摘要
目的模拟不同术式远移上颌尖牙,分别建立其三维有限元模型,分析尖牙和牙周组织的生物力学状况。方法分别建立常规状态下移动尖牙(模型1)、牙周膜减阻牵张成骨术移动尖牙(模型2)、牙槽骨减阻牵张成骨术移动尖牙(模型3)的三维有限元模型,在颊腭双侧力的加载后观察牙及周围组织应力分布和位移情况。结果尖牙最大瞬时位移值模型2>模型3>模型1,最大等效应力值模型2<模型1<模型3,最大主应力模型1<模型2<模型3,最大剪切应力模型2<模型1<模型3。结论 "牙周膜减阻牵张成骨"和"牙槽骨减阻牵张成骨"可有效减小牙移动阻力,加大尖牙瞬时位移,且去除尖牙远中骨质效果较去除颊侧骨皮质更为显著。两种方法均成功避免了支抗丧失,但尖牙存在远中倾斜趋势,在临床工作中应加以控制。
Objective This research used three-dimensional finite element analysis to compare the canine distal movement and forced distribution of teeth and periodontal tissue in three ways.Methods This research established three-dimensional finite element models under the conventional condition to move the canine （model 1）,rapid canine movement through distracting osteogenesis of the periodontal ligament （model 2）,rapid canine movement through reducing resistance and distracting method （model 3）,then carried strength on buccal and palatal sides of teeth.Results The biggest displacement quantity on canine：model 2 ＞ model 3 ＞ model 1 ; the biggest equivalent stress：model 2 ＜ model 1 ＜ model 3 ; the biggest principal stress：model 1 ＜ model 2 ＜ model 3 ; the biggest shear stress：model 2 ＜ model 1 ＜ model 3.Conclusion In the process of canine distal movement,reducing bone resistance,especially distal alveolar crest of canine,can accelerate the tooth moving speed effectively.And the two ways successfully avoid the loss of anchorage.While,the canine has distal motion tendency under the action of force,doctors should take appropriate measures to control it in clinical work.
出处
《安徽医科大学学报》
CAS
北大核心
2014年第8期1132-1136,共5页
Acta Universitatis Medicinalis Anhui
基金
新疆维吾尔自治区自然科学基金青年基金(编号:2011211B35)
关键词
牵张成骨
三维有限元法
错颌畸形
牙齿移动
distraction osteogenesis
three-dimensional finite element
malocclusion
tooth movement
