基于有限元仿真的形状记忆聚合物弓丝初始正畸力分析

发布时间：2018-03-01 18:32

本文关键词： 正畸力形状记忆聚合物(SMP) 有限元弓丝　出处：《中国生物医学工程学报》2016年02期 　论文类型：期刊论文

【摘要】：正畸治疗过程中,临床常用镍钛金属弓丝对人体存在潜在的毒性作用,且缺乏美观性;相比之下形状记忆聚合物(SMP)材料因其良好的力学性能、易成形、美观性,在正畸中受到越来越多的重视。而形状记忆聚氨酯(SMPU)作为一种典型的SMP材料,其在正畸治疗效果方面的研究尚不充分,所能提供的矫治力大小有待进一步探究。在正畸矫治力研究中,临床口内检测非常困难,有限元分析技术是目前最主要的研究手段。针对上述问题,基于Tobushi一维SMP本构方程,参照粘弹性材料标准线性模型构建了SMP材料的三维本构方程,并利用FORTRAN语言编写了可用ABAQUS调用的UMAT子程序;参照正畸临床数据,利用三维建模软件建立了包括牙齿、托槽、弓丝在内的三维有限元模型,以侧切牙、尖牙为研究对象,通过对弓丝施加不同形式的变形,得出SMPU弓丝形变量为3 mm时产生的初始正畸力大小为0.06~0.55 N。结果表明,SMPU弓丝提供的初始正畸力与临床认为的最佳正畸力相比略为偏小,适合正畸治疗的第一阶段;但SMPU材料的力学性能还有进一步提升改善的空间,在正畸领域具有较高的潜在应用价值。
[Abstract]:During orthodontic treatment, the Ni-Ti metal arch wire has potential toxicity to human body, and it lacks beauty, compared with shape memory polymer (SMPP) material because of its good mechanical properties, easy to form and beautiful. More and more attention has been paid to orthodontics. As a typical SMP material, shape memory polyurethane (SMPU) has not been studied enough in orthodontic treatment. In the study of orthodontic force, clinical intraoral detection is very difficult, and finite element analysis is the most important research method. In view of the above problems, based on the Tobushi one-dimensional SMP constitutive equation, According to the standard linear model of viscoelastic material, the three-dimensional constitutive equation of SMP material is constructed, and the UMAT subprogram which can be called by ABAQUS is written by FORTRAN language, and the teeth and brackets are built by referring to the clinical data of orthodontics. Three dimensional finite element model including arch wire is used to study the lateral incisor and canine teeth, and different forms of deformation are applied to the arch wire. The results showed that the initial orthodontic force provided by SMPU arch wire was slightly smaller than that of the optimal orthodontic force, which was suitable for the first stage of orthodontic treatment. However, the mechanical properties of SMPU materials still have room for further improvement, and have high potential application value in orthodontic field.
【作者单位】：浙江工业大学特种装备制造与先进加工技术教育部重点实验室;浙江工业大学材料科学与工程学院;
【基金】：国家自然科学基金(51375453) 浙江省自然科学基金(LY13E050017)
【分类号】：R783.5

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