安氏Ⅱ^2类青少年不拔牙矫治前后的软硬组织变化

Soft and hard tissue changes in non-extraction treatment of class Ⅱ division 2 malocclusion adolescents

目的观察早期矫治安氏Ⅱ^2类青少年不拔牙病例矫治前后的软硬组织的变化。方法31例10～13岁安氏Ⅱ^2病例，使用直丝弓矫治技术配合上颌斜面导板完成不拔牙矫治。分析所有病例治疗前后X线头颅侧位片的软硬组织项目。比较治疗前后软硬组织的变化。结果上前牙舌倾得以纠正，SNB角增大，ANB角减小，提示下颌骨长度增加，软组织面凸角减小，软组织面角和Z角增加，反映出软组织侧貌突度减小。结论安氏Ⅱ^2青少年病例，在上前牙舌倾纠正后，下颌骨有一定程度的生长，配合使用斜面导板，使上下颌骨矢状向位置关系得以改善，相应软组织侧貌美观得以改善。

Objective To investigate the soft and hard tissue changes in non-extraction treatment of AngelⅡclassⅡ division 2 malocclusion adolesconts. Methods 31 classⅡ division 2 case aged 10 - 13 years were treated with SWA without extractions. Cephalometrics analysis was performed before and after treatment. The soft and hard tissue measurements were included in the analysis. Results After treatment the lingually inclined maxillary incisors were corrected, the values of SNB increased and ANB decreased, indicating the length of mandible increased. The values of Ns-Sn-Pos angles decreased, FH-NS-Pg＇ angels increased and 2 angles increased, indicating the soft tissue profile improved. Conclusion In class Ⅱ division 2 malocclusion adolescent cases after the correction of lingually indined maxillary incisors, mandible will grow forward, soft tissue profile will improve esthetics.