Dental Faculty, Universidad Complutense de Madrid, Spain.
Eur J Paediatr Dent. 2009 Dec;10(4):169-75.
The aim of this study was to obtain mesiodistal, buccolingual and height sizes of dental crowns of first and second primary molars in a sample of Spanish children given, not only their anthropological and forensic significance, but also their clinical interest for the future analysis of restorative and orthodontic treatments.
Measurements of mesiodistal, buccolingual size and height of the crowns of primary molars were studied. A transversally descriptive design was carried out and the interrelationship between these three dimensions was established. A sample of 703 first and second primary molars was selected from healthy Spanish boys and girls from 4 to 9 years old. Molars presenting anomalies of the crowns, caries or restorations were excluded. Measurements were made on dental plaster models, using a vernier caliper. Descriptive statistics and Pearson correlation coefficient was obtained and Wilcoxon's non- parametric test was applied for comparison of the mean, analysis of sexual dimorphism and comparison of antimeric teeth.
Average sizes of each group of molars were obtained. Sexual dimorphism was studied utilizing the Wilcoxon test. A variability of relationship between the measurements was found in each molar studied. Primary second molars had less variability than first molars in the three measurements obtained. The measurement with the least variability was height, followed by mesiodistal size.
Measurements of primary molars showed that average sizes of boys' molars were significantly larger than those of girls. Relationship between the three measurements studied was variable but second molars showed less variability than first molars. The relationship between height and width was found significant in most of the molars. i.
本研究的目的是获取西班牙儿童样本中第一和第二乳磨牙的近远中径、颊舌径和牙冠高度的测量值，这些测量值不仅具有人类学和法医学意义，而且对于未来修复和正畸治疗的分析也具有临床意义。
研究了乳磨牙牙冠的近远中径、颊舌径和高度的测量值。采用横断描述性设计，建立了这三个维度之间的相互关系。从 4 至 9 岁的健康西班牙男孩和女孩中选择了 703 颗第一和第二乳磨牙作为样本。排除了牙冠异常、龋齿或修复的磨牙。使用游标卡尺在牙石膏模型上进行测量。获得了描述性统计数据和 Pearson 相关系数，并应用 Wilcoxon 非参数检验比较均值、分析性别二态性以及比较对颌牙。
获得了每组磨牙的平均尺寸。利用 Wilcoxon 检验研究了性别二态性。在研究的每个磨牙中，发现了测量值之间的变异性。在获得的三个测量值中，第二乳磨牙比第一乳磨牙的变异性更小。在三种测量值中，高度的变异性最小，其次是近远中径。
乳磨牙的测量值表明，男孩磨牙的平均尺寸明显大于女孩磨牙。研究中三种测量值之间的关系是可变的，但第二磨牙的变异性小于第一磨牙。在大多数磨牙中，高度和宽度之间存在显著关系。
