Department of Orthodontics, School of Dentistry, Aichi-Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya-shi, Aichi-ken 464-8651, Japan.
Dent Mater J. 2013;32(3):462-7. doi: 10.4012/dmj.2012-118.
β-titanium alloy is frequently used in nickel-free orthodontic wires for patients with a metal allergy. However, the Young's modulus of β-titanium alloy wires is lower than that of Co-Cr-Ni alloys, causing loss of anchorage and failure to prevent unwanted tooth movements. To improve its mechanical properties for use in anchorage appliances such as transpalatal arches, Ti-6Mo-4Sn alloy wire was heat-treated at 300, 400, 500 and 600 °C for 5 min, 30 min, and 4 h in this study. Tensile testing revealed that the wire heated at 500 °C/30 min had a Young's modulus of 75 GPa and a tensile strength of 1,650 MPa - the highest among all the heat treatment groups. Therefore, Ti-6Mo-4Sn alloy wire heat-treated at 500 °C/30 min yielded mechanical properties approximating those of wires currently used for retainers and transpalatal arches.
β-钛合金常用于对金属过敏的患者的无镍正畸丝中。然而，β-钛合金丝的杨氏模量低于 Co-Cr-Ni 合金，导致固位力丧失和无法防止牙齿的不良移动。为了提高其在诸如腭弓等支抗装置中的机械性能，本研究中将 Ti-6Mo-4Sn 合金丝在 300、400、500 和 600°C 下分别加热 5 分钟、30 分钟和 4 小时。拉伸测试表明，在 500°C/30 分钟下加热的丝具有 75GPa 的杨氏模量和 1650MPa 的拉伸强度——在所有热处理组中最高。因此，在 500°C/30 分钟下热处理的 Ti-6Mo-4Sn 合金丝产生的机械性能接近目前用于保持器和腭弓的丝。
