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2 results

  • Metric Analyses of the Teeth and Faces of South Australian Twins

  • G.C. Townsend, T. Brown, L.C. Richards, J.R. Rogers, S.K. Pinkerton, G.R. Travan, V.B. Burgess
  • Journal:
    Acta geneticae medicae et gemellologiae: twin research / Volume 35 / Issue 3-4 / October 1986
    Published online by Cambridge University Press:
    01 August 2014, pp. 179-192
    Print publication:
    October 1986
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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.

  • Twin Studies in Craniofacial Genetics: A Review

  • Minoru Nakata
  • Journal:
    Acta geneticae medicae et gemellologiae: twin research / Volume 34 / Issue 1-2 / April 1985
    Published online by Cambridge University Press:
    01 August 2014, pp. 1-14
    Print publication:
    April 1985
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  • A review of the literature on twin studies in craniofacial genetics is presented. The following areas are particularly dealt with: tooth form and size, tooth formation and eruption, dental arch and occlusion, facial form and size, and cleft lip and palate.