Meling T R, Odegaard J
Department of Maxillofacial Surgery, Ullevaal Hospital, Oslo, Norway.
Am J Orthod Dentofacial Orthop. 1998 May;113(5):546-57.
Twenty-five rectangular superelastic or conventional work-hardened nickel-titanium alloy wires, commonly used in the 0.018-inch edgewise technique, supplied by seven different manufacturers, along with one braided nickel-titanium and two beta-titanium wires, were studied with respect to wire dimensions, edge bevel, and mechanical properties in longitudinal torsion at 37 degrees C. The wires were twisted 25 degrees and studied in deactivation, simulating application of torque to an individual tooth. Standard Siamese brackets. with stated slot heights of 0.018 inches and measured slot heights of 0.0187 inches, were used. Most wires were within +/-0.0005 inches of the stated dimensions, but had more edge bevel than previously reported for stainless steel and chrome-cobalt alloy wires. Variations in wire dimensions and edge bevel led to variable torsional (third-order) clearance. The torsional stiffness varied among manufacturers within the various wire sizes, this being the result of differences in actual cross-sectional geometry and material properties. None of the tested wires exhibited superelastic properties under the current conditions, and only one wire had a superelastic tendency.
对由七个不同制造商提供的、常用于0.018英寸方丝弓技术的25根矩形超弹性或传统加工硬化镍钛合金丝，以及一根编织镍钛丝和两根β钛丝，进行了关于丝材尺寸、边缘斜角和在37摄氏度下纵向扭转时机械性能的研究。将这些丝扭转25度，并在去激活状态下进行研究，模拟对单个牙齿施加扭矩的情况。使用了标准的连体托槽，其标称槽高为0.018英寸，测量槽高为0.0187英寸。大多数丝材的尺寸在标称尺寸的±0.0005英寸范围内，但边缘斜角比先前报道的不锈钢和铬钴合金丝材更大。丝材尺寸和边缘斜角的变化导致了可变的扭转（三阶）间隙。在各种丝材尺寸中，扭转刚度因制造商而异，这是实际横截面几何形状和材料性能差异的结果。在当前条件下，没有一根测试丝材表现出超弹性性能，只有一根丝材有超弹性倾向。
