Xu Tianmin, Yang Minzhi, Huang Wei
Department of Orthodontics, School of Stomatology, Peking University, Beijing 100081, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2003 Jun;21(3):205-7.
The purpose of this study was to make a comparison between extraction and non-extraction orthodontic treatment results concerning teeth alignment, occlusal relation, facial profile and treatment interval.
39 extraction-non-extraction borderline cases were selected by 5 orthodontic specialists through reviewing their pre-treatment records. 5 specialists were then asked to rank the results by marking the post-treatment record of each case. And then the samples were divided into different groups according to extraction, non-extraction and extraction pattern by reviewing case history.
No statistically significant difference was found in teeth alignment, overbite and overjet, midline symmetry, lateral occlusal relation and treatment intervals. However, the post-treatment facial profile of extraction groups obtained higher marks from 5 specialists (P = 0.001).
While both extraction and non-extraction treatment can achieve comparable results in teeth alignment and occlusal relation with equivalent time interval in borderline cases, extraction treatment, whatever extraction of four first premolars or second premolars is performed, can achieve better facial profile.
本研究旨在比较拔牙与非拔牙正畸治疗在牙齿排列、咬合关系、面部轮廓及治疗疗程方面的效果。
5位正畸专科医生通过查阅39例拔牙与非拔牙临界病例的治疗前记录进行筛选。随后要求5位专科医生通过对每个病例的治疗后记录打分来对结果进行排名。接着通过回顾病历将样本按拔牙、非拔牙及拔牙模式分为不同组。
在牙齿排列、覆合覆盖、中线对称性、侧方咬合关系及治疗疗程方面未发现统计学上的显著差异。然而，拔牙组的治疗后面部轮廓获得了5位专科医生更高的评分（P = 0.001）。
在临界病例中，拔牙与非拔牙治疗在牙齿排列和咬合关系方面均可在相同时间间隔内取得可比的效果，但无论拔除四颗第一前磨牙还是第二前磨牙，拔牙治疗都能获得更好的面部轮廓。
