摘要
目的:探究唇侧托槽位置改变对上前牙组牙阻抗中心的影响。方法:建立唇侧片段弓内收力系的三维有限元模型,其中模型包括3个不同托槽位置高度的子模型。弓丝设置为刚性体。以上颌中切牙之间的弓丝平面为起点,通过正中矢状面分别施加平行于咬合平面的内收力,每向上0.5mm增加一组内收力,当上颌前牙切缘中点的位移与根尖的位移比值接近1时,则认为上前牙发生了整体移动,该施力点的方向通过上颌前牙的阻抗中心,从而确定阻抗中心垂直向的高度;以同样方式在上颌前牙组牙的正中矢状面施加垂直压入力,确定阻抗中心矢状向的位置。结果:上颌中切牙唇侧托槽距离切缘4mm时,阻抗中心位于上中切牙切缘根方18mm,腭向13mm;距离切缘5mm时,阻抗中心的位置位于上中切牙切缘根方16.5mm,腭向13mm;距离切缘6mm时,阻抗中心的位于上中切牙切缘根方17.5mm,腭向12mm。结论:唇侧托槽位置高度改变时,内收上前牙体系中的上前牙组牙阻抗中心位置变化较小。
Objective：To investigate the influence of labial bracket position on the resistance center of upper anterior teeth.Methods：The 3Dfinite element analysis（FEM）models of segment retraction force system with labial brackets placed at different heights were constructed.The arch wire was set as rigid.Retraction force was applied to the anterior teeth（every 0.5mm above the arch wire）and was parallel to the arch wire.When the ratio of the displacement of maxillary incisor edge＇s middle point to the apex was close to 1,the bodily movement was considered to occur to the anterior teeth,and the perpendicular distance of center of resistance was recorded.The anteroposterior position of resistance center in the same way was determined.Results：In labial orthodontics,when the distance of maxillary anterior teeth＇s brackets to the incisor edge was 5mm,the location of the center of resistance was 16.5mm apical and posterior 13 mm to the incisor edge.When the distance was 6mm,the location of center of resistance was 17.5mm apical and posterior 12 mm to the incisor edge.When the distance was 4mm,the location of center of resistance was 18 mm apical and posterior 13 mm to the incisor edge.Conclusion：The positions of resistance center of different labial bracket positions showed little difference.
出处
《口腔医学研究》
CAS
北大核心
2017年第4期416-419,共4页
Journal of Oral Science Research
基金
重庆市卫生局基金资助项目(编号:20141012、2013-2-069、2015MSXM051)
关键词
三维有限元
唇侧矫治
生物力学
阻抗中心
Three dimensional finite element analysis
Labial orthodontic treatment
Biomechanics
Center of resistance
作者简介
吕志鹏（1990～），男，福建人，硕士，主要从事口腔正畸学研究工作。
通讯作者,张赫，电话：13983231065
