Poosti Maryam, Jalali Tahereh
Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
J Contemp Dent Pract. 2007 Mar 1;8(3):45-52.
The purpose of this investigation was to examine the extent to which arch dimension or tooth size contributes to dental crowding.
Two groups of dental casts were selected. Each group consisted of 30 pairs of dental casts including equal male and female samples. The first group had Class I malocclusions without crowding or spacing. The second group exhibited Class I malocclusions with severe dental crowding (> a 5 mm space deficiency). The following parameters were measured and used to compare the two groups: individual and collective mesiodistal tooth diameters, dental arch length, as well as buccal and lingual dental arch widths in the canine and molar regions. To compare the two groups the Student's t-test with 95% confidence interval was used.
Statistically significant differences in both tooth diameters and transverse arch dimensions were found between the two groups. The crowded group was found to have a significantly smaller maxillary arch width and larger tooth size when compared with the uncrowded group.
The results of this study suggest under equal conditions (a Class I skeletal relationship) tooth size has a greater role in developing dental crowding.
本研究旨在探讨牙弓尺寸或牙齿大小对牙列拥挤的影响程度。
选取两组牙模。每组由30对牙模组成，包括数量相等的男性和女性样本。第一组为I类错牙合，无牙列拥挤或牙间隙。第二组表现为I类错牙合，伴有严重牙列拥挤（间隙不足>5mm）。测量以下参数并用于两组比较：单个牙齿和总体的近远中直径、牙弓长度以及尖牙和磨牙区的颊侧和舌侧牙弓宽度。采用95%置信区间的Student's t检验对两组进行比较。
两组在牙齿直径和横向牙弓尺寸上均存在统计学显著差异。与无拥挤组相比，拥挤组的上颌牙弓宽度明显较小，牙齿尺寸较大。
本研究结果表明，在同等条件下（I类骨骼关系），牙齿大小在牙列拥挤的形成中起更大作用。
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