Document Detail

Secular change in the timing of dental root maturation in Portuguese boys and girls.
MedLine Citation:
PMID:  20721978     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: In this study, we compare root formation in a modern sample of living Portuguese children (n = 521), between 6 and 18 years of age, with that of a similar sample of known sex and age Portuguese child skeletons (n = 114), who lived half a century earlier, to assess secular change in dental maturation.
METHODS: The roots of seven developing permanent mandibular teeth were assessed for their maturation in both samples. The median age-of-attainment of root stages was calculated using logistic regression and compared between the samples. The potential influence of mortality bias in root development of the skeletal sample was tested.
RESULTS: No mortality bias effect was detected. We find that the dentition of modern Portuguese boys and girls mature on average 1.22 years and 1.47 years earlier, respectively, compared to their counterparts born one half a century before. Our results also suggest that an earlier timing of attainment of root formation maturational stages was not accompanied by a change in the overall duration of root formation.
CONCLUSIONS: We demonstrate a clear and consistent acceleration in dental root maturation due to secular changes and show that the plasticity in dental development in response to environmental factors is greater than previously thought.
Hugo F V Cardoso; Yann Heuzé; Paula Júlio
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American journal of human biology : the official journal of the Human Biology Council     Volume:  22     ISSN:  1520-6300     ISO Abbreviation:  Am. J. Hum. Biol.     Publication Date:    2010 Nov-Dec
Date Detail:
Created Date:  2010-10-19     Completed Date:  2011-02-03     Revised Date:  2011-03-16    
Medline Journal Info:
Nlm Unique ID:  8915029     Medline TA:  Am J Hum Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  791-800     Citation Subset:  IM    
Copyright Information:
© 2010 Wiley-Liss, Inc.
Universidade de Lisboa, Museu Nacional de História Natural-Departamento de Zoologia e Antropologia & Centro de Biologia Ambiental, 1250-102 Lisboa Lisboa, Portugal.
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MeSH Terms
Age Factors
Child Mortality
Dentition, Permanent*
Sex Factors
Tooth Root / growth & development*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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