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目的探讨用微种植体支抗整体法内收上颌前牙时组牙的复合阻抗中心位置以及牙齿的初始移动规律。方法用多层螺旋CT对干颅进行扫描,经MIMICS8.0,ABAQUS6.5构建“微种植体支抗-上颌前牙整体内收力系”的三维有限元模型,数值模拟从不同高度平面施以水平向内收载荷,并分别计算上颌中、侧切牙、尖牙的初始位移以及初始旋转角度,从而推算牙齿的阻抗中心位置。结果整体内收力作用下上颌前牙段的阻抗中心高度为距离牙槽嵴顶5.1mm处。在微种植体支抗整体内收上颌前牙力系中,中切牙、侧切牙以及尖牙的旋转中心常数分别为50.26、57.30、132.73mm2。结论运用微种植体支抗技术整体内收上颌前牙时通过改变力的作用点可以有效控制牙齿的整体移动或倾斜移动方式。
OBJECTIVE: To investigate the central composite impedance of teeth and the initial movement of teeth when the maxillary anterior teeth are supported by the micro-implant brace. Methods The cranial cranium was scanned with multi-slice spiral CT, and the three-dimensional finite element model of “micro-implant support-total internal force system of maxillary anterior teeth” was constructed by MIMICS8.0 and ABAQUS6.5. The numerical simulation was performed from different heights The plane was loaded horizontally and inwardly, and the maxillary central incisor, lateral incisor, canine initial displacement and initial rotation angle were respectively calculated to calculate the center of impedance of the tooth. Results Under the condition of total internal force, the height of impedance center of anterior maxilla was 5.1mm from the alveolar crest. The center of rotation of the central incisor, lateral incisor and canine were respectively 50.26, 57.30 and 132.73 mm2 in the micro-implant support total internal mandibular anterior teeth force system. Conclusion The micro-implant anchorage technique can effectively control the overall movement or tilt movement of the teeth by changing the point of force when the maxillary anterior teeth are implanted.