摘要
目的探讨动态加载时种植桥的骨界面应力分布规律，为临床提供参考。方法在双端种植桥修复前后的有限元模型上，模拟一个咀嚼周期0．875s内连续性的垂直向、舌向及颊向运动，分别对两颗种植基牙和种植桥进行单独加载和共同加载。计算种植体一骨界面的应力并比较，绘制应力图。结果修复前加载5牙冠，斜向加载完成时5-骨界面的应力最大值是垂直加载完成时的4．2倍。修复后同时加载两颗种植基牙的修复冠及桥体，斜向加载完成时5-骨界面的应力最大值是垂直加载完成时的1．2倍。修复前加载在5牙冠上，0．300s时应力最大值为48．393MPa；单独加载种植桥的5I修复冠，0．300s时模型总体最大值为9．541MPa，在7-骨界面的远中颈缘。单独加载桥体和同时加载种植基牙的修复冠及桥体时7-骨界面应力最大值在各时段末均大于5-骨界面。结论双端种植桥减少斜向载荷的不利影响，均匀合理地分布骨界面的应力。
Objective To study the distribution patterns of stresses induced in bone tissue surrounding solely and splinted implants under dynamic loads. Methods Three dimensional finite-element models were created of two 765l sections of the mandible with solely or splinted implants embedded in. Vertical and oblique dynamic loads were applied in a circle of mastication（0. 875 s）. The stress distribution was analyzed to study the biomechanical behavior of bone tissue surrounding solely or splinted implants. Results As loading on the solely implant 5 , the maximum yon Mises value in the surrounding bone tissue under oblique loads at 0. 300 s was 4. 2 times as much as that under vertical loads at 0. 150 s. Meanwhile, as coincidently loading on the splinted implants, the maximum von Mises value at 0. 300 s was 1.2 times as much as that at 0. 150 s. As loading on the solely implant 5 , the maximum stress value was 48. 393 MPa at 0. 300 s. As separately loading on the splinted implant 5 , the maximum stress value of the whole model was 9. 541 MPa in the same loading course, and the maximum stress was located at the distal cervical of the indirectly loaded implant 7. When loading on the pontic, the stress in bone tissue surrounding implant 7 was more than that of implant 5 . Conclusions Stress in the bone-interface of the splinted implants is evenly distributed at the cervical level, which may also reduce disadvantages from oblique loads.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2012年第7期435-438,共4页
Chinese Journal of Stomatology
基金
广东省自然科学基金（31912）
关键词
牙种植体
有限元分析
义齿
局部
固定
动力分析
Dental implants
Finite element analysis
Denture, partial, fixed
Dynamic analysis
