拔牙和不拔牙矫治对牙弓宽度影响的研究

目的:对25例拔牙(4个第一前磨牙)患者和25例不拔牙患者正畸治疗前后的研究模型的上颌和下颌的前牙弓和后牙弓的宽度进行测量,以检验拔牙矫治是否会导致牙弓的狭窄,并进而影响其美学效果.方法:在尖牙和磨牙区唇颊面的最突出的位置进行牙弓宽度测量,将尖牙间和磨牙间的宽度测量数据,进行统计分析.结果:在两组病例中,下颌尖牙间和磨牙间的宽度相同,在拔牙病例中尖牙间宽度比不拔牙宽度多0.93mm(P＜0.01).结论:拔牙矫治与不拔牙矫治相比,前者不会导致牙弓狭窄.

The effect of teeth extraction and nonextraction on odontoasch width

Objective:In this study we have measured the anterior and posterior arch widths of the maxillary and mandibular arches in 25 patients treated by 4 first-premolar extraction and 25 patients treated without extractions on posttreatment study models and compared statistically to determine whether the dental arches were narrower after extraction treatment,and result in less esthetic results because of narrowing of the dental arches. Methods:Measurements were made in the canine and the molar regions from the most labial aspect of the buccal surfaces of the canines and the molars, The measurements were compared statistically.Resuts:In both groups, anterior and posterior arch widths were the same except for the mandibular intercanine dimension, which was 0.93 mm larger (P<0.01) in the extraction group.Conclusion:The extraction treatment does not result in narrower dental arches than nonextraction treatment.