安氏Ⅱ类1分类非拔牙矫治中口外弓作用的初步研究  

Effect of headgear on non-extraction patients with Class Ⅱ division 1 malocclusion-a preliminary study

作　　者：魏松[1] 

机构地区：[1]北京大学口腔医学院·口腔医院正畸科,100081

出　　处：《中华口腔正畸学杂志》2010年第1期6-12,共7页Chinese Journal of Orthodontics

摘　　要：目的 评估安氏Ⅱ类1分类非拔牙矫治中口外弓的作用.方法 选择7例恒牙（牙合）早期安氏Ⅱ类1分类病例,非拔牙矫治.采用亚历山大矫治技术和口外弓颈牵引,在排齐上牙后戴口外弓平均3.54个月,此阶段下颌无任何治疗.对矫治前（T1）和戴口外弓平均3.54个月后（T2）的模型及头颅侧位X线片进行测量,数据做配对t检验分析.结果 上牙弓宽度呈现明显增加,ANB角平均减小1.14°,UI/SN和UI/NA分别减小11.44°和9.08°,前牙覆盖平均减小3.46 mm,以上结果均有显著统计学意义.结论 本研究表明,上颌固定矫治器与口外弓颈牵引联合使用,可以在矫治初期排齐牙齿、扩大上牙弓宽度的基础上,减小上前牙唇倾度和前牙覆盖;矫治初期上牙弓的排齐、整平及上牙弓宽度的变化,解除了原有的后牙尖窝锁结关系,下颌生长能力可以充分体现.Objective To evaluate the effect of headgear on non-extraction patients with Class Ⅱ division 1 malocclusion. Methods Seven patients with Class Ⅱ division 1 malocclusion were included in this study. The patients were treated non-extraction with Alexander brackets and cervical headgear. Treatment started from maxillary arch. After alignment, the upper arch was consolidated and cervical headgear was applied for 3. 54 months on average. During this stage, lower arch had not been treated. Model and cephalometric parameters were examined before treatment （T1） and after using headgear （T2）. Data were analyzed by means of paired t-tests. Results The width of the upper arch was increased significantly. ANB angle, UI/SN, UI/NA and the overjet were decreased by 1. 14°, 11. 44°, 9. 08° and 3. 46 mm, respectively, on average. The changes were statistically significant. Conclusions The fixed appliance combined with cervical headgear could decrease the protrusion of the upper incisor and the overjet due to the expansion of the upper arch. The mandible grew forward after the treatment of the upper arch.

关 键 词：安氏Ⅱ类1分类 非拔牙矫治 口外弓 

分 类 号：R783.5[医药卫生—口腔医学]