Dynamic stress relaxation of orthodontic thermoplastic materials in a simulated oral environment
Dynamic stress relaxation of orthodontic thermoplastic materials in a simulated oral environment
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模拟口腔环境中正畸热塑性材料的动态应力松弛
DOI：
10.4012/dmj.2013-131
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发表时间：
2013-12-01
影响因子：
2.5
通讯作者：
Bai, Yuxing
中科院分区：
文献类型：
--
作者：
Fang, Dongyu;Zhang, Ning;Bai, Yuxing
机械性能对于筛选隐形矫正器的正畸热塑性材料至关重要。然而，之前的大多数研究都是在实验室条件下进行的，这限制了我们对口腔环境中矫正器机械行为的理解。在本研究中，我们结合 Bose ElectroForce 和自制温控水浴研究了热塑性材料的动态应力松弛。在37℃水浴以及周围大气环境（近似20℃）下测量了五种正畸热塑性材料的3小时应力松弛曲线。选择0、30、60、90、120、150和180分钟时的残余应力百分比进行统计分析。正如预期的那样，实验结果表明，所有五种材料内的残余应力随着时间的推移而减小，并且该过程在 37 ℃ 水浴中显着加速（p
Mechanical properties are crucial for screening orthodontic thermoplastic materials for invisible aligners. However, most of previous studies were carried out within laboratory conditions which limit our understanding of the mechanical behaviors of aligners within oral environment. In this study, we studied the dynamic stress relaxation of thermoplastic materials by combination of Bose ElectroForce and a homemade temperature-controlled water bath. The 3-h stress relaxation curves of five orthodontic thermoplastic materials were measured within 37 degrees C water bath as well as comparatively in ambient atmospheric environment (similar to 20 degrees C). The percentage residual stress at 0, 30, 60, 90, 120, 150, and 180 min was selected for statistical analyses. As expected, the experimental results showed that the residual stress within all five materials decreased with time, and that this process was significantly accelerated in the 37 degrees C water bath (p