非拔牙矫治成人安氏Ⅱ类2分类颏唇美学分析

Chin and Lip Esthetic Changes Analysis in ClassⅡ Division 2 Malocclusion of Adults Treated by Non-extraction Protocol

目的:探讨非拔牙矫治对安氏Ⅱ类2分类错畸形成人患者颏唇部软硬组织的美学变化及影响。方法:选择20位采用非拔牙矫治的安氏Ⅱ类2分类错畸形成人患者为研究对象,使用CASSOS软件进行X线头影测量分析,比较矫治前后颏唇部美学变化。结果:U1-SN角、L1-MP角、U1-AP距、U1-NA距、L1-AP距、L1-NB距增加,U1-L1角减小。前牙牙冠代偿性唇倾以便获得良好覆覆盖。LLP距、EP-LL距增加,下唇前移。结论:通过非拔牙矫治,患者不仅解除了前牙闭锁关系,而且下唇前移的变化使颏唇曲线趋于美观。

Objective：To investigate the soft and hard tissue esthetic changes of the chin and lip in ClassⅡ division 2malocclusion of adults treated by non-extraction.Methods：Twenty adult patients were enrolled and orthodontically treated without extraction.The radiographs were processed using CASSOS Image software.The data was analysed statistically to compare the soft and hard tissue esthetic changes of the chin and lip before and after the treatment.Results：After the treatment,the angles of U1-SN,L1-MP,and the distance of U1-AP,U1-NA,L1-AP,L1-NB were greater than those in pre-treatment.Meanwhile,U1-L1 decreased.Crowns of incisors were compensatorily moved close to labial side so as to acquire proper overbite and overjet.The distance of LLP,EP-LL increased obviously,and the lower lip was moved labially.Conclusion：Patients can not only relieve atresia relationship of anterior teeth but also improve the esthetic curve of chin and lip by protrusion of lower lip after nonextraction treatment.