Liversidge H M
Department of Paediatric Dentistry, St Bartholomew's and the Royal London School of Medicine and Dentistry, Queen Mary and Westfield College, University of London, Turner Street, London E1 2AD, UK.
Arch Oral Biol. 2000 Sep;45(9):713-21. doi: 10.1016/s0003-9969(00)00055-8.
One gap in knowledge of human dental-growth standards is the age at which crown fractions of anterior permanent teeth are attained. The aim of this study was to document stages of crown formation for permanent incisors and canines from a small skeletal collection of known age. The source was C18th and C19th coffin-buried skeletal material from Spitalfields in London; developing teeth from 50 individuals with recorded age-at-death (range 0-5.40 years) and 56 unaged individuals were assessed. Teeth were dissected and crown height measured directly. Each developing crown was assigned to the nearest average fraction (C14, C12, C34, Cc). These fractions were calculated from the total crown height of unworn completed teeth from this sample. Median age for C12 of the permanent upper central incisor was 1.34 years (n=16) and for the canine was 2.52 years (n=16). Data on crown formation are also presented in relation to permanent lower first molar stages C12, C34 and Cc. When M(1) was at stage C34 the modal stage for I(1) was C34 and for other incisors and canines was C12. Although the sample is small, these results fill an important gap in tooth chronology and add to knowledge of growth variation in early childhood.
人类牙齿生长标准知识方面的一个空白是恒牙前牙冠部达到各部分比例的年龄。本研究的目的是记录已知年龄的少量骨骼样本中恒切牙和尖牙的牙冠形成阶段。样本来源是伦敦斯皮塔菲尔德18世纪和19世纪埋葬于棺材中的骨骼材料；对50名有记录死亡年龄（范围0 - 5.40岁）的个体以及56名未记录年龄的个体的正在发育的牙齿进行了评估。牙齿被解剖并直接测量牙冠高度。每个正在发育的牙冠被归为最接近的平均比例（C1/4、C1/2、C3/4、Cc）。这些比例是根据该样本中未磨损的完整牙齿的总牙冠高度计算得出的。上颌恒中切牙达到C1/2阶段的中位年龄为1.34岁（n = 16），尖牙为2.52岁（n = 16）。还给出了与恒下颌第一磨牙C1/2、C3/4和Cc阶段相关的牙冠形成数据。当M(1)处于C3/4阶段时，I(1)的最常见阶段为C3/4，其他切牙和尖牙的最常见阶段为C1/2。尽管样本量较小，但这些结果填补了牙齿年代学方面的一个重要空白，并增加了对幼儿期生长变异的认识。
