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目的初步探讨口外弓支抗下双颌前突病例治疗前后软硬组织的改变。方法 18例拔除4个第一双尖牙,并应用口外弓增强支抗的成年男性双颌前突患者,测量其治疗前后软、硬组织的改变。结果软组织测量项目显示,经过正畸治疗患者的上下唇突度、软组织A点及B点的突度减小,颏唇沟深度增加,差异有统计学意义(P<0.01)。结论口外弓支抗控制下拔除4个双尖牙后双颌前突成人侧貌改变显著。
Objective To study the changes of soft and hard tissue before and after bimaxillary process in patients with bimaxillary protrusion. Methods Eighteen cases of bilateral maxillary protuberant patients were enrolled in this study. Four pairs of first bicuspid canals were removed, and the patients with bimaxillary protrusion were treated with external arch augmentation. The changes of soft and hard tissues before and after treatment were measured. Results The results of soft tissue measurement showed that the protrusion of upper lip and lower lip of patients under orthodontic treatment reduced the protrusion of soft tissue at point A and point B, and increased the depth of chin and labial groove. The difference was statistically significant (P <0.01). Conclusion Bilateral maxillary protrusion is obviously changed in adults after the removal of four bidentata under the control of oral arch support.