基牙牙周膜厚度不同时固定桥应力分布的研究  

Stress distribution of fixed bridge with the different thickness of periodontal membrane around abutments

作　　者：刘建平[1] 王忠义[1] 沈丽娟[1] 潘景光[1] 

机构地区：[1]解放军第四军医大学口腔医学院修复科,陕西省西安市710032

出　　处：《中国临床康复》2004年第17期3254-3255,共2页Chinese Journal of Clinical Rehabilitation

摘　　要：目的:研究固定桥基牙牙周膜厚度不同对双端固定桥应力分布的影响。方法:采用螺旋CT扫描获取健康人下颌骨、牙齿及牙周支持组织的二维图像,通过图像合成软件建立三维数字模型,并应用三维有限元分析软件生成下颌后牙固定桥的三维有限元分析模型。在相同垂直载荷和水平载荷情况下,分析基牙牙周膜厚度不同时固定桥的应力分布。结果:当基牙牙周膜厚度小于0.1mm时固定桥基牙与牙槽骨表面应力大小相当;当基牙牙周膜厚度大于0.1mm小于0.4mm时固定桥牙槽骨表面应力随牙周膜厚度增大而减小但非线性关系;基牙牙周膜厚度大于0.4mm时固定桥牙槽骨表面应力不随牙周膜厚度增加而变化。结论:下颌后牙固定桥的应力分布与基牙牙周膜厚度在一定范围内具有相关性,表现为缓冲作用。AIM:To study the stress distribution of rigid fixed bridge on the different thickness of periodontal membranes around abutments. METHODS:Two dimensional images of mandible bones,teeth and periodontal supporting tissue of healthy people were scanned by spiral CT.Three dimensional digital model was developed by imaging software.The three dimensional finite element model of fixed denture on mandible posterior teeth was then developed. Stress distribution of fixed bridge loaded with the same vertical and horizontal forces was analyzed during different thickness of periodontal membranes around abutments. RESULTS:There were no apparent differences in stress between the fixed bridge abutments and the surface of alveolar bones when the thickness of periodontal membrane around the abutments were less than 0.1 mm.When the thickness of periodontal membranes was between 0.1 mm and 0.4 mm, the stress of the alveolar bones surface reduced with the increase of the thickness of periodontal membranes, and there was a non linear relationship.There was no change in the stress of the alveolar bone surface with the increase of the thickness of periodontal membranes when the thickness was more than 0.4 mm. CONCLUSION:There is a relationship between the stress distribution of fixed bridge on mandible posterior teeth and the thickness of periodontal membranes around abutments,showing cushioning effect.

关 键 词：基牙牙周膜厚度 固定桥 应力分布 三维有限元 

分 类 号：R783[医药卫生—口腔医学]