摘要
目的使用三维有限元模型分析4种不同底层冠设计的3单位固定桥中界面应力分布情况。方法建立三维上颌第二前磨牙缺失3单位固定桥有限元模型,并进行4种不同底层冠设计。在桥体上施加600N的垂直方向静荷载,以模拟最大咬合力。使用有限元分析不同设计的应力分布。结果Ⅰ型设计的最大拉应力在面和龈端的饰瓷和底层冠交界处集中。Ⅱ型设计的最大拉应力在面的饰瓷和底层冠交界处集中,龈端应力集中于桥体底部。Ⅲ型设计和Ⅳ型设计的拉应力分散于桥体底部。结论随着饰瓷包被面积减少,最大拉应力趋于从饰瓷和底层冠交界处向桥体和连接体底部分散。
Objective To use 3-dimensional finite element modeling to simulate stresses at the in- terface of 3-unit posterior fixed partial dentures （FPDs） made with 4 different framework designs. Meth- ods A 3-unit FPD was digitized and used to create 3-dimensional models of 4 framework preparation con- figurations. A load of 600 N was applied at the central point of the pontic＇s occlusion surface. The stress values of 4 framework designs were calculated by finite element analysis. Results Tensile stress of Type I design was maximal at the occlusal and gingival veneer-core interfaces. Tensile stress of Type [[ design was maximal at the occlusal veneer-core interface. Tensile stresses of Type HI and Type IV de- sign extended in the bottom of pontic. Conclusion In general, the maximal tensile stresses of veneer- core interface extend in the bottom of pontic and connecters as the veneer area was decreased.
出处
《福建医科大学学报》
2013年第4期236-239,共4页
Journal of Fujian Medical University
关键词
有限元分析
训练义齿固位
模型
解剖学
牙瓷料
氧
元素
锆
义齿
局部
固定
应力
物理
finite element analysis
denture retention~ models, anatomic~ dental porcelain~ oxy-gen~ elements~ Zirconium~ denture, partial, fixed~ stress, mechanical
