桥基牙倾斜对牙周组织影响的有限元研究

Action of Abutment Tilted on the Periodontical Ligament:3-D Finite Element

为了考察桥基牙倾斜对牙周组织应力分布的影响,相对曲面实体造型技术,将基于三角剖分的网格实体建模方法应用于固定桥及牙周组织的三维生物模型;同时借助三维有限元,对0°、12°、18°、24°、30°不同基牙倾斜角度的牙周膜,在3种典型咀嚼载荷下的应力状态进行了对比．结果表明,基牙倾斜角度变化对未倾斜基牙受力影响微弱,但对本身的应力极值及分布状态都有较大改变,特别是倾斜24°时应力极值达到最大,而应力集中的现象也加重．

This paper conducts a three-dimensional finite element analysis of stress distribution of the periodontical ligament as abutment tilts. Comparing with surface solid modeling method, mesh modeling technology is applied to reconstruction of fixed partial denture and periodontal tissues. Through this method, comparability of model with really biologic model has been proved and models of different tilted angles can be easily derived from the model constructed first. To investigate the stress distribution of periodontical ligament on different tilted angle of abutments by using three-dimensional finite element method, four team of models are constructed when tiled abutments is 0 degree, 12 degrees, 18 degrees, 24 degrees and 30 degrees separately. Meanwhile three types of occlusal forces are loaded respectively and the following conclusions were drawn： 1 ） Varieties of tilted angle in the same loadcase have small influence on stress distribution of non-tiled pre-molar; 2） For tiled molar, stress value of periodontical ligament is the biggest when the tiled angle is 24°; 3） Stress concentration is more remarkable on periodontical ligament of molar when tiled angle increases.