不同长度和直径桩核的三维光弹性应力分析  

Three-dimensiopal Photoelastic Stress Analysis of Post core with different Lengh and Diameter

作　　者：张保卫[1] 周丕光[1] 杨宠莹[1] 方如华[2] 张林春[2] 

机构地区：[1]上海第二医科大学附属第九人民医院,200011 [2]上海同济大学光测力学教研室

出　　处：《口腔材料器械杂志》2000年第1期8-10,共3页Chinese Journal of Dental Materials and Devices

摘　　要：目的　对比不同长度和直径的桩核受力后应力分布情况。方法　根据桩的长短、粗细将实验分成四组 ,通过垂直和斜向加载 ,采用三维光弹性应力冻结法 ,经模型切片观察计算出模型各测点的最大剪应力。结果　桩的直径增加根尖区最大剪应力相应增高 ,桩核交界处和核与根面交界面最大剪应力明显增高。桩的长度增加 ,应力分布更为均匀。结论　从抗力固位角度出发有一定长度的粗细合适的柱形桩核较为理想。Objective To compare the stress distribution of post cores with different length and diameter after loading. Methods Post cores were divided into four groups according to their length and diameters. Slices of the models were observed and maximal shear stress of each testing point was calculated through 3 dimensional photoelastic stress freezing method,after vertical and oblique loading. Result With the increasing of diametes of post cores the maximal apical shear stress increased accordingly, especially those at the post core junction as well as the core root junctional surface. The longer the post, the more even the stress distribution was. Conclusion From the anti force and retentive points of view, cylindrical post core with a propes length and diameter would be ideal.

关 键 词：应力 光弹性 桩核 冻结 三维光弹性法 

分 类 号：R783.3[医药卫生—口腔医学]