Department of Orthodontics, School of Dental Medicine, University of Zagreb, Croatia.
Eur J Orthod. 2009 Dec;31(6):584-9. doi: 10.1093/ejo/cjp013. Epub 2009 Apr 1.
An appropriate relationship of the mesiodistal (MD) widths of the maxillary and mandibular teeth favours optimal post-treatment results. The aims of this study were to determine whether there is a difference in the incidence of tooth size discrepancies among different skeletal malocclusion groups and if gender dimorphism exists. The dental casts and lateral cephalometric radiographs of 301 Croatian subjects (127 males and 174 females, mean age 16.86 +/- 2.93 years) were selected from a larger sample of records of the archives of the Orthodontic Department, School of Dental Medicine, University of Zagreb, Croatia. The subjects were from malocclusion groups according to Angle classification, with the corresponding skeletal characteristics. The MD dimensions of all teeth from first molar to first molar were measured on the dental casts using digital callipers. Statistical analysis was undertaken using Kolmogorov-Smirnov, t, and Scheffé's tests and one-way analysis of variance. A statistically significant gender difference was found in anterior ratio (P = 0.017). A significant difference in the overall and posterior ratio was observed between Class II and Class III subjects. There was a tendency for mandibular tooth size excess in subjects with an Angle Class III malocclusion and for maxillary tooth size excess in those with an Angle Class II malocclusion. The percentage of subjects more than 2 standard deviations from Bolton's means for anterior and overall ratios was 16.28 and 4.32, respectively.
上颌和下颌牙齿的近远中（MD）宽度之间的适当关系有利于获得最佳的治疗后结果。本研究旨在确定不同骨骼错牙合组之间牙齿大小差异的发生率是否存在差异，以及是否存在性别二态性。从克罗地亚萨格勒布大学牙医学院正畸科档案中的更大记录样本中选择了 301 名克罗地亚受试者（127 名男性和 174 名女性，平均年龄 16.86 +/- 2.93 岁）的牙模和侧位头颅侧位片。这些受试者根据 Angle 分类属于错牙合组，具有相应的骨骼特征。使用数字卡尺在牙模上测量了从第一磨牙到第一磨牙的所有牙齿的 MD 尺寸。使用 Kolmogorov-Smirnov、t 和 Scheffé 检验和单向方差分析进行统计分析。在前牙比例（P = 0.017）方面发现了统计学上的显著性别差异。在 Class II 和 Class III 受试者之间观察到整体和后牙比例存在显著差异。Angle Class III 错牙合患者存在下颌牙齿尺寸过大的趋势，Angle Class II 错牙合患者存在上颌牙齿尺寸过大的趋势。Bolton 平均值前牙和整体比例的 2 个标准差以上的受试者百分比分别为 16.28%和 4.32%。
