Aksu Muge, Kocadereli Ilken
Department of Orthodontics, Faculty of Dentistry, Hacettepe University, Sihhiye, Ankara, Turkey.
Angle Orthod. 2005 Nov;75(6):948-52. doi: 10.1043/0003-3219(2005)75[948:AWCIEA]2.0.CO;2.
The aim of this retrospective study was to examine the dental arch width changes of extraction and nonextraction treatment in Class I patients. The study was performed on pretreatment and posttreatment dental casts of 60 patients (30 extraction and 30 nonextraction). The mean ages were 14.3 +/- 2.02 years for the extraction group and 14.1 +/- 2.9 years for the nonextraction group. The maxillary and mandibular crowding was -6.7 +/- 3.1 and -6.3 +/- 2.8 mm for the extraction group and -4.5 +/- 3.6 and -2.1 +/- 3.5 mm for the nonextraction group, respectively. The intercanine and intermolar arch width measurements were measured using a digital caliper. Paired samples t-test was used to evaluate the treatment changes within each group. To compare the changes between groups, independent samples t-test was performed. At the start of treatment, the maxillary and the mandibular intercanine and intermolar widths of both groups did not differ statistically. At the end of treatment, maxillary and mandibular intercanine widths of both groups increased significantly. The mandibular intermolar width decreased significantly for the extraction group and the maxillary intermolar width increased significantly for the nonextraction group. The decrease in maxillary intermolar width for the extraction group and the increase in mandibular intermolar width for the nonextraction group were not significantly different. No differences were observed between the groups in maxillary and mandibular intercanine widths. Maxillary and mandibular intermolar width indicated a significantly larger value in the nonextraction group than that in the extraction group.
这项回顾性研究的目的是检查Ⅰ类患者拔牙治疗和非拔牙治疗后的牙弓宽度变化。该研究对60例患者（30例拔牙患者和30例非拔牙患者）治疗前和治疗后的石膏模型进行。拔牙组的平均年龄为14.3±2.02岁，非拔牙组为14.1±2.9岁。拔牙组上颌和下颌拥挤度分别为-6.7±3.1和-6.3±2.8mm，非拔牙组分别为-4.5±3.6和-2.1±3.5mm。使用数字卡尺测量尖牙间和磨牙间牙弓宽度。采用配对样本t检验评估每组内的治疗变化。为比较组间变化，进行独立样本t检验。治疗开始时，两组的上颌和下颌尖牙间及磨牙间宽度在统计学上无差异。治疗结束时，两组的上颌和下颌尖牙间宽度均显著增加。拔牙组的下颌磨牙间宽度显著减小，非拔牙组的上颌磨牙间宽度显著增加。拔牙组上颌磨牙间宽度的减小和非拔牙组下颌磨牙间宽度的增加无显著差异。两组的上颌和下颌尖牙间宽度无差异。上颌和下颌磨牙间宽度显示非拔牙组的值显著大于拔牙组。
