Analysis of the plaster casts of Class Ⅱ division 1 non-extraction patients treated with Alexander technique

VernacularTitle:亚历山大矫治技术非减数矫治安氏Ⅱ类1分类错(牙合)的模型分析
Author: Tian CAO ¹ ; Song WEI ; Yan-Heng ZHOU
Author Information

1. 100081,北京大学口腔医学院·口腔医院正畸科
Keywords: Malocclusion,Angle Class Ⅱ; Dental arch; Dental models; Orthodontic brackets
From: Chinese Journal of Stomatology 2013;48(9):518-522
CountryChina
Language:Chinese
Abstract: Objective To investigate the changes of arch width and arch length in Class Ⅱ division 1 non-extraction patients treated with Alexander technique.Methods Dental casts of 21 Class Ⅱ division 1non-extraction patients treated with Alexander appliance were taken before (T1) and after treatment(T2).All the casts were laser scanned.The arch width and arch length were digitally measured.The differences of arch width and arch length between T1 and T2 were recorded and analyzed.Results The upper arch length decreased from (32.82 ± 2.51) mm to (31.97 ± 2.17) mm (P ＜ 0.05).The lower arch length increased from (27.53 ± 2.61) mm to (28.80 ± 1.81) mm(P ＜ 0.05).The intercanine width in the upper arch changed significantly from T1 to T2.The intermolar width in the upper and lower arches increased significantly from T1 to T2.Conclusions Class Ⅱ division 1 non-extraction patients could be treated successfully by increasing the upper arch width.