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  本文關(guān)鍵詞： 正畸力 形狀記憶聚合物(SMP) 有限元 弓絲　出處：《中國生物醫(yī)學(xué)工程學(xué)報》2016年02期 　論文類型：期刊論文

【摘要】：正畸治療過程中,臨床常用鎳鈦金屬弓絲對人體存在潛在的毒性作用,且缺乏美觀性;相比之下形狀記憶聚合物(SMP)材料因其良好的力學(xué)性能、易成形、美觀性,在正畸中受到越來越多的重視。而形狀記憶聚氨酯(SMPU)作為一種典型的SMP材料,其在正畸治療效果方面的研究尚不充分,所能提供的矯治力大小有待進一步探究。在正畸矯治力研究中,臨床口內(nèi)檢測非常困難,有限元分析技術(shù)是目前最主要的研究手段。針對上述問題,基于Tobushi一維SMP本構(gòu)方程,參照粘彈性材料標準線性模型構(gòu)建了SMP材料的三維本構(gòu)方程,并利用FORTRAN語言編寫了可用ABAQUS調(diào)用的UMAT子程序;參照正畸臨床數(shù)據(jù),利用三維建模軟件建立了包括牙齒、托槽、弓絲在內(nèi)的三維有限元模型,以側(cè)切牙、尖牙為研究對象,通過對弓絲施加不同形式的變形,得出SMPU弓絲形變量為3 mm時產(chǎn)生的初始正畸力大小為0.06~0.55 N。結(jié)果表明,SMPU弓絲提供的初始正畸力與臨床認為的最佳正畸力相比略為偏小,適合正畸治療的第一階段;但SMPU材料的力學(xué)性能還有進一步提升改善的空間,在正畸領(lǐng)域具有較高的潛在應(yīng)用價值。
[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.
【作者單位】： 浙江工業(yè)大學(xué)特種裝備制造與先進加工技術(shù)教育部重點實驗室;浙江工業(yè)大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(51375453) 浙江省自然科學(xué)基金(LY13E050017)
【分類號】：R783.5

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