摘要
目的:利用已有的舌侧矫治三维有限元模型并进行加力运算,分析个体化舌侧矫治滑动法关闭上颌拔牙间隙阶段,在颊、腭侧不同力值、不同加力组合方式加力时,上前牙的牙周膜应力分布规律,指导临床应用。方法:建立舌侧矫治三维有限元模型,在ANSYS 11.0软件中分别模拟:(1)上颌第二磨牙作为支抗牙进行单独颊侧加力(力值0.75 N、1.00 N、1.50 N);(2)单独腭侧加力(力值0.75 N、1.00 N、1.50 N);(3)颊、腭侧同时加力(颊侧加力1.00 N+腭侧加力0.50 N、颊侧加力0.75 N+腭侧加力0.75 N、颊侧加力0.50 N+腭侧加力1.00 N),分析3种加力方式下上前牙牙周膜的最大主应力、最小主应力和von Mises应力的峰值及分布。结果:(1)单纯颊侧加力时(0.75 N、1.00 N、1.50 N)最大主应力:初始,在侧切牙牙周膜唇侧颈部及尖牙牙周膜腭侧及远中颈部均受压应力,随着加力增大,压应力值及牙周膜受压应力范围增大。最小主应力:初始,在侧切牙牙周膜腭侧颈部及尖牙近中颈部受拉应力,随着加力增大,拉应力值及牙周膜受拉应力范围增大,在中切牙的近、远中颈部牙周膜也出现拉应力区。von Mises应力:初始,牙周膜受应力区集中体现的部位为侧切牙唇、腭侧颈部及尖牙远中颈部,随着加力增大,应力值及牙周膜受力范围向根方扩大,最终,尖牙近中颈部牙周膜也出现应力集中区。(2)单纯腭侧加力(0.75 N、1.00 N、1.50 N)最大主应力:初始,尖牙牙周膜远中偏腭侧颈部,及侧切牙远中偏颊侧和腭侧颈部的牙周膜受压应力,随着加力增大,压应力值及牙周膜受压应力范围增大。最小主应力:初始,侧切牙远中邻面颈部及尖牙近中邻面颈部受拉应力,随着加力增大,拉应力值及牙周膜受拉应力范围增大。von Mises应力:初始,牙周膜受应力区集中于尖牙腭侧及近远中邻面偏腭侧的颈部,随着加力增大,应力值及牙周膜受力范围增大,最终在尖
Objective ：To analyze the stress d is tr ib u t io n in the periodontal ligament （P D L ） under d i f-ferent loading conditions at the stage o f space closure by 3D f in i te element model o f customized lin g u a l appliances. Methods： The 3D f ini te element model was used in ANSYS 11.0 to analyze the stress d is t r i-bution in the PDL under the fol lowing loading conditions ： （1） buccal s l id in g mechanics （0.75 N ,1.00N ,1.50N ）, （2） palatal sl iding mechanics （0.75 N ,1.00 N ,1.50 N ）, （3） pa la ta l-bu ccal combined sliding mechanics （buccal 1.00 N ＋ palatal 0.50 N , buccal 0. 75 N ＋ palatal 0. 75 N , buccal 0.50 N ＋ palatal 1.00 N ） . The maximum p r inc ipal stress,minimum p r in c ip a l stress and von Mises stress were evaluated. Results： （1） buccal s l id in g mechanics （0. 75 N ,l . 00 N ,l . 50 N ） ： maximum p r in c ip a l stress： at the initial of loading, maximum p r in c ip a l stress, w h ich was the compressed stress, dis tribu te d in labial PDL of cervix of lateral incisor, and palatal dis ta l PDL o f cervix o f canine. W ith increasing lo a-ding , the magnitude and range o f the stress was increased. M in im um p r in c ip a l stress ： at the in i t ia l of loading, minimum principal stress wh ich was ton sil stress, dis tribu te d in palatal PDL o f cervix o f lateral incisor and mesial PDL of cervix o f canine. With increasing lo a d in g, the magnitude and range o f m in i-mum principal stress was increased. The area o f min imum p r in c ip a l stress appeared in dis ta l and mesial PDL of cervix of central incisor, von Mises stress ： i t dis tribu te d in la b ia l and palatal PDL o f cervix o f la -teral incisor and distal PDL of cervix o f canine ini t ial ly . With increasing lo a d in g, the magnitude and range of stress was increased towards the direc t io n o f root. F in a l ly , there was stress concentration area at mesial PDL of cervix of canine. （2）
作者
柳大为
李晶
郭亮
荣起国
周彦恒
LIU Da-wei;LI Jing;GUO Liang;RONG Qi-guo;ZHOU Yan-heng(Department of Orthodontics,Peking University School and Hospital of Stomatology ＆ National Engineering Laboratory for Digital and Material Technology of Stomatology ＆ Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China;Department of Biomedical Engineering, College of Engineering,Peking University, Beijing 100871, China)
出处
《北京大学学报（医学版）》
CAS
CSCD
北大核心
2018年第1期141-147,共7页
Journal of Peking University:Health Sciences
基金
北京大学口腔医学院青年基金(PKUSS20110203)
北京大学口腔医学院新技术新疗法项目(PKUSSNCT-11A07)资助~~
关键词
舌侧正畸
牙周膜应力
三维有限元分析
Lingual orthodontics
Stress o f periodontal ligament
3 Dimensional f in i te element analysis
