国产下颌前移器矫治安氏Ⅱ类1分类下颌后缩的临床研究

Clinical Study of ClassⅡdivision 1 Malocclusion Growing Cases Treated with the Domestic Push Rod Apliance

目的:探讨国产下颌前移器治疗生长发育期骨性Ⅱ类1分类下颌后缩患者的临床效果。方法:15 例生长发育期骨性Ⅱ类1分类下颌后缩患者,男9例,女6例;年龄9～15岁,平均12.6岁, 10゜> ANB > 5゜;经方丝弓固定矫治排齐上、下牙列后应用国产下颌前移器治疗,并于治疗前后拍摄头颅定位侧位片,进行测量和统计学分析。结果:经国产下颌前移器治疗5～7个月(平均6个月)后,Ⅱ类磨牙关系矫治为I类关系,覆牙合覆盖减小,头影测量下颌骨的变化最为显著, SNB角增大,下颌升支高度(Ar-Go)、下颌体长度( Go-Gn)增加。上颌骨的生长抑制作用不明显;ANB角减小、矢状关系改善。结论:国产下颌前移器治疗可以促进下颌骨生长,改善骨性矢状关系的不调。

Objective To evaluate the effects of domestic Push rod appliance on jaws and dentition in juveniles with ClassⅡdivision1 malocclusion. Methods Fifteen patients(9 males and 6 females) aged 9-15 years old(average12.6 years) were treated with domestic Push rod appliance Cephalograms were taken pre and post the treatment. Results After 5~7 months (average 6 months) treatment, Class Ⅱ malocclusal relationships were corrected to Class I, ANB angle was significantly reduced. Overjet and overbite corrected significantly ,mandibular ramas height (Ar-Go), mandibular body length (Go-Gn) increased respectively. Mandibular development was remarkable improved. Conclusion Domestic Push rod appliance is effective in the improvement of sagittal skeletal relationship and in orthodontic treatment in the juveniles with ClassⅡdivision1 malocclusion.