Schäfer Edgar
Poliklinik für Zahnerhaltung, Münster, Germany.
J Endod. 2002 Dec;28(12):800-2. doi: 10.1097/00004770-200212000-00002.
The purpose of this study was to investigate possible changes in cutting efficiency of nickel-titanium K-files that had undergone physical vapor deposition coating. Titanium nitride coatings were deposited using different process parameters. A total of 84 nickel-titanium K-files (size 35) were randomly divided into 7 groups of 12 instruments each. Groups A to F (experimental): instruments were coated with titanium nitride using different process parameters regarding substrate temperature, applied voltage, coating thickness, and ion bombardment. Group K (control): samples were not coated with titanium nitride. The cutting efficiency of all instruments was determined in a rotary working motion by means of a computer-driven testing device. Special plastic samples with a cylindrical canal were used, and the maximum penetration depth of the instruments into the lumen was the criterion for cutting efficiency. Instruments of groups A, F, and C achieved significantly greater penetration depths than the uncoated instruments of the control group (p < 0.05). Cutting efficiency of physical vapor deposition-coated nickel-titanium files was increased by up to 26.2% in comparison with uncoated instruments.
本研究的目的是调查经过物理气相沉积涂层处理的镍钛K锉的切割效率可能发生的变化。使用不同的工艺参数沉积氮化钛涂层。总共84根镍钛K锉（35号）被随机分为7组，每组12根器械。A至F组（实验组）：使用关于基底温度、施加电压、涂层厚度和离子轰击的不同工艺参数，对器械进行氮化钛涂层处理。K组（对照组）：样本未进行氮化钛涂层处理。通过计算机驱动的测试装置，以旋转工作运动的方式测定所有器械的切割效率。使用带有圆柱形管腔的特殊塑料样本，器械进入管腔的最大穿透深度作为切割效率的标准。A组、F组和C组的器械比对照组未涂层的器械达到了显著更深的穿透深度（p < 0.05）。与未涂层的器械相比，物理气相沉积涂层的镍钛锉的切割效率提高了26.2%。
