目的确定正畸治疗中非拔牙和拔除四个前磨牙治疗完成后患者面形是否存在差异。方法１９２名正畸医师分别提供２５例曾用非拔牙矫治和２５例曾用拔牙矫治患者的面部照片，调查返还率是５４％。侧位面部照片的评价以头颅测量描迹为基础。结果两组患者矫治前、后的侧面像显示... Objective To determine whether there is a difference in the shape of the patient after the treatment of non-extraction and extraction of the four premolar teeth. Methods A total of 192 orthodontic doctors provided facial photographs of 25 patients who had been treated with non-extraction treatment and 25 patients who had used extraction treatment respectively. The survey return rate was 54%. The evaluation of lateral facial photographs is based on skull measurement tracings. The results of two groups of patients before and after correction of the lateral image shows ...