大鼠磨牙三维有限元模型的建立

目的 :建立大鼠磨牙的三维有限元模型 ,探讨牙及牙周组织的应力分布状况。方法 :采用Sprague Dawley大鼠 2 0只 ,建立大鼠磨牙正畸移动的动物模型 ,制作大鼠上颌第一磨牙牙周连续切片 ;采用计算机技术 ,重建牙及牙周组织三维形态、结构 ,并建立其三维有限元模型。结果 :组织切片的应力分布显示牙周膜是一种存在于两种硬组织之间的软组织 ,有其特有的应力分布状态。结论 :本研究建立的正畸大鼠磨牙三维有限元模型是观察正畸牙移动过程中分析应力的一种简便、准确、可靠的模型及方法。

Construction of three dimensional finite element model of rat molar

Objective: This paper was to construct three dimensional finite element model of rat molar, and to access mechanical stress distribution in the tooth and periodontia. Methods: The first maxillary molar of adult rat was moved for 2 weeks with initial force of 40 g and 100 g. The histological specimen of tooth and surrounding structures were sectioned serially at 4?μm thick slices in the coronary direction. The section’s microscopic photographic images were made every 140?μm. The structural information of images was traced and fed into computer for three dimensional reconstruction of the structure and finite element model. Results: The stress distribution in periodontia which lies between tooth and alveolar bone was very complicated. Conclusion: The three dimensional finite element model of rat molar is simple, precise, and effective for analyzing stress in tooth and periodontia.