固定桥修复前后牙槽骨组织的功能性改建  

Functional remodeling of mandibular bone induced by the fixed partial denture

作　　者：苗沛[1] 赵艳芳[1] 辛海涛[1] 

机构地区：[1]第四军医大学口腔医学院口腔修复科,西安710032

出　　处：《实用口腔医学杂志》2013年第3期328-333,共6页Journal of Practical Stomatology

基　　金：国家自然科学基金项目(编号:11072261);陕西省科学技术研究发展计划项目(编号:2011K12-68)

摘　　要：目的:分析固定义齿修复前后基牙牙槽骨组织改建过程及影响因素。方法:建立右下第一磨牙缺失、以前磨牙和磨牙为基牙的固定桥和牙周支持组织的三维有限元模型,将应变能密度骨改建理论与有限元方法结合,分析修复前后牙槽骨组织密度变化。结果:固定义齿修复前后应力分布主要集中在牙槽骨颊舌侧、根分叉和根尖处。修复后应力值明显增加,分布范围扩大。改建过程中牙槽骨密度随着载荷的增大出现先增加然后下降的趋势,组织改建速度加快。结论:固定义齿基牙牙槽骨密度的下降与其所受过大的应力密切相关,临床修复设计时应适当降低修复体及其支持组织所承受的咬合力。Objective： To study the remodeling process and influence factors to the alveolar bone induced by fixed parital denture （FPD） restoration. Methods： 3D finite element （FE） models of FPD with periodontal supporting tissue were established. The abut- ments of the dentition were the mandibular right second premolar and right second molar, and the edentulous area was the mandibular right first molar region. The changes of bone density were studied under physiological loading to simulate the remodeling process of alveolar bone based on the theory of Strain Energy Density （SED）. Results： The higher stress mainly distributed in the alveolar bone of lingual-buccal area, bifurcation and the tip of root of the abutment teeth. The stress value increased, and the region of higher stress distribution extended after the FPD treatment. In addition, bone density increased initially and then decreased with the load increasing during the remodeling process, and the remodeling rate of the supporting tissues was sped up at the same time. Conclusion： The ex- cessive bite force may induce the decrease of bone density around the abutment, therefore the design of FPD should be made in order to decrease the bite force on denture and its supporting tissues.

关 键 词：固定桥 牙槽骨组织改建 应变能密度 有限元分析 

分 类 号：R783[医药卫生—口腔医学]