摘要
目的 比较自锁和传统托槽非减数矫治安氏Ⅱ类2分类错（牙合）畸形后牙弓及头影测量项目的变化,探讨各自解除拥挤的机制.方法 选取40例非减数矫治的安氏Ⅱ类2分类错（牙合）畸形患者,分别使用自锁托槽（自锁组,20例）和传统托槽（传统组,20例）解除牙列拥挤.测量两组患者治疗前后模型和头影测量项目,比较每组治疗前后差异及治疗差值的组间差异,并分析两组牙列拥挤解除的相关因素.结果 自锁组上颌第一前磨牙区牙弓宽度增加量[ （4.45 ±2.60） mm]和上颌牙弓周长增加量[（6.69±3.65） mm]显著大于传统组[分别为（2.41 ±2.74）和（3.60±2.82） mm] （P＜0.05）.回归分析显示两组拥挤解除的相关因素均是牙弓宽度及牙弓长度的增加,但自锁组牙弓宽度对拥挤解除的贡献大于牙弓长度.结论 非减数矫治安氏Ⅱ类2分类牙列拥挤时,自锁组和传统组均通过牙弓宽度及牙弓长度的增加来解除拥挤,但自锁组更倾向于通过牙弓宽度增加解除拥挤,表现出更强的扩弓效果.
Objective To compare the dental and skeletal changes in patients with Class Ⅱ division 2 malocclusion treated with self-ligating and conventional bracket systems.Methods Forty patients with Class Ⅱ division 2 malocclusion were treated non-extraction.Half of them were treated with self-ligating brackets and the others were treated with conventional brackets.The dental casts and lateral cephalometric radiophotographs were analyzed before and after treatment.Results Significant increase in inter premolar widths,arch lengths,U1-NA,L1-MP and arch perimeters were noted after orthodontic treatment in both groups.Statistically greater increase in upper inter-first premolar [ （4.45 ± 2.60 ） mm ] was found in self-ligating group than in conventional group [ （ 2.41 ± 2.74 ） mm,P 〈 0.05 ]. Stepwise regression analysis indicated that the increase in arch length and arch width contributed to the increase in arch perimeter.Conclusions There were an overall increase in arch widths and lengths in patients treated with self-ligating and conventional bracktets.However,more arch width increase was found in self-ligating group than in conventional group.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2012年第3期139-143,共5页
Chinese Journal of Stomatology
关键词
错[牙合]
安氏Ⅱ类
正畸学
矫正
正畸托架
非减数矫治
Malocclusion, Angle Class II
Orthodontics, corrective
Orthodontic brackets
non-extraction treatment
