论文部分内容阅读
目的:探讨下颌单颌拔牙与双颌拔牙矫治成人骨性反牙合的硬软组织改变的差异。方法:选取成人骨性反牙合患者31例,其中拔除4个前磨牙矫治(甲组)13例,下颌单颌拔除2个前磨牙矫治(乙组)18例。应用X线头影测量对矫治前后的硬软组织变化进行测量。结果:两组SNA、SNB、ANB矫治前后的变化无明显差异。甲组下切牙内收与下唇的变化更为显著,下唇凸度明显减小,甲组面型侧貌改变较乙组更为显著。结论:单颌拔牙模式适用于上颌无拥挤或轻度拥挤的轻中度骨性反牙合患者;双颌拔牙模式适用于上颌伴中重度拥挤的中度骨性反牙合患者。
Objective: To investigate the difference between the changes of hard and soft tissues in orthodontics of mandibular single jaw extraction and bimaxillary extraction. Methods: Totally 31 adult patients with bony anti-occlusion were enrolled in this study. Among them, 13 cases were treated with removal of 4 premolar teeth (group A) and 18 cases with mandibular single-jaw removal of 2 premolar teeth (group B). The changes of hard and soft tissues before and after treatment were measured by X-cephalometry. Results: The changes of SNA, SNB and ANB in the two groups had no significant difference before and after treatment. A group of lower incisors adduction and lower lip changes more pronounced, lower lip convexity significantly reduced, A group of facial profile changes more obvious than the B group. Conclusions: Single-jaw extraction is suitable for patients with mild to moderate maxillary anti-occlusion without crowding or mild crowding. Bilateral maxillary extraction is suitable for patients with moderate-to-severe crowding of maxilla with anti-orthodontics.