In premolar extraction orthodontic cases, four incisors or six anterior teeth are usually retracted en masse. The torque and vertical control of maxillary anterior teeth is the key to success. The center of resistance ( CR) is an important biomechanical factor that determines the mode of orthodontic tooth movement. If a force is applied with a line of action passing through the CR of maxillary ante-rior teeth, the anterior teeth will undergo bodily movement. Otherwise, inclination movement will occur. This review discussed the fac-tors affecting the position of CR of maxillary anterior teeth and the clinical related implications.%正畸拔牙病例内收前牙时,常采用4个或6个前牙的整体移动,对上前牙转矩和垂直方向的控制是治疗成败的关键.阻抗中心是影响牙齿移动的重要生物力学概念.作用力通过前牙的阻抗中心时,前牙将产生整体移动.反之,则发生倾斜移动.该文旨在对上颌前牙阻抗中心的研究进展及其临床应用作一综述.
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