Gil F J, Planell J A
Department of Materials Science and Metallurgical Engineering, Universitat Politécnica Catalunya, Diagonal 647, 08028 Barcelona, Spain.
J Biomed Mater Res. 1999;48(5):682-8. doi: 10.1002/(sici)1097-4636(1999)48:5<682::aid-jbm12>3.0.co;2-m.
Transformation temperatures and mechanical properties such as transformation stresses at different temperatures, superelasticity characteristics, and load cycling behavior have been investigated in NiTiCu orthodontic archwires with various copper concentrations. The results have been compared with the conventional NiTi orthodontic archwires. The addition of copper was effective in narrowing the stress hysteresis and in stabilizing the superelasticity characteristics against cyclic deformation, with the result that the slope of the load-deflection unloading curve of the alloy is lower than NiTi. Moreover, it produced greater stability of both the transformation temperature and the force applied to the teeth for a determined design and wire cross-section. On the other hand, the presence of copper in NiTi orthodontic archwires reduced the ageing effect. Studies of ion release in artificial saliva showed only small quantities after long periods of immersion.
对具有不同铜浓度的镍钛铜正畸弓丝的转变温度以及诸如不同温度下的转变应力、超弹性特性和载荷循环行为等力学性能进行了研究。已将结果与传统镍钛正畸弓丝进行了比较。添加铜有效地缩小了应力滞后，并稳定了超弹性特性以抵抗循环变形，结果是该合金的载荷 - 挠度卸载曲线的斜率低于镍钛合金。此外，对于确定的设计和钢丝横截面，它使转变温度和施加于牙齿的力都具有更高的稳定性。另一方面，镍钛正畸弓丝中铜的存在降低了时效效应。在人工唾液中的离子释放研究表明，长时间浸泡后仅释放少量离子。
