摘要
目的比较下颌后牙区三单位种植固定义齿时,不同植体数目时周围骨的应力分布。方法利用Abaqus6. 13软件绘制下颌后牙区牙槽骨骨块简化模型,种植体及基台、修复体牙冠模型,分别加载垂直向300N、水平向30N的载荷,观察种植体周围骨皮质的应力分布特征。结果垂直和水平载荷后,种植体周围骨von Mises应力主要集中于种植体颊、舌侧骨皮质表面。与3颗种植体支持的模型比较,2颗种植体支持模型中种植体周围的骨皮质最大von Mises应力(MVMS)分别上升41. 8%和33. 9%,但未超过骨皮质最大屈服强度。结论 2颗种植体支持的三单位种植固定义齿修复时,骨皮质承受的应力比3颗种植体支持的要大,但未超过骨皮质最大屈服强度。
Objective To analyze the three-unit implant-supported fixed prostheses in posterior mandible by finite element analysis. Methods Abaqus 6. 13 was used for finite element analysis. The simplified alveolar bone model,implant,abutment and crown model of mandibular posterior teeth were established. The vertical and transverse loads of 300 N and 30 N were loaded respectively. Stress distribution of cortical bone around the implant was analyzed. Results After the vertical and horizontal loads,the bone von Mises stress around the implant mainly concentrated on the buccal and lingual cortical surfaces. Compared with the three implant-supported models,the cortical maximum von Mises around the implant in the two implant-supported models increased by 41. 8 % and 33. 9%,but did not exceed the maximum cortical yield strength. Conclusion The stress of cortical bone in 2 implant-supported three unit fixed prostheses was larger than that of 3 implants,but did not exceed the maximum yield strength of cortical bone.
作者
冯广智
李钧
庄润涛
杨雪瑾
FENG Guang-zhi;LI Jun;ZHUANG Run-tao;YANG Xue-jin(Department of Stomatology,Beijing Haidian Hospital,Beijing 100080,China)
出处
《北京口腔医学》
CAS
2018年第6期331-335,共5页
Beijing Journal of Stomatology
关键词
有限元分析
种植
固定桥
应力分布
Finite element analysis
Implant
Fixed prostheses
Stress distribution
