Kondoh Y
Department of Pedodontics, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
Aichi Gakuin Daigaku Shigakkai Shi. 1990 Mar;28(1 Pt 1):159-94.
The purpose of this study was to clarify the relationship between crown size and crown form of deciduous teeth. The materials used in this study were 1063 shed or extracted deciduous teeth of Japanese children that were identified according to the individual's name, sex and age. These deciduous teeth were classified as to each developmental stage of the dental traits appearing on the crown, and were measured for the mesiodistal crown diameter and labio (bucco) lingual crown diameter. The results obtained were summarized as follows. 1. Tooth size i. For the upper deciduous teeth, the mean values of the tooth sizes (mesiodistal crown diameter and labio (bucco) lingual crown diameter) decreased in the order of V, IV, III, I and II with the exception of mesiodistal crown diameter in girls which decreased in the order of V, IV, III (which was equal to I in size) and II. For the lower deciduous teeth, the mean values of the tooth sizes (mesiodistal crown diameter and labio (bucco) lingual crown diameter) decreased in the order of V, IV, III, II and I. ii. The coefficients of covariation had a tendency to be larger in deciduous anterior teeth than in deciduous molars and were especially large in upper and lower deciduous lateral incisors in the mesiodistal crown diameter and in lower first deciduous molars, lower deciduous lateral incisors and lower deciduous canines in the labio (bucco) lingual crown diameter. iii. The mean values of tooth size (mesiodistal crown diameter and labio (bucco) lingual crown diameter) had a tendency to be larger in boys than in girls. Sexual size differences were significant in upper deciduous canines (mesiodistal crown diameter and labio (bucco) lingual crown diameter) and lower deciduous second molars (bucco lingual crown diameter). 2. Frequency of dental traits i. Shovel shaped teeth were found in 83.5% of the upper deciduous central incisors, 91.8% of the deciduous lateral incisors, 29.6% of the deciduous canines and 46.1% of the lower deciduous central incisors, 45.5% of the deciduous lateral incisors, 40.7% of the deciduous canines. ii. Crown surface patterns of the upper deciduous molars: Type 3 in the first deciduous molars and type 4 in the second deciduous molars were found much more frequency.(ABSTRACT TRUNCATED AT 400 WORDS)
本研究的目的是阐明乳牙的冠部大小与冠部形态之间的关系。本研究使用的材料是1063颗日本儿童脱落或拔除的乳牙，这些乳牙根据个人姓名、性别和年龄进行了识别。这些乳牙按照冠部出现的牙齿特征的各个发育阶段进行分类，并测量其近远中冠直径和唇（颊）舌冠直径。所得结果总结如下。1. 牙齿大小i. 对于上颌乳牙，牙齿大小（近远中冠直径和唇（颊）舌冠直径）的平均值按V、IV、III、I和II的顺序递减，但女孩的近远中冠直径按V、IV、III（与I大小相等）和II的顺序递减。对于下颌乳牙，牙齿大小（近远中冠直径和唇（颊）舌冠直径）的平均值按V、IV、III、II和I的顺序递减。ii. 协变系数在乳前牙中比在乳磨牙中更有增大的趋势，在近远中冠直径方面，上下颌乳侧切牙以及在唇（颊）舌冠直径方面，下颌第一乳磨牙、下颌乳侧切牙和下颌乳尖牙中的协变系数尤其大。iii. 牙齿大小（近远中冠直径和唇（颊）舌冠直径）的平均值在男孩中往往比女孩大。性别大小差异在上颌乳尖牙（近远中冠直径和唇（颊）舌冠直径）和下颌第二乳磨牙（颊舌冠直径）中具有显著性。2. 牙齿特征的频率i. 83.5%的上颌乳中切牙、91.8%的乳侧切牙、29.6%的乳尖牙以及46.1%的下颌乳中切牙、45.5%的乳侧切牙、40.7%的乳尖牙发现有铲形牙。ii. 上颌乳磨牙的冠面模式：第一乳磨牙中的3型和第二乳磨牙中的4型出现频率更高。（摘要截于400字）
