Department of Archaeology, The Leverhulme Centre for Human Evolutionary Studies, University of Cambridge, Cambridge, England.
PLoS One. 2021 Nov 5;16(11):e0251953. doi: 10.1371/journal.pone.0251953. eCollection 2021.
Human root and canal number and morphology are highly variable, and internal root canal form and count does not necessarily co-vary directly with external morphology. While several typologies and classifications have been developed to address individual components of teeth, there is a need for a comprehensive system, that captures internal and external root features across all teeth. Using CT scans, the external and internal root morphologies of a global sample of humans are analysed (n = 945). From this analysis a method of classification that captures external and internal root morphology in a way that is intuitive, reproducible, and defines the human phenotypic set is developed. Results provide a robust definition of modern human tooth root phenotypic diversity. The method is modular in nature, allowing for incorporation of past and future classification systems. Additionally, it provides a basis for analysing hominin root morphology in evolutionary, ecological, genetic, and developmental contexts.
人类的牙根和根管数量和形态具有高度的可变性，内部根管形态和数量不一定与外部形态直接相关。虽然已经开发了几种类型学和分类法来解决牙齿的个别组成部分，但需要有一种全面的系统，能够捕捉所有牙齿的内部和外部根特征。本研究使用 CT 扫描分析了全球人类样本的外部和内部牙根形态（n = 945）。在此分析的基础上，开发了一种分类方法，以一种直观、可重复的方式捕捉内外牙根形态，并定义了人类表型集。研究结果为现代人类牙齿根部表型多样性提供了一个稳健的定义。该方法本质上是模块化的，允许纳入过去和未来的分类系统。此外，它还为分析人科动物在进化、生态、遗传和发育背景下的根形态提供了基础。
