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Journal of Dental Research
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Crown Size-Arch Space Relationships During Human Prenatal Dental Development

S.M. Garn

Center for Human Growth and Development and The Department of Anatomy. The University of Michigan School of Medicine, Ann Arbor, MI 48109 USA

A.R. Burdi

Center for Human Growth and Development and The Department of Anatomy. The University of Michigan School of Medicine, Ann Arbor, MI 48109 USA

W.J. Babler

Center for Human Growth and Development and The Department of Anatomy. The University of Michigan School of Medicine, Ann Arbor, MI 48109 USA

R. Asp

Center for Human Growth and Development and The Department of Anatomy. The University of Michigan School of Medicine, Ann Arbor, MI 48109 USA

As shown in composite reconstructions made from optically-projected measurements of 10µ frontal maxillofacial sections of 20 histologically normal fetuses and embryos in the 70-255 mm CRL range, individual differences in relative tooth size and interdental spacing are evident by 10.5-11 weeks of gestation, and age-corrected crown-size correlations (r=0.40) approximate those in postnatal life. Despite an eight-fold increase in crown dimensions, interdental spacing remains approximately constant after 150 mm CRL, suggesting that the tooth organs or the periodontal membranes are able to maintain spacing, into the third trimester.

Journal of Dental Research, Vol. 58, No. 2, 554-559 (1979)
DOI: 10.1177/00220345790580020301
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N. Prasad and A.R. Burdi
Crown Area as an Indicator of Changing Crown Size in Human Pre-natal Teeth
Journal of Dental Research, November 1, 1984; 63(11): 1302 - 1305.
[Abstract] [PDF]