MDCT在建立种植体支抗滑动关闭拔牙间隙三维有限元模型中的应用

目的 探讨利用多层螺旋CT(MDCT)建立种植体支抗滑动关闭拔牙间隙三维有限元模型的方法.方法 选择一副全口标准下颌仿真牙,按正常牙弓的基本要求进行排牙,排牙完成后从下颌牙列中去除第一前磨牙.使用美国GE公司Lightspeed16排螺旋CT机扫描仿真牙,采集容积数据.扫描层厚0.625 mm、层间隔0.625 mm、重建间隔0.3mm,应用Dicom标准和Mimics、UG、Geomagic studio等软件,再结合ANSYS三维有限元专用软件对下颌牙CT断层影像进行分析处理,建立三维有限元模型.结果 获得了140层下颌仿真牙的多排螺旋CT扫描断层影像数据,利用所得数据建立了258834个节点、420016个单元的带有种植体支抗的拔除两侧第一前磨牙的下牙颌组织三维有限元模型.结论 利用多层螺旋CT扫描数据建立种植体支抗滑动关闭拔牙间隙三维有限元模型,可缩短建模时间、提高建模效率和模型的精度.该模型的建立为在不同加载方式下种植体支抗滑动关闭拔牙间隙的应力分析提供初步基础.

Application of multi-detector computer tomography in establishing a finite element model of sliding mechanics in space-closing with implant anchorage

Objective To evaluate the value of multiple detector computer tomography (MDCT) in establishing a finite element model of sliding mechanics in space-closing with implant anchorage. Methods A normally arrayed mandibular teeth model was removed with the first premolar. Then it was scanned by MDCT to get original databases. All the databases were dealed with DICOM standard, Mimics, UG, Geomagic studio software and analyzed with ANSYS software to finally establish a finite element model of sliding mechanics. Results One hundred and forty images were obtained with MDCT. Three-dimension finite element model of sliding mechanics in space-closing with implant anchorage was constructed with 258834 nodal points and 420016 units. Conclusion It was more efficient and precise to get the databases with MDCT to make the three-dimension finite element model and this model could be used for the analysis of the stress distribution of sliding mechanics in space-closing with implant anchorage under different loading conditions.