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Metric Analyses of the Teeth and Faces of South Australian Twins

Published online by Cambridge University Press:  01 August 2014

G.C. Townsend ,
T. Brown ,
L.C. Richards ,
J.R. Rogers ,
S.K. Pinkerton ,
G.R. Travan  and
V.B. Burgess
G.C. Townsend*
Affiliation:
Department of Dentistry, University of Adelaide, South Australia
T. Brown
Affiliation:
Department of Dentistry, University of Adelaide, South Australia
L.C. Richards
Affiliation:
Department of Dentistry, University of Adelaide, South Australia
J.R. Rogers
Affiliation:
Department of Dentistry, University of Adelaide, South Australia
S.K. Pinkerton
Affiliation:
Department of Dentistry, University of Adelaide, South Australia
G.R. Travan
Affiliation:
Department of Dentistry, University of Adelaide, South Australia
V.B. Burgess
Affiliation:
Department of Dentistry, University of Adelaide, South Australia
*
Department of Dentistry, The University of Adelaide, Adelaide, South Australia 5000

Abstract

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Procedures are described for the acquisition and analysis of data in a study of the dental and facial characteristics of South Australian twins. Comparisons of the mesiodistal diameters of maxillary incisors in MZ and DZ twins revealed heterogeneity of total variances and evidence of inequality of mean values for some dimensions between MZ and DZ twins. Previous estimates of heritabilities for tooth size, relying on classical assumptions in twin research, may be exaggerated. A preliminary analysis of facial shape was undertaken using a procedure for shape matching based on a least squares fit of homologous coordinates. There was evidence of mirror-imaging in some MZ twin pairs and differences in facial asymmetry between male and female DZ twins. Future extensions of the study using methods for three-dimensional shape analysis are described.

Keywords

Tooth sizeFacial morphologyTwinsCraniofacial geneticsAsymmetryMirror-imagingShape analysis
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 35 , Issue 3-4 , October 1986 , pp. 179 - 192
Copyright
Copyright © The International Society for Twin Studies 1986

References

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