目的 探讨双颌前突错(牙合)畸形成人患者拔牙矫治后软硬组织的变化.方法 选取16例双颌前突错畸形成人患者,均于拔牙后应用直丝弓或方丝弓技术进行矫治,并做治疗前后X线头颅侧位定位片测量,以分析治疗前后软硬组织的变化.结果 (1)上下颌骨间关系无明显变化[SNA、SNB、ANB变化无统计学意义(P > 0.05)];(2)L1-MP、U1-L1、U1-NA、L1-NB前后差异均有统计学意义﹙P ＜ 0.01﹚,上下前牙突度和倾斜度明显减小;(3)颏厚(Pos-Po)、鼻唇角(Cm-Sn-Ls)、面凸角(N′-Sn-Pg′)、上唇厚(UL-UI)、下唇厚(LL-LI)、上下唇角(A′UL-B′LL)治疗后显著增大,鼻、唇、颏的协调关系得以明显改善.结论 双颌前突错畸形成人患者拔牙矫正后,切牙后移可以改善双颌前突侧貌和唇的闭合功能,但对骨骼作用不明显.“,”Objective To investigate the changes of soft and hard-tissue profile following orthodontic treatment of bimaxillary protrusion in adults with teeth extraction. Methods 16 adult bimaxillary protrusion cases were selected to be treated with straight wire technique consisting of teeth extraction. Cephalometrics were taken before and after treatment. The changes of soft and hard-tissue profile were studied with computer-aided X-ray cephalometric analysis. Results (1)The relationship between the maxillary and the mandible did not change significantly [SNA, SNB, ANB had no significant difference in cephalometric measurement (P ＞ 0.05)]. (2)L1-MP, U1-L1, U1-NA, L1-NB, U1-L1 angle changes in hard tissue had significant difference in cephalometric measurement (P ＜ 0.01). The upper and lower anterior teeth were more retrusive, and the tripping of incisor decreased significantly. (3)Analysis of related projects cephalometric showed that lateral appearance improved significantly, Soft tissue Cephalometric related Cm-Sn-Ls、UL-UI、LL-LI、Pos-Po、A′UL-B′LL measurements increased significantly; Ns-Sn-Pog and other indicators in soft tissue also improved. Conclusion Soft and hard-tissue profile improve significantly after orthodontic treatment with teeth extraction in bimaxillary protrusive adults, however, the relationship between the maxillary and the mandible do not change significantly.