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目的:分析探讨Twin-Block矫治器(双垫矫治器)在安氏II类2分类错矫治中的应用效果。方法:选择2007年2月～2008年8月来我院正畸科就诊的安氏II类2分类错并伴下颌后缩的患者9例,年龄8.5～11.5岁,根据矫治前侧位片颈椎形态判断为生长发育加速期或前期。重建咬合关系,制作Twin-Block矫治器,24h戴用矫治器,矫治后拍摄头颅侧位片,比较矫治前后的测量值并进行统计学分析。结果:在经过7～12个月的矫治后9例患者都取得了良好的疗效,磨牙尖牙均达到中性关系,治疗后面型明显改善。SNB角从75.6°增加至79.8°,平均增加4.2°(P<0.05);ANB角由6.5°减小到3.1°,平均减小3.4°(P<0.001);1/NA角平均增加15.5°(P<0.001);1/SN平均增加了17.8°(P<0.001);1/1平均减小了15.5°(P<0.05);MP/FH平均增加了3.0°(P<0.05)。结论:改良Twin-Block矫治器对安氏Ⅱ类2分类具有矫形作用,可诱导下颌功能性前移,协调上下颌关系,改善面型。
Objective: To analyze the effect of Twin-Block appliance (double-pad appliance) in the treatment of Class Ⅱ division 2 malocclusion. Methods: From February 2007 to August 2008 our hospital orthodontic treatment of Class Ⅱ Division 2 malocclusion with mandibular retrusion in patients with 9 cases, aged 8.5 to 11.5 years, according to the treatment of the anteroposterior film Cervical vertebra morphology is judged as accelerated or early growth. Reconstruction of the occlusion relationship, making Twin-Block appliance, wear wearing appliances 24h, after correction of the cranial radiographs, compare the measured values before and after treatment and statistical analysis. Results: After 7 to 12 months of treatment, all the 9 patients achieved good curative effect. The molars reached a neutral relationship, and the surface type of the molars improved obviously. SNB angle increased from 75.6 ° to 79.8 ° with an average increase of 4.2 ° (P <0.05); ANB angle decreased from 6.5 ° to 3.1 ° with an average decrease of 3.4 ° (P <0.001); and the average 1 / NA angle increased by 15.5 ° (P <0.001); 1 / SN increased by 17.8 ° on average (P <0.001); 1/1 decreased by 15.5 ° on average (P <0.05); MP / FH increased by 3.0 ° on average (P <0.05). Conclusion: The modified Twin-Block appliance has an orthopedic effect on Class Ⅱ division 2, which can induce functional advancement of the mandible, coordinate the relationship between the upper and lower jaw, and improve the surface shape.