组分为两个亚组，用 Hedström 锉或 R-Endo 器械去除材料。记录到达工作长度和消除填充材料所需的时间。使用扫描电子显微镜检查根管壁，以评估每三分之一的材料残留情况。根据评分标准测量材料的存在情况。使用 Student's t 检验确定时间和剩余材料的平均值之间是否存在显著差异（P < 0.05）。
在第三部分、材料或去除技术方面，残留的填充物碎屑没有显著差异（P > 0.05）。然而，与 Hedström 锉相比，R-Endo 到达工作长度和去除填充物的时间更短（P < 0.0001）。
两种器械技术都在根管内留下了填充物，主要是在根尖三分之一处。两种器械技术之间没有差异。
