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目的应用正畸上颌骨前牵引技术对唇腭裂患者在混合牙列早期出现的骨性反进行阻断治疗，研究上颌骨位置的变化情况。方法比较患者治疗前后的头影测量结果，将治疗后的结果与儿童头测量正常值比较，明确上颌骨位置的变化情况。结果治疗后上颌骨的位置前移变化有显著性（P＜0.01），但与正常值之间也存在一些差异。结论后腭裂患者在混合牙列期，使用正畸方法进行上颌前牵引，可明显促进上颌骨发育.但单纯使用正崎尚不能完全矫正唇腭裂继发的颌骨畸形，必须采用综合治疗。
OBJECTIVE: To study the occlusion treatment of bony anterior obstruction in mixed dentition in patients with cleft lip and palate using orthodontic maxillary anterior traction technique to study the changes of maxillary position. Methods The cephalometric results of the patients before and after treatment were compared with those of the normal children. The results of the treatment were compared with the normal values of the head of the child to find out the changes of the position of the maxilla. Results The position of the maxillary bone had a significant change after treatment (P <0.01), but there were some discrepancies with the normal value. Conclusions In the period of mixed dentition, the patients with posterior cleft palate use orthodontic method to maxillary forelimb traction, which can obviously promote the development of the maxilla, but the use of orthodontic treatment can not completely correct the jaw deformity secondary to cleft lip and palate.