Finite element analysis of different load mode on tooth movement for space closure in patient with bimaxillary protrusion
10.3760/cma.j.issn.1002-0098.2016.07.008
- VernacularTitle:不同加载方式滑动法关闭双颌前突患者拔牙间隙的三维有限元分析
- Author:
Xiaobo ZHANG
1
;
Yanfei YIN
;
Hongmei YAO
;
Yaohui HAN
;
Ning WANG
;
Zhenlin GE
Author Information
1. 730030,兰州大学口腔医学院正畸科
- Keywords:
Finite element analysis;
Orthodontic space closure;
Orthodontic appliance design
- From:
Chinese Journal of Stomatology
2016;51(7):415-419
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the stress distribution on the maxillary anterior teeth retracted with sliding mechanics and micro-implant anchorage using different retraction hook heights and positions.Methods DICOM image data including maxilla and upper teeth were obtained with cone-beam CT.The three-dimensional finite element model was constructed using Mimics software.Brackets and archwire model were constructed using Creo software.The models were instantiated using Pro/Engineer software.Abaqus software was used to simulate the sliding mechanics by loading 2 N force on 0,2,4,6,8,10 mm retraction hooks and three different positions,repectively.Rotation of the occlusal plane,the initial displacement and stress distribution of teeth were analyzed.Results Lingual rotation of maxillary central incisor(0.021°),gingival movement of the maxillary first molar(0.005 mm),and clockwise rotation of the maxillary occlusal plane(0.012°) were observed when the force application point located at the archwire level (0 mm).In contrast,0.235° labial rotation of the maxillary central incisor,0.015 mm occlusal movement of the maxillary first molar,and 0.075° anti-clockwise rotation of the maxillary occlusal plane were observed when the force application point located at the higher level(10 mm retraction hook).The more the force application point was located posteriorly at the archwire level,the less lingual rotation of the maxillary central incisor and the more buccal displacement of maxillary first molar was observed.Conclusions Maxillary anterior tooth rotation and retraction,vertical displacement of posterior segment,and rotation of the occlusal plane could be controlled by adjusting the height and position of the retraction hook in space closure using miniscrew and sliding mechanics.
