GALL线评价功能矫治AngleⅡ1分类错[牙合]的软组织变化

Soft tissue changes of Angle ClassⅡ,DivisionⅠmalocclusion evaluated by GALL line

目的:基于Andrews六要素的美学理论,尝试用GALL线直观评价功能矫治AngleⅡ1分类错[牙合]引起的软组织侧貌改变。方法:收集18例戴用功能矫治结束的10~13岁Ⅱ1错[牙合]患者,利用GAII线作为参考平面对矫治前后的头颅定位侧位片进行测量,评价矫治前后软组织的变化。结果:经过Twin-Block矫治后,LL-GALL、LL-E线、pos-GALL、Z角、NsPos-FH、Cm-Sn-UL(鼻唇角)增大(P<0.01);UL-GALL、G-Sn-Pos(面型角)、Ns-Sn-Pos(面凸角)、Pog-GALL、B-GALL减小(P<0.01)。上唇突度减小,下唇前移,软组织颏前点前移,鼻唇角增加,软组织面凸角减小,患者的凸面型趋向于直面型。结论:这种基于面部协调美学理论的评价方法较传统方法更加直观及个性化地反映出Ⅱ1错[牙合]患者经功能矫治后的软组织侧貌改善。

Objective:To evaluate the soft tissue profile changes of Angle ClassⅡ,DivisionⅠmalocclusion following treatment using GALL line based on the aesthetics of Andrew′s six elements.Methods:Eighteen subjects aged 10-13 years with skeletal Class 11 division 1 malocclusion following orthodontic treatment were included,and underwent evaluation on the changes of soft tissue profile through examination of the lateral cephalometric film using GALL line before and after treatment.Results:After Twin-Block treatment,LL-GALL,LL-E Line,pos-GALL,Z angle,NsPos-FH,Cm-Sn-UL were increased by measurement(P<0.01),yet UL-GALL,G-Sn-Pos(face angle),and Ns-Sn-Pos,Pog-GALL,B-GALL were reduced(P<0.01).The upper lip protrusion was decreased,and the lower lip extended forward.The soft tissue was moved forward at the anterior chin point,and the nasolabial angle was extended with contracted convex angle at facial soft tissue,leading to straight-faced convex type.Conclusion:This evaluation method based on the facial aesthetics can effectively and visually reflect the improved the soft tissue profile in patients with Angle ClassⅡ,DivisionⅠmalocclusion after orthodontics,and is superior to conventional evaluation protocol.