Naveau Adrien, Chesneau Jonathan, Barquins Michel, Pierrisnard Laurent
Hopital Bretonneau, Paris Descartes University, Paris, France.
Eur J Prosthodont Restor Dent. 2009 Dec;17(4):157-63.
This three-dimensional finite element analysis first described stresses distribution in loaded posterior fixed partial dentures, then compared the influences of bone height, abutment roots number and pontic length on their displacements. Twelve mandibular (three to five unit) FDPs integrating periodontal ligaments were designed. Stresses were localized in connectors and cervical areas of abutments near the edentulous span. The main FDPs' displacements consisted of vertical translation increasing with low bone height. FDPs underwent simultaneously an anteroposterior displacement (about ten times smaller) towards the weakest abutment side. Splinted abutments affected this anteroposterior displacement. Span length was associated with small beam deflection.
这项三维有限元分析首先描述了加载后的后牙固定局部义齿中的应力分布，然后比较了骨高度、基牙根数目和桥体长度对其位移的影响。设计了12个整合牙周韧带的下颌（三至五单位）固定局部义齿。应力集中在无牙间隙附近基牙的连接体和颈部区域。固定局部义齿的主要位移包括随着骨高度降低而增加的垂直平移。固定局部义齿同时朝着最弱基牙侧发生前后位移（约小十倍）。夹板式基牙影响这种前后位移。跨度长度与小梁挠度有关。
