CENIMAT/I3N, Materials Science Department, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica, Portugal; CEMMPRE, Mechanical Engineering Department, University of Coimbra, Coimbra, Portugal.
CENIMAT/I3N, Materials Science Department, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica, Portugal.
J Mech Behav Biomed Mater. 2020 Jul;107:103747. doi: 10.1016/j.jmbbm.2020.103747. Epub 2020 Apr 4.
Functionally graded NiTi orthodontic archwire was tested to assess the evolution of the actuation force as a function of the temperature. Varying actuation forces on the same orthodontic wire allow the optimization of repositioning of the different types of teeth, according its radicular support. The wire was separated into three segments: Incisive, Premolar and Molar. The functionally graded NiTi orthodontic archwire segments have distinct structural and mechanical behavior as confirmed by differential scanning calorimetry, synchrotron-based X-ray diffraction, and thermomechanical analysis. The mechanical behavior was analyzed by three-point bending tests at four different temperatures (5, 20, 25 and 37 °C). In parallel, three-point bending tests were performed by TMA analysis in a temperature range from 5 °C (from cold water) to 40 °C (hot meal). This study showed the comparison of the different segments on the same archwire, providing a better understanding of the behavior of these functionally graded materials.
对功能梯度 NiTi 正畸弓丝进行了测试，以评估作为温度函数的驱动力的演变。同一正畸丝上不同的驱动力可根据不同类型牙齿的根尖支持情况优化其重新定位。将弓丝分为三个部分：切牙、前磨牙和磨牙。功能梯度 NiTi 正畸弓丝段具有不同的结构和力学性能，这一点通过差示扫描量热法、基于同步加速器的 X 射线衍射和热机械分析得到了证实。通过在四个不同温度（5、20、25 和 37°C）下进行三点弯曲测试来分析力学性能。同时，通过 TMA 分析在 5°C（冷水）至 40°C（热餐）的温度范围内进行三点弯曲测试。这项研究比较了同一弓丝上的不同部分，更好地了解了这些功能梯度材料的行为。
