Devall R, Lumley P J, Waplington M, Blunt L
School of Manufacturing and Mechanical Engineering, University of Birmingham, England.
Endod Dent Traumatol. 1996 Apr;12(2):96-9. doi: 10.1111/j.1600-9657.1996.tb00104.x.
The aim of this study was to investigate the cutting ability of retro tips powered by a sonic handpiece (MM 1500, Micro Mega, Prodonta, Geneva, Switzerland). Two levels of the following variables were evaluated in this study: a) power setting with the an inlet ring half or fully open, b) orientation of tip perpendicular or parallel to the long axis of the handpiece, c) length of tip 2 or 3 min, d) loading of 25 or 50 grams, e) tip size 35 or 55. The substrate used was 1 mm thick sections of bovine bone and load was controlled by using a load cell interfaced with a transducer meter. Instrumentation time was fixed at 10 seconds with water irrigation. A 2(5) full factorial analysis was performed with two replications making a total of 64 experimental units. The resultant depth of cut was measured using a stereo microscope at x50 magnification. Analysis of the data indicated that all variables had a significant effect on cutting (ANOVA p < 0.05). The most significant factor was power, followed by tip length tip orientation, width and load. An increase in loading resulted in tip constraint and a reduction of cutting at the lower power setting. In conclusion sonically activated retro tips were found to cut satisfactorily with instrument air inlet ring opening/power having the main effect.
本研究的目的是调查由声波手机（MM 1500，Micro Mega，Prodonta，瑞士日内瓦）驱动的倒锥钻的切割能力。本研究评估了以下变量的两个水平：a）进气环半开或全开时的功率设置，b）钻针与手机长轴垂直或平行的方向，c）钻针长度2或3 mm，d）负载25或50克，e）钻针尺寸35或55。所用的基质是1 mm厚的牛骨切片，通过与传感器仪表连接的测力传感器控制负载。用水冲洗时，操作时间固定为10秒。进行了2（5）全因子分析，重复两次，共64个实验单元。使用放大50倍的立体显微镜测量最终的切割深度。数据分析表明，所有变量对切割均有显著影响（方差分析p <0.05）。最显著的因素是功率，其次是钻针长度、钻针方向、宽度和负载。负载增加会导致钻针受限，并在较低功率设置下切割减少。总之，发现声波激活的倒锥钻在仪器进气环开口/功率起主要作用的情况下切割效果令人满意。
