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

摘要

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.%目的 探讨亚历山大矫治技术非减数矫治安氏Ⅱ类1分类错(牙合)的牙弓变化,为临床提供参考.方法 选取使用亚历山大技术非减数矫治的安氏Ⅱ类1分类错(牙合)患者21例,对矫治前后的研究模型进行数字化三维测量.采用配对t检验分析矫治前后牙弓宽度和长度的变化.结果 矫治前后上颌第一前磨牙间宽度分别为(37.00±2.95)和(38.76 ±1.61) mm；上颌第二前磨牙间宽度分别为(42.93±2.77)和(44.37 ±1.97) mm；上下颌第一磨牙间宽度从矫治前的(47.50±3.08)、(42.39 ±3.01) mm增加为矫治后的(49.06 ±2.19)、(43.34 ±2.17) mm；下颌牙弓长度从(27.53±2.61) mm增加为(28.80 ±1.81) mm,而上颌牙弓长度则从(32.82±2.51) mm减少为(31.97±2.17) mm;矫治前后的差异均有统计学意义(P＜0.05).结论 使用亚历山大技术非减数矫治安氏Ⅱ类1分类错(牙合),可通过扩大上颌牙弓宽度得到间隙,内收唇倾的上前牙,减小前牙覆盖.