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Journal of Dental Research
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Clinical

Root Lengths in 47,XYY Males’ Permanent Teeth

R. Lähdesmäki1,* and L. Alvesalo1,2

1 Department of Oral Development and Orthodontics, Institute of Dentistry, University of Oulu, PL 5281, FIN-90014 OULUN YLIOPISTO, Finland; and 2 University Hospital of Oulu, Finland;

Correspondence: * corresponding author, rlahdesm{at}mail.student.oulu.fi

Studies on individuals with sex chromosome anomalies have demonstrated the promoting effect of the Y chromosome on tooth crown enamel and dentin growth. The present research investigated permanent tooth root lengths in 47,XYY males. The measurements were made from panoramic radiographs. The results indicate longer tooth roots in 47,XYY males compared with those in control males and females. The promoting effect of the Y chromosome on dental growth thus continues in the form of root dentin after the completion of crown growth. The results, together with those on tooth crown sizes in 47,XYY males, suggest that growth excesses are evident and final, beginning a few months after birth and continuing up to the age of 14 years, at least. The excess root dentin growth in 47,XYY males, as well as sexual dimorphism in the growth of crown and root dentin, might be caused by the same factor on the Y chromosome.

Key Words: 47,XYY males • Y chromosome • dental growth • tooth root • sexual dimorphism

Journal of Dental Research, Vol. 83, No. 10, 771-775 (2004)
DOI: 10.1177/154405910408301007
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Home page
 Eur J OrthodHome page
R. Lahdesmaki and L. Alvesalo
Root growth in the permanent teeth of 45,X/46,XX females
Eur J Orthod, August 1, 2006; 28(4): 339 - 344.
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