口外弓推上磨牙向后矫治上颌轻度前突

The clinical evaluation of correcting mild maxillary protrusion by molar distalization with face-bow appliance

目的探讨口外弓推上磨牙向后矫治上颌轻度前突的临床效果。方法回顾性研究东莞市人民医院收治的30例替牙晚期安氏Ⅱ类1分类上颌前突患者的临床资料,先用口外弓推上磨牙向后矫治,然后用方丝弓矫治器治疗,对治疗前后相关的软硬组织X线头影测量对比分析。结果所有病例矫治后,上前牙突度及唇倾度得到改善,磨牙关系调整为中性。Mss-Y平均后移4.5mm,Iss-Y平均缩小4.47mm,⊥-SN平均缩小14.33°,⊥-T平均抬高16.21°,差异均有统计学意义(P<0.05)。结论通过口外弓推上磨牙向后矫治上颌轻度前突疗效确切,效果明显,值得临床推广应用。

Objective To investigate clinical result of correcting mild maxillary protrusion by molar distalization with face-bow appliance. Methods A retrospective study on clinical data of 30 patients with Class Ⅱ malocclusion and maxillary protrusion was carried out. The maxillary first molars were moved distally by face bow, and then by Edgewise appliance. The cephalometric films before and after treatment were measured and compared. Results The position of anterior teeth were improved significantly in all patients. The average reduction of Mss-Y, Iss-Y and ⊥-SN were 4.5 mm, 4.47 mm and 14.33°. The average increase of ⊥-T was 16.21°. There was statistically significant difference before and after treatment. Conclusion The clinical result of face-bow appliance was significant in the correcting of mild maxillary protrusion, and should be promoted clinically.