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Comparison of Weights of Twin Fetuses and of their Incisors

Published online by Cambridge University Press:  01 August 2014

M. V. Stack
M. V. Stack*
Affiliation:
University of Bristol Dental School, Bristol
*
Medical Research Council Dental Unit, Dental School, Bristol BS1 2LY, Great Britain

Extract

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Weights of developing incisors in 10 pairs of twin fetuses have previously been related to ages in order to compare dental growth status (Stack, 1963). Ages (T0) at which weights (W) of mineralised portions of teeth of the temporary dentition become significant have been computed (Stack, 1968), using a Fortran program giving maximum likelihood estimates of the required parameters, based on the statistical model of Angleton and Pettus (1966).

Availability of the additional parameter T0 allows a reexamination of the previous data, now fortified by observations on incisors from five further pairs of twin fetuses. Estimates of ages were made from the relationship (T—T0) = k·W½, where values for upper and lower central incisors were 2.0 and 2.8 for k, 19.5 and 18.5 for T0, respectively. Less reliable estimates were obtained from the lateral incisors. These values were computed from observations on 40 dentitions from normal singleton fetuses. Ages were also estimated from tabulated body weights (Documenta Geigy).

Type
Session 6 - Twin Studies in Growth and Senescence
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 19 , Issue 1-2 , April 1970 , pp. 79
Copyright
Copyright © The International Society for Twin Studies 1970

References

Angleton, G. M., Pettus, D. (1966). Relative growth law with a threshold. Perspect. Biol. Med., 9: 421–424.Google Scholar
Stack, M. V. (1963). Incisor growth in twins during the seventh and eighth months of foetal life. Acta Genet. Med. Gemellol., 12: 238–246.Google Scholar
Stack, M. V. (1968). Relative growth of the deciduous second molar and permanent first molar. J. Dent. Res., 47: 1013–1014.Google Scholar