Lam T V, Lewis D J, Atkins D R, Macfarlane R H, Clarkson R M, Whitehead M G, Brockhurst P J, Moule A J
Department of Dentistry, University of Queensland.
Aust Dent J. 1999 Mar;44(1):12-9. doi: 10.1111/j.1834-7819.1999.tb00530.x.
The purpose of this project was to observe the amount of apical and mid-curve transportation produced by a range of nickel titanium (NiTi), titanium alloy and stainless steel (SS) files. Tests were carried out in simulated curved root canals produced in epoxy resin blocks. Seven commercially available file types were tested using sizes 15 to 40. Instrumentation was carried out to 1 mm beyond the apex. Changes in canal dimensions were measured at 10x magnification under a shadowgraph. There were substantial differences in the amount and the pattern of apical and mid-curve transportation produced. The amount of transportation increased with each subsequent size of file. Under the same conditions, nickel titanium files produced significantly less transportation than stainless steel files. The least apical transportation was obtained with the NiTi Mity Turbo and the most by the SS K file and SS Hedstrom file. The least mid-curve transportation was produced by the NiTi Mity Turbo and the most by the SS Hedstrom file.
本项目的目的是观察一系列镍钛（NiTi）、钛合金和不锈钢（SS）锉所产生的根尖和根管中份弯曲处偏移量。测试在环氧树脂块中模拟的弯曲根管中进行。使用15至40号规格对七种市售锉类型进行测试。预备至根尖外1毫米处。在阴影图下以10倍放大率测量根管尺寸的变化。所产生的根尖和根管中份弯曲处偏移量及模式存在显著差异。随着锉的尺寸依次增大，偏移量增加。在相同条件下，镍钛锉产生的偏移量明显少于不锈钢锉。NiTi Mity Turbo锉产生的根尖偏移量最少，而SS K锉和SS Hedstrom锉产生的最多。NiTi Mity Turbo锉产生的根管中份弯曲处偏移量最少，而SS Hedstrom锉产生的最多。
