用于分析面形态与颞下颌关节生物力学关系的三维有限元模型的建立

Establishment of Three-dimensional FEM Model for Evaluation of Biomechanical Relationship between Temporomadibular Joint Morphology and Bilateral Condyles

目的为研究牙合面形态变化对颞下颌关节应力影响的规律,建立包括下颌牙列牙合面形态及双侧髁突的三维有限元模型。方法尸头1具,平行于眶耳平面作CT扫描,获取下颌骨几何参数;取石膏模型,以三维扫描仪对牙列牙合面扫描(精度0.5mm);将石膏模型参数与CT参数换算到同一坐标系下,在髁突上方设均厚类关节盘,关节盘顶及下颌角作约束设计,经划分网格生成有限元模型。结果建立了包括双侧髁突、类关节盘及下颌牙列在内的用于分析咬合与颞下颌关节关系的三维有限元模型。结论采用本方法可建立研究牙合面形态与颞下颌关节应力关系的三维有限元模型。

Objective To reconstruct three-dimensional finite element method models (FEM), including FEM for lower dentition and bilateral condyles for analyzing the characteristics of temporomandibular joint (TMJ) stress distribution result from alteration of dental occlusion . Methods A human cadaveric skull was used for CT scan at the plane parallel to the Frankfort Horizontal plane. Geometrical information of mandibular CT images was extracted for preparation of being imported into software. Occlusion surface of its plaster casts was then scanned in a 3D fashion (accuracy:0.5mm). The related parameters of both cast and CT images were converted into a coordinate system. A simulated disc was added on each of the condyles. Constraints were applied to the upper surface of the disc and the mandibular angle. Results After meshing the FEM containing bilateral condyles?simulated discs, and lower dentition was established. Conclusion By using the methods developed for this study, the FEM was established to study the result of TMJ stress distribution and its alterations accompanied with changes in occlusion.