桩核高度对下颌桩核基牙式全口覆盖义齿应力分布的影响  

The influence of the height of core on mandibular complete overdenture based on post-core abutment stress distribution

作　　者：张颖[1] 李建华[2] 白乐康[1] 王宇春[1] 

机构地区：[1]西安交通大学口腔医院修复科,陕西西安710004 [2]西安市红十字会医院口腔科,陕西西安710054

出　　处：《西安交通大学学报（医学版）》2005年第3期291-293,共3页Journal of Xi’an Jiaotong University（Medical Sciences）

基　　金：西安交通大学口腔医院青年科研基金资助项目

摘　　要：目的研究桩核高度对下颌桩核基牙式全口覆盖义齿及其支持组织应力分布的影响,为临床工作提供实验依据和指导。方法建立下颌桩核基牙式全口覆盖义齿及其支持组织的三维有限元模型,对义齿行全牙列垂直加载,分别计算当桩核根外段高度为3、4、5、6mm时义齿及其支持组织的应力值并进行比较研究。结果随着桩核根外段高度的增加,基牙牙本质、牙周膜、义齿基托及皮质骨的应力增大,黏膜的应力分布无明显改变。结论在保证义齿固位的前提下,应尽量降低桩核高度,维护组织健康。Objective To study the stress distribution of mandibular complete overdenture based on post-core abutment with various height of core and its supporting tissues, and to offer experimental foundation and guidance for clinical work. Methods 3-D FEA models of mandibular complete overdenture were set up based on post-core abutment and its supporting tissues; vertical loading was imposed on denture; the stress values of denture and its supporting tissues were calculated and analyzed, with the height of core as 3 mm, 4 mm, 5 mm and 6 mm, respectively. Results With the height of core increasing, the stress in dentine, parodontal membrane, denture base plate and cortical bone increased, while the stress in mucosality hardly changed. Conclusion Under the premise of retention, the height of core should be decreased as much as possible to maintain the health of the tissues.

关 键 词：覆盖义齿 桩核 三维有限元 应力分析 

分 类 号：R783.4[医药卫生—口腔医学]