正畸拔牙与不拔牙疗效对比的初步探索

目的　比较患者拔牙与不拔牙正畸治疗在牙齿排列、咬合关系、面形和疗程方面的差异。方法　 5位正畸专家根据治疗前资料挑选出的既可采用拔牙 ,又可采用不拔牙治疗的 39例错畸形患者为研究对象。评价患者的治疗效果 ,再根据患者实际是否采用拔牙治疗进行分组比较。结果　拔牙组与不拔牙组患者 ,在牙齿排列、覆覆盖、中线、侧方咬合关系方面的评分及平均疗程上均无显著性差异 (P >0 0 5 ) ;只有侧貌美观的评分 ,拔牙组高于不拔牙组 ,两组间有显著性差异 (P =0 0 0 1 )。结论　对于临界病例 ,拔牙与不拔牙治疗在牙齿排列、咬合关系方面都能在基本相同的治疗时间取得类似的疗效 ;但拔牙患者 ,无论是拔第一前磨牙还是拔第二前磨牙 ,都比不拔牙患者获得了更加令人满意的面形。

Comparison of Extraction versus Non-extraction Orthodontic Treatment Results--A Preliminary Study

Objective\ 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.Methods\ 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.Results\ 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).Conclusion\ 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.