Diversity in tooth eruption and life history in humans: illustration from a Pygmy population
نویسنده
چکیده
Life history variables (LHV) in primates are closely correlated with the ages of tooth eruption, which are a useful proxy to predict growth and development in extant and extinct species. However, it is not known how tooth eruption ages interact with LHV in polymorphic species such as modern humans. African pygmies are at the one extreme in the range of human size variation. LHV in the Baka pygmies are similar to those in standard populations. We would therefore expect tooth eruption ages to be similar also. This mixed (longitudinal and cross-sectional) study of tooth eruption in Baka individuals of known age reveals that eruption in all tooth classes occurs earlier than in any other human population. Earlier tooth eruption can be related to the particular somatic growth in the Baka but cannot be correlated with LHV. The link between LHV and tooth eruption seems disrupted in H. sapiens, allowing adaptive variations in tooth eruption in response to different environmental constraints while maintaining the unique human life cycle.
منابع مشابه
Eruption time of the first Primary Tooth and its Relationship with Growth Parameters in Children
Introdouction:Tooth eruption is recognized as an important aspect of human growth and development. It can be influenced by a number of factors, and it may reflect the general development of a child’s body. The purpose of this study was to determine the age at which the first primary tooth erupted and its relationship with height, weight and head circumference in 3-15-month children in the...
متن کاملHuman Life History Evolution Explains Dissociation between the Timing of Tooth Eruption and Peak Rates of Root Growth
We explored the relationship between growth in tooth root length and the modern human extended period of childhood. Tooth roots provide support to counter chewing forces and so it is advantageous to grow roots quickly to allow teeth to erupt into function as early as possible. Growth in tooth root length occurs with a characteristic spurt or peak in rate sometime between tooth crown completion ...
متن کاملDental development in Homo naledi
Humans' prolonged somatic development and life history are unique among primates, yet their evolutionary origins remain unclear. Dental development has been used as a proxy to reconstruct life history evolution in the hominin clade and indicates a recent emergence of the human developmental pattern. Here, we analyse tooth formation and eruption in two developing dentitions of Homo naledi, a lat...
متن کاملFirst Primary Tooth Eruption and its Relationship with Birth Weight
Background and purpose: In this study we aimed to identify the association between birth weight and first primary tooth eruption. Materials and methods: This retrospective cohort study was done in infants attending for 12 and 18 months vaccination in Qaemshahr health centers. Multi-stage cluster sampling was performed. Information, including birth weight, height, and head circumference were ex...
متن کاملAcase report of delayed Eruption of a permanent molar tooth Associated with complex odontome
An odontome is a slow growing and non-aggressive odonotogenic tumor composed of enamel,dentin,cementum and pulp tissue.complax odontome comprise of an unorganized mass of odonotogenic tissues,morphologically not resembling the normal teeth.in this report,a case of rare odontoma in a ten-years-old boy that caused dalayed eruption of a maxillary right farst permanent molar,buccal expansion of the...
متن کامل