传动直丝弓矫治器三维有限元模型的建立

背景：随着现代矫治技术的发展, 发明一种高效的矫治器,一直是正畸学者们的研究热点。传动直丝弓矫治器就是在这种大环境下应运而生,能快速打开咬合和缩短疗程,但前对主弓丝后段宽度与后倾弯角度之间的关系的研究均不深入。目的：建立生物相似性和力学相似性较高的传动直丝弓矫治器的三维有限元模型,获得弓丝后段宽度和后倾弯大小之间的关系。方法：使用 64 排螺旋 CT 扫描,得到 1 例安氏Ⅱ类 1 分类的志愿者上颌牙列、上颌骨截面的 DICOM 格式的影像数据。采用 Ansys workbench 13.0 软件、Mimics 10.01 软件、Unigraphics NX 6.0 软件、GeomagicStudio8.0 软件相结合的方法,在 Windows XP Service Pack 3 系统中建立包括传动直丝弓矫治器、带环、澳丝、上颌骨、上颌牙齿及牙周膜的三维有限元模型。结果与结论：实验建立了由 250 929 个单元数,657 766 个节点组成的传动直丝弓矫治器的三维有限元模型,不仅具有高度的几何相似性和力学相似性,具有依据研究需要添加或删减组件,利于分析传动直丝弓矫治力学体系并指导临床应用和矫治器改良。

Establishment of a three-dimensional finite element model of transmission straight wire appliance

BACKGROUND： With the development of modern orthodontics, to invent an efficient appliance is the focus in recent studies. Transmission straight wire appliance was born on this background. This appliance can accelerate occlusion and shorten treatment duration. The relationship between distal width and angulation of gable bends of main arch wire needs to study in depth. OBJECTIVE： To establish three-dimensional finite element model of transmission straight wire appliance with better biological and mechanical similarity, and to obtain the reiaUonship between distal width and angulation of gable bend of main arch wire. METHODS： By using scanning of spiral CT with 64 rows, the sectional image data in DICOM format of maxillary dentition and maxillae of the volunteers （Class II, division 1） were obtained. With the help of Ansys workbench 13.0, Mimics 10.01, Unigraphics NX and Geomagic Studio 8.0 softwares, the three-dimensional finite element model including transmission straight wire appliance, bend, Australian Orthodontic Wire, maxillae, maxillary tooth and periodontal ligament was established in Windows XP Service Pack 3 system, RESULTS AND CONCLUSION： A three-dimensional finite element model of transmission straight wire appliance was established, which consisted of 250 929 elements and 657 766 nodes. Furthermore, three-dimensional finite element model had higher geometric similarity and mechanical similarity, as well as the advantages of adding or subtracting components according to the requirement of the research. The model was conductive to analyze themeGhanical system of transmission straight wire appliance and guide the clinical application and appliance modification.