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本研究从临床的角度观察方丝弓矫治器内收前牙时对上颌切牙位置的控制，揭示了方丝弓矫治器控制上颌切牙唇舌向倾斜度的机理，并对上颌前牙内收时支抗磨牙及上唇突度的变化进行了观察，发现：①一般情况下，０．０２２＂系统的方丝弓矫治器内收上颌切牙关闭间隙时，在０．０１８＂×０．０２５＂方形不锈钢丝切牙段弯制３０°－３５°的扭转角度和１５°－２０°的＂人＂字形曲可以实现对上颌切牙唇舌向倾斜度和垂直位置的有效控制。②口外力是方丝弓矫治器内收前牙时加强支抗的有效措施，使用口外力后前后牙移动比例为４．３１：１。③上唇突点与上切牙切缘内收的移动比例为０．５９：１。
In this study, we observed the position of maxillary incisors during the treatment of maxillary incisors with square arch appliances from a clinical perspective, and revealed the mechanism of square wire appliance controlling maxilla incisor lip inclination. The results showed that: (1) Under normal circumstances, when the maxillary incisors closed within 0.022 “system square wire appliance, ”Square stainless steel wire curved section of the bending angle of 30 ° -35 ° and 15 ° -20 ° of the“ person ”shaped song can be achieved on the maxillary incisor lip tilt and vertical position of the effective control. ② external force is Side silk appliance appliance to strengthen the support of the anterior teeth when the effective measures to prevent the use of external force before and after the tooth movement ratio of 4.31: 1. ③ upper lip bump and incisors edge adduction movement ratio of 0. 59: 1.