Yguel-Henry S, von Stebut J
J Endod. 1994 Aug;20(8):367-72. doi: 10.1016/S0099-2399(06)80292-X.
Cutting efficiency loss of #15 H-type and K-type files was studied as a function of bulk plastic deformation and cutting edge wear. Instrumentation was done by purely extractive filing, without any significant torsional and/or bending strain. Cutting efficiency variations were assessed by means of cutting force measurement, while absolute cutting efficiency was obtained through three-dimensional scanning stylus profilometry. Bulk plastic deformation-induced flute modifications may lower the cutting efficiency of H-type files by approximately 50%. For this instrument special care is required in tip and flute machining to avoid in vivo breakage. On the contrary, within the normal life-span of an instrument of approximately 100 strokes cutting edge wear is seen to be negligible. The existence of such wear is "inferred" indirectly from a 10% drop in extraction efficiency.
研究了15号H型和K型锉的切削效率损失与体积塑性变形和切削刃磨损的关系。通过纯抽拉锉削进行测量，不产生任何显著的扭转和/或弯曲应变。通过测量切削力评估切削效率变化，而绝对切削效率则通过三维扫描触针轮廓仪获得。体积塑性变形引起的凹槽变化可能会使H型锉的切削效率降低约50%。对于这种器械，在尖端和凹槽加工时需要特别小心，以避免体内折断。相反，在器械约100次行程的正常使用寿命内，切削刃磨损可忽略不计。这种磨损的存在是从抽拉效率下降10%间接“推断”出来的。
