摘要
目的:对多曲方丝弓技术中打开咬合所产生的力学系统进行有限元分析,了解多曲方丝弓打开咬合时下颌中切牙牙周膜应力分布情况。方法:建立下颌牙列各牙齿、牙槽骨及切牙牙周膜的有限元模型。然后进一步模拟临床在中切牙处加载75g垂直向下的力,按照考虑或不考虑牙周膜的两种情况,求得牙周膜的应力分布。结果:两种情况下牙周膜部位最大值变化很大。在不考虑牙周膜时,牙根颈部应力最大值达21.6×105g/mm2;考虑牙周膜的缓冲作用时牙根及牙周膜上的应力分布相对均匀,且绝对值变小,但牙槽嵴顶部应力峰值明显变大。结论:①本研究建立的下颌牙列的三维有限元模型,比较符合实际情况,可以适用于多曲方丝弓矫治技术的研究。②多曲方丝弓作用下下颌中切牙牙周膜应力从颈缘到根尖逐渐减小,但在牙槽嵴顶部应力峰值明显增大,易出现牙周膜透明性变。
Objective： The purpose of this article is to study the force system that produced by multi-loop edgewise arch wire while opening the bite. Method： First the finite element model of the mandibular teeth.alveolar bone and the periodontium of mandibular incisors was constructed. Then the force was made on the mandibular incisors to simulate the clinical situation. Result ：The changes of the periodontium were significant. If the periodontium was not concerned, the maximium stress was at the neck of the incisor （21.6 ×10^5g/mm^2）. Conclusion： ①This finite element model was feasible and effective. ②The stress was diminished from the neck to the apical of the root.
出处
《临床口腔医学杂志》
2006年第11期646-648,共3页
Journal of Clinical Stomatology
基金
黑龙江省科技攻关项目(GC037611)
关键词
多曲方丝
牙周膜
有限元分析
下颌牙列
应力分布
multi-loop edgewise arch wire
periodontium
finite element analysis
mandibular dentition
