Kumari Meena, Fida Mubassar
Section of Dentistry, Department of Surgery, The Aga Khan University Hospital, Karachi.
J Coll Physicians Surg Pak. 2010 Jan;20(1):17-21.
To compare the vertical facial and dental arch dimensional changes occurring with extraction and nonextraction orthodontic treatments.
Cross-sectional comparative study.
The Aga Khan University Hospital, Karachi during the period 2003 to 2005.
Data were collected using records of patients who visited the study setting during the study period. Pre- and post-treatment lateral cephalographs and study casts of 81 orthodontic patients (41=non-extraction and 40=premolar extractions) were taken. Variables used for evaluating vertical dimension were Frankfort mandibular plane angle (FMA), facial height (N-Me), facial height ratio (N-ANS/ANS-Me), soft tissue facial height (G' to Me'), soft tissue facial height ratio (G'-Sn'/zn'-Me'), upper first molar to palatal plane and lower first molar to mandibular plane distance, posterior facial height to anterior facial height ratio (PFH/AFH) and Y-axis. Intercanine, interpremolar and intermolar widths and arch depths were also measured. To evaluate the pre-treatment and posttreatment comparison within each group, paired t-tests were used. For pre- and posttreatment comparisons between the extraction and non-extraction groups, independent sample t-tests were used.
The mean age was 15.8+/-1.5 years for non-extraction and 15.4+/-1.2 years for the extraction group. There was no significant difference in the vertical dimensional changes between extraction and non-extraction treatments as it increased in both groups. When comparing posttreatment arch dimensions, there was an increase in the maxillary intermolar width in the non-extraction group while the intermolar widths and arch depths decreased in the extraction group in both arches.
Vertical dimensional changes showed no significant difference between extraction and non-extraction groups. Intermolar widths and arch depths decreased in both arches in the extraction group while the maxillary intermolar width increased in the non-extraction group.
比较拔牙与不拔牙正畸治疗中垂直面部及牙弓尺寸的变化。
横断面比较研究。
2003年至2005年期间位于卡拉奇的阿迦汗大学医院。
利用研究期间到研究机构就诊患者的记录收集数据。拍摄了81例正畸患者（41例不拔牙，40例拔除前磨牙）治疗前和治疗后的头颅侧位片及研究模型。用于评估垂直维度的变量有：法兰克福下颌平面角（FMA）、面部高度（N-Me）、面部高度比（N-ANS/ANS-Me）、软组织面部高度（G'至Me'）、软组织面部高度比（G'-Sn'/zn'-Me'）、上颌第一磨牙至腭平面及下颌第一磨牙至下颌平面的距离、后面部高度与前面部高度比（PFH/AFH）以及Y轴。还测量了尖牙间、前磨牙间及磨牙间宽度和牙弓深度。为评估每组治疗前和治疗后的比较情况，采用配对t检验。为比较拔牙组与不拔牙组治疗前和治疗后的情况，采用独立样本t检验。
不拔牙组的平均年龄为15.8±1.5岁；拔牙组为15.4±1.2岁。拔牙与不拔牙治疗在垂直维度变化上无显著差异，两组均有所增加。比较治疗后的牙弓尺寸时，不拔牙组上颌磨牙间宽度增加，而拔牙组两个牙弓的磨牙间宽度和牙弓深度均减小。
拔牙组与不拔牙组在垂直维度变化上无显著差异。拔牙组两个牙弓的磨牙间宽度和牙弓深度均减小，而不拔牙组上颌磨牙间宽度增加。
