颧下嵴区微植体不同高度支抗远移上牙列位移的生物力学分析  

Biomechanical analysis of micro-implant anchorage in the infrazygomatic crest for the distal displacement of the upper dentition at different heights

作　　者：杨建浩 韩璐 李亚茹 张月兰[1] Yang Jian-hao;Han Lu;Li Ya-ru;Zhang Yue-lan(The First Affiliated Hospital of Zhengzhou University,Zhengzhou 450001,Henan Province,China)

机构地区：[1]郑州大学第一附属医院,河南省郑州市450001

出　　处：《中国组织工程研究》2018年第10期1523-1528,共6页Chinese Journal of Tissue Engineering Research

基　　金：河南省科技厅基础与前沿技术研究项目(142300410088)~~

摘　　要：背景:在口腔正畸中,颧下嵴区微植体支抗可避免损伤牙根,又可实现上牙列无阻碍的整体移动,然而其远移上牙列在其牙体本身和牙槽骨应力和应变将会产生何种改变,国内外鲜有报道。目的:建立颧下嵴区微植体不同高度支抗远移上牙列的三维有限元模型,并进行生物力学分析。方法:获取1名正畸科就诊的女性患者锥形束CT数据,以Dicom格式保存后导入Mimics16.01软件,通过自动和手动选择边界,将右上颌骨及牙齿三维重建,再利用Geomagic 8.0软件删除噪点和光滑处理,导入Mimics16.01软件,通过其3 Matics软件进行面/体网格划分,利用Pro E5.0软件建立上颌牙托槽、弓丝及牵引钩和种植体的三维模型,并与上颌及牙三维模型一同导入ANSYS13.0软件,行装配和应力应变分析。结果与结论:(1)成功建立了颧下嵴区微植体支抗远移上牙列三维有限元模型,此模型符合解剖学形态;(2)随着牵引钩高度的增高(1,4,7,10 mm),上颌牙列垂直方向应力逐渐增加,而与水平分力的变化无关;(3)随着牵引钩高度的增高,矢状轴上中切牙、尖牙和第一磨牙牙冠中点的应变逐渐降低;中切牙、尖牙的牙根应变逐渐降低,第一磨牙牙根应变无变化。随着牵引钩高度的增高,垂直轴上中切牙牙冠中点与牙根的应变逐渐增大;尖牙牙冠中点的应变逐渐增加,牙根应变逐渐减小;第一磨牙牙冠中点的应变变化不明显,牙根应变逐渐减小。牙列由顺时针旋转变为逆时针旋转;(4)结果表明,颧下嵴区微植体不同高度支抗远移上牙列三维有限元模型与真实解剖结构一致,能够作为研究颧下嵴区微植体支抗远移上牙列生物力学研究的基础,上牙列阻抗中心在弓丝4-7 mm的位置,可作为颧下嵴区微植体支抗植入点。BACKGROUND:In orthodontics,micro-implant anchorage in the infrazygomatic crest that cannot damage the tooth root can achieve an unobstructed overall movement of the upper dentition.However,little is reported on the stress and strain of the tooth and alveolar bone during the distal movement of the upper dentition.OBJECTIVE:To set up a three-dimensional finite element model to perform a biomechanical analysis of micro-implant anchorage in the infrazygomatic crest for the distal displacement of the upper dentition at different heights.METHODS:Cone-beam CT data from a female patient admitted for orthodontic treatment was saved in Dicom format,and imported into Mimics 16.01 software.Then,a three-dimensional model of the right maxilla and tooth dentition was made by automatically and manually selecting boundaries.The model was imported into Geomagic8.0 for removal of noise dots and smooth processing,and then it was imported into the Mimics16.01 software and meshed for the surface/body through 3 Matics software.Afterwards,three-dimensional models maxillary denture,archwires and traction hooks and implants were established by ProE5.0,and all the models were imported into ANSYS13.0 and assembled and analyzed for stress and strain analysis.RESULTS AND CONCLUSION:We successfully established the three-dimensional finite element model for biomechanical analysis of micro-implant anchorage in the infrazygomatic crest for the distal displacement of the upper dentition at different heights,and this model conformed to the anatomic features.With the increase of the height of traction hooks(1,4,7,10 mm),the vertical stress of the maxillary teeth increased gradually,and had no correlation with the change of the horizontal stress.With the increase of the height of traction hooks,at the sagittal axis,the strain at midpoints of middle incisors,canine teeth,and first molars decreased gradually and the strain at the root of middle incisors and canine teeth also decreased gradually,but there was no change in the strain at the root of first

关 键 词：生物材料 口腔材料 微植体 颧下嵴 正畸 上颌牙 有限元 生物力学 正畸支抗 有限元分析 生物力学 组织工程 

分 类 号：R318[医药卫生—生物医学工程]