三维有限元分析唇侧矫治器的位置改变对上前牙组牙阻抗中心的影响

发布时间：2018-07-01 19:53

本文选题：三维有限元 + 唇侧矫治　；参考：《口腔医学研究》2017年04期

【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。
[Abstract]:Objective: to investigate the effect of the position change of labial brackets on the impedance center of upper anterior teeth. Methods: a three dimensional finite element model of adductive force in labial segment arch was established. The model included three submodels with different height of brackets. The bow wire is set to a rigid body. Taking the arch wire plane between the maxillary central incisors as the starting point, the adductive force parallel to the occlusal plane was applied on the median sagittal plane, and a group of adductive forces were added for each upward 0.5mm. When the displacement ratio of the midpoint of the maxillary incisor to the root tip was close to 1, The vertical height of the impedance center is determined by the direction of the force point through the impedance center of the maxillary anterior tooth, and the vertical compression force is applied on the median sagittal surface of the maxillary anterior teeth in the same way. Determine the sagittal position of the impedance center. Results: the impedance center of maxillary central incisor was located at the incisal root of upper central incisor at 18mm and palatine 13mm at the distance from the incisor to the incisor, and the impedance center was located at 16.5 mm and 13mm from the incisal edge of the maxillary central incisor to 6mm at the distance from the incisor to the centeral incisor. The impedance center is 17.5 mm at the incisal edge of the upper central incisor, with a palatal direction of 12 mm. Conclusion: when the height of labial bracket is changed, the position of impedance center in adductive anterior teeth system is small.
【作者单位】：重庆医科大学附属口腔医院正畸科口腔疾病与生物医学重庆市重点实验室重庆市高校市级口腔生物医学工程重点实验室;
【基金】：重庆市卫生局基金资助项目(编号:20141012、2013-2-069、2015MSXM051)
【分类号】：R783.5

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