Schäfer E, Zapke K
Poliklinik für Zahnerhaltung, Münster, Germany.
J Endod. 2000 Nov;26(11):660-4. doi: 10.1097/00004770-200011000-00007.
The cleaning effectiveness of automated and manual root canal instrumentation was investigated with the aid of a scanning electron microscope. Hand instrumentation was performed with K-Flexofiles used in a reaming working motion and according to the step-back technique and with Hedstrom files used in a filing motion. Automated preparation was performed with the KaVo-Endo Flash device featuring torque-limited rotation using K-Flexofiles, as well as with the mechanical ProFile system using rotary nickel-titanium instruments. Twelve teeth each with either straight or curved root canals were instrumented to size 40. After cracking the roots longitudinally (n = 120), the amount of debris and smear layer were quantified on the basis of a numerical evaluation scale (1 through 5). Comparison of manual instrumentation with the automated KaVo-Endo Flash resulted in an equivalent degree of canal cleaning. Complete cleanliness was not achieved by any of the techniques and devices investigated. Best instrumentation results, especially in curved canals, were obtained with rotary ProFile instruments.
借助扫描电子显微镜研究了自动和手动根管预备的清洁效果。手动预备使用K-Flex锉以扩锉工作动作并按照逐步后退技术进行，以及使用Hedstrom锉以锉削动作进行。自动预备使用具有扭矩限制旋转功能的KaVo-Endo Flash装置并搭配K-Flex锉进行，以及使用机械ProFile系统搭配旋转镍钛器械进行。将12颗具有直根管或弯根管的牙齿预备到40号尺寸。在将牙根纵向劈开（n = 120）后，根据数字评估量表（1至5）对碎屑和玷污层的量进行量化。手动预备与自动KaVo-Endo Flash的比较显示根管清洁程度相当。所研究的任何技术和器械均未实现完全清洁。使用旋转ProFile器械获得了最佳的预备效果，尤其是在弯曲根管中。
