Cheung G S, Chan A W
Department of Conservative Dentistry, University of Hong Kong.
J Endod. 1996 Mar;22(3):131-4. doi: 10.1016/S0099-2399(96)80289-5.
Root canal preparation may be the most technique-sensitive and labor-intensive procedure in endodontic therapy. Many automatic handpieces and machine-driven devices have been marketed to expedite this procedure. Excalibur is one such handpiece. The purpose of this study was to compare the Excalibur hand piece with traditional K-files for their effectiveness in shaping curved root canals. A total of 24 standardized canals in extracted human mandibular molars were randomly divided into two groups. They were instrumented either with Excalibur according to the manufacturer's instructions or manually using the step-down technique. The cross-sectional shapes of the root canal at the apical, midroot, and coronal levels were digitized before and after instrumentation. Image analyzer software was used to compare the images. The results showed that the methods removed similar amount of dentin at all three levels. Although the Excalibur handpiece had a slight tendency to straighten the canal more than hand instrumentation, the difference was not significant. Strip-perforation occurred in three specimens in the Excalibur group, but none in the manual group. There was no separation of instrument throughout the experiment.
根管预备可能是牙髓治疗中技术敏感性最高且劳动强度最大的操作。许多自动手机和机器驱动装置已投放市场以加快该操作进程。Excalibur就是这样一种手机。本研究的目的是比较Excalibur手机与传统K锉在弯曲根管塑形方面的有效性。在拔除的人类下颌磨牙中选取24个标准化根管，随机分为两组。一组按照制造商说明使用Excalibur进行预备，另一组采用逐步后退技术手动预备。在预备前后对根管根尖、根中和冠部水平的横截面形状进行数字化处理。使用图像分析软件比较图像。结果显示，两种方法在所有三个水平去除的牙本质量相似。尽管Excalibur手机比手动器械预备使根管更有轻微的变直趋势，但差异不显著。Excalibur组有3个标本出现条形穿孔，而手动组无穿孔。在整个实验过程中器械均未分离。
