摘要
目的了解在不同状态相同载荷条件下健康人上颌骨复合体的应力分布情况,探讨其生物力学行为。方法利用三维有限元模型和 ANSYS 软件模拟张口位和正中咬合时上颌骨复合体的边界条件,在双侧上颌第一磨牙的功能尖及中央窝节点上分别加载100 N 平行于 Z 轴的集中压力,计算并分析上颌骨复合体的应力。结果在正中咬合和张口位时双侧第一磨牙均受垂直向集中压力作用时,正常上颌骨复合体各部位应力值均较小且大小不相等,正中咬合时等效应力最大值(6.497 N,位于咬肌附丽处)小于张口位(8.969 N,位于左侧颧骨额蝶突)。结论上颌骨复合体具有使集中压力分散的作用,其中口颌肌系统发挥重要的协调、平衡作用。
Objective To investigate the changes of stress distribution in the normal maxillary complex under different conditions and explore the feature of biomechanical reaction. Methods A threedimensional finite element stress analysis has been used to investigate the characters of stress distribution at open-mouth position and in centric occlusion. Results Under the same load, the stresses of the same region in the normal maxillary complex were distributed unequally. The limits of stress at open-mouth position （8. 969 N） were wider than that in centric occlusion （6. 497 N）. Conclusions The stress of the whole maxillary complex in centric occlusion was lower than that at open-mouth position because of the different state of jugomaxillary muscle. This indicated that the effect of muscles needed to be considered in the study of maxillary complex biomechanics.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2007年第11期687-689,共3页
Chinese Journal of Stomatology
关键词
生物力学
三维有限元
上颌骨
Biomechanics
Three-dimensional finite element
Maxilla
