Variation of the intermaxillary tooth-size relationship in normal occlusion.
Variation of the intermaxillary tooth-size relationship in normal occlusion.
复制标题
正常咬合时颌间牙齿尺寸关系的变化。
DOI：
10.1093/ejo/cjp157
复制
发表时间：
2011
影响因子：
2.6
通讯作者：
Heon
中科院分区：
文献类型：
--
作者：
Shin;Sug;W. Lim;Sungim Lee;Johan Lim;Heon
本研究的目的是探讨颌间牙齿大小的关系，是由于正常咬合使用多变量聚类分析，同时将整个牙列作为一个数据集。对307名正常牙合受试者（男188名，女119名;平均年龄±标准差，19.9 ± 3.3岁）中切牙至第二磨牙的牙齿尺寸进行了调查。分别分析了上颌骨和下颌骨的牙齿尺寸数据。聚类时，基于主成分分析（PCA）的转换后的数据进行围绕中心点的分区（PAM）算法。将受试者分为四组后，对聚类成员进行交叉分类，并探讨其分布模式和颌间牙齿大小的关系。博尔顿齿比显示出相对较宽的范围，这表明正常咬合受试者的牙齿大小存在变异性。然而，男性和女性的颌间牙齿大小关系的模式是相似的，这一结果与经典的博尔顿分析的结果是一致的。使用多变量方法分析个体患者的牙齿尺寸数据集，然后将结果与正常咬合集群进行比较，对于确定正畸中牙齿尺寸控制的数量和位置可能具有临床应用价值。
The purpose of this study was to explore the intermaxillary tooth-size relationship that is attributed to normal occlusion using multivariate cluster analysis, while simultaneously incorporating the full dentition as a data set. From the central incisor to the second molar, the tooth sizes of 307 subjects (188 males and 119 females; mean age ± standard deviation, 19.9 ± 3.3 years) with normal occlusion were investigated. Tooth-size data were analysed separately for the maxilla and the mandible. When clustering, the partitioning around medoids (PAM) algorithm was performed with the transformed data based on principal component analysis (PCA). After the subjects were classified into four groups, the cluster memberships were cross-classified, and the distribution pattern and intermaxillary tooth-size relationships were explored. Bolton tooth ratio showed a relatively wide range, and this was indicative of the variability in tooth size in subjects with a normal occlusion. However, the patterns of the intermaxillary tooth-size relationship were similar for males and females, and this result was concordant with the findings of the classic Bolton analysis. Using the multivariate approach to analyse the tooth-size data set of an individual patient and then comparing the results with the normal occlusion cluster has possible clinical applications in determining the amount and location of tooth-size control in orthodontics.