Yguel-Henry S, Vannesson H, von Stebut J
Nancy University, School of Dental Surgery.
J Endod. 1990 Sep;16(9):418-22. doi: 10.1016/S0099-2399(06)81883-2.
A high precision method is presented for measurement of root canal instrument cutting efficiency in pure, linear movements. Operator-independent instrumentation is achieved by means of an automatic, mechanical test rig mounted as an accessory in an Instron tensile testing machine. It is now possible to do reliable cutting simulation that closely represents clinical motions. Cutting efficiency is assessed via "wear" volume measurement by means of three-dimensional surface mapping on bovine bone serving as a dentin substitute. A volume precision of 3 x 10(-3) mm3 is achieved which is equivalent to a weight resolution better than 10 micrograms. In particular, cutting efficiency data for K-type and H-type files is presented showing an enhanced performance (by roughly a factor of 3) in the latter case. Lubrication is also shown to increase the cutting efficiency (+200% for the K file and +30% for the H file). Water and 2.5% sodium hypochlorite solutions have equivalent effects.
本文介绍了一种高精度方法，用于测量根管器械在纯线性运动中的切割效率。通过将自动机械试验台作为附件安装在英斯特朗拉伸试验机中，实现了与操作员无关的器械操作。现在可以进行可靠的切割模拟，该模拟能紧密代表临床运动。通过在用作牙本质替代物的牛骨上进行三维表面映射，通过“磨损”体积测量来评估切割效率。实现了3×10(-3)立方毫米的体积精度，这相当于优于10微克的重量分辨率。特别是，给出了K型和H型锉的切割效率数据，显示出后者性能有所提高（大约提高了3倍）。还表明润滑可提高切割效率（K锉提高200%，H锉提高30%）。水和2.5%次氯酸钠溶液具有同等效果。
