Lumley P J, Walmsley A D, Harrington E, Marquis P M
School of Dentistry, University of Birmingham, England.
Endod Dent Traumatol. 1993 Aug;9(4):153-6. doi: 10.1111/j.1600-9657.1993.tb00266.x.
An in vitro model system was developed to investigate the stroke rate and loading during hand, sonic, or ultrasonic instrumentation. The model system consisted of a mandibular molar tooth attached to a strain gauge and interface to a computer. Ten clinicians instrumented the distal canal of lower molar teeth. Stroke rates used and loads applied were measured using different sized files with the three different preparation techniques. There was no significant difference in stroke rates between different file sizes (p > 0.05) within the same generator, however, stroke rate for hand was significantly slower than for sonic or ultrasonic (p < 0.01). Loading of the canal wall rose with increase in file size which was significant for hand (p < 0.01) and sonic (p < 0.05) but not ultrasonic (p > 0.05). There was a tendency for loading to be higher with hand instrumentation, this however was not significant (p > 0.05).
开发了一种体外模型系统，以研究手动、声波或超声波器械操作过程中的冲程率和负载情况。该模型系统由一颗与应变仪相连并与计算机连接的下颌磨牙组成。十名临床医生对下颌磨牙的远中根管进行器械操作。使用三种不同的预备技术，用不同尺寸的锉测量所使用的冲程率和施加的负载。在同一发生器内，不同锉尺寸之间的冲程率没有显著差异（p>0.05），然而，手动操作的冲程率明显慢于声波或超声波操作（p<0.01）。根管壁的负载随着锉尺寸的增加而升高，这在手动操作中显著（p<0.01），在声波操作中显著（p<0.05），但在超声波操作中不显著（p>0.05）。手动器械操作时负载有更高的趋势，但这并不显著（p>0.05）。
