不同冠根比例对根管壁应力影响的分析  

Analysis the Effect on the Stress of Wall of Root Canal by Different Proportion between Crown and Root

作　　者：洪瑾[1] 夏文薇[1] 熊焕国[2] 

机构地区：[1]上海第二医科大学附属第九人民医院口腔医学院口腔内科,上海200011 [2]上海第二工业大学机械工程系,上海200040

出　　处：《上海口腔医学》2002年第3期213-215,共3页Shanghai Journal of Stomatology

基　　金：上海市科学技术发展基金(984419669)

摘　　要：目的应用有限元法观察牙槽嵴高度改变与根管管壁应力变化的关系。方法在已建立的下颌第一磨牙实验模型上,模拟牙槽嵴高度降低1/4、1/3和1/2建立修改模型,并在修改模型上垂直和侧向加载,计算牙齿及根管壁各部位的最大能量应力。结果管壁各部应力变化的趋势与牙体各部应力变化趋势相似,但管壁应力小于牙体部应力。原模型与修改模型在根管口处的应力值接近,随之原模型的应力明显降低;而修改模型的应力在根上1/3处达到最大,且固定高度越低,产生的应力越大,应力下降也越缓慢。侧向应力大于垂直应力,且固定高度越低,差异越明显。结论牙槽嵴高度的改变,将引起根管壁应力的变化,两者间呈反比例关系。Objective Use FEM to observe the relationship between the change of alveolar ridge's height and the stress change of wall of root canal.Methods Modify the model on the basis of the set up model of the mandibular first molar,simulating the height of alveolar ridge and reducing1/4,1/3,1/2of the height to set up modified model,and load on the modified model by vertical and lateral forces.Then calculate the maximum mises stress of each part of teeth and wall of root canal.Results The stress-changing tendency of each part of wall was similar to the changing tendency of each part of teeth,but the stress of wall was fewer than the stress of teeth.The stress value of original model was close to the modified model at the orifice.Then the stress of original model obviously reduced,and the stress of the modified model reached maximum in the coronal thirds,and when the fixed height was lower,the stress was larger,the stress reduced more slowly.The lateral stress was larger than the vertical stress,and when the fixed height was lower,the difference was more obvious.Conclusion The change of alveolar ridge's height will affect the stress change of wall of root canal,and which is in an inverse proportion.

关 键 词：有限元法 应力分析 冠根比例 根管壁 

分 类 号：R781.4[医药卫生—口腔医学]