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目的 评价应用上颌快速扩弓和前方牵引联合治疗早期骨性Ⅲ类错牙合的头影测量变化。方法 对 12例以上颌骨发育不足为主的骨性Ⅲ类错牙合儿童进行了近 8个月的联合治疗 ,选择与治疗组在人数、年龄、性别相匹配的未经治疗的骨性Ⅲ类错牙合作为对照组 ,比较治疗组在治疗前后以及对照组的头影测量变化。结果 治疗组A点和ANS明显前移伴有SNA、ANB和NA/Pg的显著性增加。上颌逆时针旋转 ,下颌顺时针旋转。治疗组较对照组在SNA ,ANB ,NA/Pg角的增加 ,A点ANS和PNS的前移以及Pg下移均有显著性差异。 结论 上颌快速扩弓和前方牵引能使上颌明显前移 ,同时下颌顺时针旋转更有利于患者侧面外形的改善。
Objective To evaluate the change of cephalometric measurement of early stage skeletal Class Ⅲ malocclusion using rapid maxillary expansion combined with anterior traction. Methods Twelve patients with skeletal class Ⅲ malocclusion with maxillary hypoplasia were treated with combination therapy for nearly 8 months. The treatment group was selected for treatment of osteoporosis Type of co-operation as the control group, comparing the treatment group before and after treatment and control group cephalometric changes. Results A point of treatment group and ANS significantly advanced with significant increase of SNA, ANB and NA / Pg. Clockwise rotation of the maxilla, mandibular clockwise rotation. The treatment group than the control group in the SNA, ANB, NA / Pg angle increases, A point ANS and PNS forward and Pg down were significantly different. Conclusion Maxillary rapid expansion and anterior traction can make the maxillary forward significantly, while clockwise mandibular rotation is more conducive to the improvement of the side profile of patients.