图5为患儿2007-10-07来本院接受正畸治疗,初戴矫治器时拍摄的图像。从图片中可清晰地看到该患儿已拔除右上乳侧切牙,为相邻扭转中切牙的矫正提供了必要的间隙。使用改良的2×4技术(即2×2):上颌采用附牵引钩的Nance托 Figure 5 for children 2007-10-07 to our hospital to accept orthodontic treatment, wearing the appliance when shooting images. It can be clearly seen from the picture that the child has removed the right upper lateral incisor, which provides the necessary clearance for the correction of the adjacent twisted incisors. Using a modified 2x4 technique (2x2): The Nance rest with a hook on the upper jaw