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Type: Journal article
Title: Intrauterine hormone effects on tooth dimensions
Author: Ribeiro, D.
Brook, A.
Hughes, T.
Sampson, W.
Townsend, G.
Citation: Journal of Dental Research, 2013; 92(5):425-431
Publisher: Inter Amer Assoc Dental Research
Issue Date: 2013
ISSN: 0022-0345
Statement of
D.C. Ribeiro, A.H. Brook, T.E. Hughes, W.J. Sampson, and G.C. Townsend
Abstract: The human dentition is a complex adaptive system that is influenced by genetic, epigenetic, and environmental factors. Within this system, is sexual dimorphism related to the growth promotion of the Y chromosome, or to hormonal influences, or both? This study is the first to investigate both primary and permanent tooth sizes in females from opposite-sex dizygotic (DZOS) twin pairs compared with females from dizygotic same-sex (DZSS) and monozygotic (MZ) twin pairs to indicate the influence of intrauterine male hormone, including the initial testosterone surge, on dental development. Serial dental models of the primary, mixed, and permanent dentitions of 134 females from DZOS, DZSS, and MZ twins were examined. Mesiodistal, buccolingual, crown height, and intercuspal dimensions of all primary teeth and selected permanent teeth were determined by image analysis. Univariate and multivariate analyses showed statistically significantly larger crown size in DZOS females in both dentitions, with the crown height dimensions displaying the greatest increase in size. These findings strongly support the Twin Testosterone Transfer (TTT) hypothesis. We propose that the growth-promoting effects of the Y chromosome and intrauterine male hormone levels influence different tooth dimensions and contribute differentially to the sexual dimorphism of human teeth.
Keywords: twins; testosterone; Y chromosome; dentition; odontogenesis; genetics
Rights: © International & American Associations for Dental Research
RMID: 0020127907
DOI: 10.1177/0022034513484934
Appears in Collections:Dentistry publications

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