Department of Oral and Maxillo-Facial Surgery, University of Naples 'Federico II,' Via Pansini 5, 80131 Naples, Italy.
J Biomater Appl. 2012 Mar;26(7):829-44. doi: 10.1177/0885328210388678. Epub 2011 Feb 22.
Orthodontic treatment is strongly dependent on the loads developed by metal wires, and the choice of an orthodontic archwire should be based on its mechanical performance. The desire of both orthodontists and engineers would be to predict the mechanical behavior of archwires. To this aim, Gum Metal (Toyota Central R&L Labs., Inc.), TMA (ORMCO), 35°C Copper NiTi (SDS ORMCO), Thermalloy Plus (Rocky Mountain), Nitinol SE (3M Unitek), and NiTi (SDS ORMCO) were tested according to dynamic mechanical analysis and differential scanning calorimetry. A model was also developed to predict the elastic modulus of superelastic wires. Results from experimental tests have highlighted that superelastic wires are very sensitive to temperature variations occurring in the oral environment, while the proposed model seems to be reliable to predict the Young's modulus allowing to correlate calorimetric and mechanical data. Furthermore, Gum Metal wire behaves as an elastic material with a very low Young's modulus, and it can be particularly useful for the initial stage of orthodontic treatments.
正畸治疗强烈依赖于金属丝产生的载荷，正畸弓丝的选择应基于其机械性能。正畸医生和工程师都希望能够预测弓丝的力学行为。为此，测试了 Gum Metal（丰田中央 R&D 实验室公司）、TMA（ORMCO）、35°C 铜镍钛（SDS ORMCO）、Thermalloy Plus（落基山）、Nitinol SE（3M Unitek）和 NiTi（SDS ORMCO），依据动态力学分析和差示扫描量热法。还开发了一个模型来预测超弹性丝的弹性模量。实验测试结果表明，超弹性丝对口腔环境中发生的温度变化非常敏感，而提出的模型似乎可以可靠地预测杨氏模量，从而可以关联量热和机械数据。此外，Gum Metal 丝表现为具有非常低杨氏模量的弹性材料，它在正畸治疗的初始阶段可能特别有用。
