舌簧活动矫治器和垂直开大曲联合直丝弓矫治器治疗恒牙早期骨性Ⅲ错合的疗效评价

Research of treatment effects of double parabolic lingual springs appliance and open vertical loops in combination with straight wire appliance therapy on skeletal class Ⅲ malocclusion in early permanent dentition

目的 评价舌簧活动矫治器和垂直开大曲联合直丝弓矫治器治疗恒牙早期骨性Ⅲ错合的疗效.方法 对采用舌簧活动矫治器和垂直开大曲联合直丝弓矫治器治疗恒牙早期骨性Ⅲ错合30例患者的临床资料进行分析,在矫治前和矫治后拍摄并分析头颅侧位定位X线片,比较治疗前后的变化.结果 治疗后,由蝶鞍中心鼻根点及上齿槽座点所构成的角（SNA）增加（3.20±0.36）°,由蝶鞍中心鼻根点及下齿槽座点所构成的角（SNB）减少（-0.39±0.48）°,上齿槽座点鼻根点及下齿槽座点所构成的角（ANB）减少（4.69±.1.34）°,上唇最凸点至E平面的距离（Ls-E）增大（3.50± 1.14）mm,与治疗前比较,差异均有统计学意义（t=-4.65、2.73、-8.42、-4.32,均P＜0.01）.结论 舌簧活动矫治器和垂直开大曲联合直丝弓矫治器治疗恒牙早期骨性Ⅲ错合的疗效明显,值得推广.

Objective To evaluate the treatment effects of double parabolic lingual springs appliance and open vertical loops in combination with straight wire appliance therapy on skeletal class Ⅲ malocclusion in early permanent dentition.Methods 30 cases with skeletal class Ⅲ malocclusion in early permanent dentition were treated by double parabolic lingual springs appliance and open vertical loops in combination with straight wire appliance.Cephalometric tracing measurement was taken to analyze and compare between pretreatment and posttreatment.Results The comparison of before and after orthodontic treatment showed angle SNA increased （3.20 ± 0.36）°,angle SNB decreased （-0.39 ± 0.48）°,angle ANB decreased （4.69 ± 1.34）°,Ls-E increased （3.50 ± 1.14） mm （t=-4.65,2.73,-8.42,-4.32,all P〈0.01）.Conclusion The above metioned technique could be a reliable way to treat mild and moderate skeletal class Ⅲ malocclusion.