Department of Biomaterials Science, Osaka University Graduate School of Dentistry.
Department of Orthodontics and Dentofacial Orthopedics, Osaka University Graduate School of Dentistry.
Dent Mater J. 2020 Jun 5;39(3):415-421. doi: 10.4012/dmj.2019-104. Epub 2019 Dec 11.
The aim of this study was to identify a physical property suitable for evaluating the orthodontic force by analyzing the physical properties of thermoplastic materials. Four thermoplastic materials were used: Essix A+ Plastic (EA), DURAN (DU), Erkodur (ER), and Essix C+ Plastic (EC). Finite element analysis (FEA), a water absorption test, constant strain loading test, X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy analysis were conducted. FEA found a significant correlation between the elastic modulus and the orthodontic force. The water absorption of EC was significantly smaller than the other materials. EC showed no elastic modulus change. The XRD pattern indicated that EC was a crystalline polymer. FEA of thermoplastics showed that the elastic modulus is suitable for the evaluation of orthodontic force. The crystalline thermoplastic EC demonstrated a stable elastic modulus even under strain in a wet environment, suggesting the advantage of its use as an orthodontic aligner material.
本研究旨在通过分析热塑性材料的物理特性，确定一种适合评估正畸力的物理特性。使用了四种热塑性材料：Essix A+ Plastic（EA）、DURAN（DU）、Erokodur（ER）和 Essix C+ Plastic（EC）。进行了有限元分析（FEA）、吸水率测试、恒应变加载测试、X 射线衍射（XRD）和傅里叶变换红外光谱分析。FEA 发现弹性模量与正畸力之间存在显著相关性。EC 的吸水率明显小于其他材料。EC 没有表现出弹性模量的变化。XRD 图谱表明 EC 是一种结晶性聚合物。热塑性塑料的 FEA 表明弹性模量适合评估正畸力。结晶热塑性 EC 在湿环境下应变下表现出稳定的弹性模量，表明其作为正畸保持器材料的优势。
