摘要
目的 :研究柱状根骨内种植义齿根尖部应力集中区域不同组织界面的应力分布情况 ,以优化种植义齿设计。方法 :在二维柱状根骨内种植义齿无限元模型基础上 ,应用无限元方法分析根尖孔左、右侧应力集中区域应力分布状况。结果 :45°右侧向静力加载下 ,根尖孔两侧无限元区域均出现应力集中 ,近加载力侧呈现拉应力 ,而远离加载力侧呈现压应力 ,应力集中点为种植体与牙根的交汇点 ,从应力集中点开始应力呈放散状逐渐减小 ,但牙周膜区域相反。整个修复体转动中心位置移向根尖孔下方种植体内。结论 :种植体出根尖孔区域受力最大 ,不能将种植体出根尖孔处直径减小来达到保护牙根的目的 ;修复后转动中心位置的变化有助于牙齿的稳定和所承受咬合力的传导 ;
Objective: To study the precise stress distribution in the apical foramen area of endodontic endosseous implant. Methods:After analysis of the two-dimensional endodontic endosseous implants model with finite element method, left and right areas beside the apical foramen were selected as infinite domains for calculation. Results:Under 45° axial right oblique loading, the stress concentration occurred in both infinite domains of the apical foramen. The tension stress concentrated in the infinite domain near the load side,but the other side was compress concentrated. Two stress concentration points were just at the central points, which were intersections between implant and dentin. In the implant and dentin section, the stress reduced in all directions from two stress concentration points, but in the ligament section, the result was contrary. Conclusion:It is helpful to keep the root stable when the fulcrum of the root changed to lower part after restoration. In the implant area,the diameter of implant at the apical foramen of root shouldn't be reduced for the protection of root in clinical work;It is very important to preserve the tissue of periodental ligament for endodontic endosseous implants.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2003年第5期450-453,共4页
Journal of Practical Stomatology
基金
国家自然基金资助项目 (39570 769)
关键词
根骨
义齿种植
治疗
生物力学
应力分布
Infinite element method
Endosseous endodontic dental implantation
Stress analysis
