牙列拥挤与前突病例拔牙矫正后牙弓宽度变化对比研究

A comparative study of dental arch widths:anterior crowding and protrusion

目的:通过研究尖牙、第一磨牙及第二磨牙间宽度的变化,对比牙列拥挤和牙列前突病例以及年龄因素对拔牙矫治前后牙弓宽度变化的影响。方法:随机选择60例拔除四个第一前磨牙MBT矫治技术治疗患者,分为拥挤组和前突组及16岁以上组和16岁以下组进行对比研究,取治疗前后记存模型进行测量,并经统计学分析。结果:拔除四个前磨牙病例矫治后,磨牙区牙弓宽度均减小,尖牙区牙弓宽度均增加;拥挤组及16岁以下组尖牙间牙弓宽度增加更明显,磨牙区牙弓宽度减小在各组间无明显差异。结论:拔牙矫正后拥挤组及16岁以下组的尖牙间牙弓宽度增加更明显,所以治疗后的保持需要时间更长。

Objective：By studying the canine,molar and second molar width between the changes in contrast dentition crowding and protrusion cases and age factors on the extraction treatment before and after the arch width change.Method：60 patients with four first premolar extraction treatment of patients with MBT technique,sub crowded group and protrusion group and 16 years old and 16 years of age group underwent comparative studies,taken before and after treatment to measure the model,and by statistical analysis.Result：After treated by MBT technique,the patients got good results.The inter-canine width was increased,the inter-molar width and inter-second molar width was decreased.younger and crowding patients with canine arch width increased more significantly,molar District arch width decreased in each group no significant difference.Conclusion：After correction of the crowded group of tooth extraction and younger patients because of canine arch width increased more significantly,after treatment to maintain it longer needed.