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目的:探讨正畸治疗安氏Ⅱ类Ⅰ分类错畸形的临床有效性。方法:非拔牙矫治,低角病例。口外弓装置配合方丝弓矫治器,采用成品的口外弓颈带水平向后牵引,牵引力最初为350 g,适应1个月后加至400 g,每天戴用12 h,在傍晚及夜间戴用,平均疗程为1年。结果:12例患者,X线片测量显示:SNA角平均增大0.9°,A点受到抑制,SNB角平均增大7.68°,儿童正处于生长发育的高峰期,上颌受到抑制,下颌向前自由生长,所以ANB角减小3.24°,Y-axis角增大0.72°,⊥-T角增加15.48°,MP-FH角增大2.08°。结论:口外弓推磨牙向远中制作简单,使用方便易于被患者接受,因而可以在临床上推广应用。
Objective: To investigate the clinical efficacy of orthodontic treatment of Class Ⅱ division Ⅰ malocclusion. Methods: Non-extraction treatment, low-angle cases. Oral bow device with square wire appliance, the use of finished mouth bow neck strap horizontal traction, the initial traction of 350 g, to adapt to 1 month after the increase to 400 g, wearing daily 12 h, worn in the evening and at night , The average course of treatment for 1 year. Results: In X-ray films of 12 patients, the average SNA angle increased 0.9 °, the point A was inhibited and the SNB angle increased 7.68 ° on average. Children were at the peak of growth and development, the upper jaw was inhibited and the mandible was free forward Therefore, the ANB angle decreases by 3.24 °, the Y-axis angle increases by 0.72 °, the ⊥-T angle increases by 15.48 ° and the MP-FH angle increases by 2.08 °. CONCLUSION: The extraoral bow pushing molars are easy to make in the distance, easy to use and easy to be accepted by the patients, so they can be popularized and applied clinically.