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目的:探讨双颌前突患者拔除4个前磨牙矫治后软组织侧貌的变化。方法:选择13例双颌前突病例,拔除4个第一前磨牙,以直丝弓矫治技术矫治,对矫治前后软组织侧貌的X线头颅侧位定位片进行测量分析。结果:①拔牙矫治后,上唇突度,下唇突度减少,颏唇沟深度,颏唇沟倾角,“Z”角增大,统计学分析均有显著性差异。②SNPg及SNSPg’没有明显变化。③正畸治疗后,软组织侧貌由突面型成为较平直的面型。结论:双颌前突患者拔牙矫治,可明显改善面部软组织侧貌。
Objective: To investigate the change of soft tissue profile after the removal of four premolar teeth in patients with bimaxillary protrusion. Methods: Thirteen cases of bimaxillary protrusion were selected. Four first premolar teeth were removed and straightened by straight wire arch technique. X - ray cephalometric images of soft tissue profile before and after correction were measured and analyzed. Results: (1) The degree of upper lip protrusion, lower lip protrusion, the depth of chin lip groove, the inclination of chin groove ditch and the angle of “Z” increased after tooth extraction. Statistical analysis showed significant differences. ②SNPg and SNSPg ’did not change significantly. ③ orthodontic treatment, soft tissue profile by the convex surface to become more straight face. Conclusion: Extraction of teeth in patients with bimaxillary protrusion can obviously improve facial soft tissue appearance.