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Related Experiment Videos

Tooth size and morphology in twins.

M Kabban1, J Fearne, V Jovanovski

  • 1Department of Paediatric Dentistry, St Bartholomew's and The Royal London School of Medicine and Dentistry, UK. mariellekabban@yahoo.co.uk

International Journal of Paediatric Dentistry
|September 27, 2001
PubMed
Summary

Identical twins (monozygotic) exhibit greater tooth size and shape similarity than fraternal twins (dizygotic), indicating a strong genetic influence on dental traits.

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Area of Science:

  • Dental Anthropology
  • Human Genetics
  • Forensic Odontology

Background:

  • Tooth size and occlusal morphology are complex traits.
  • Understanding the genetic versus environmental contributions to dental development is crucial.

Purpose of the Study:

  • To evaluate the concordance of tooth size and occlusal morphology in monozygotic (MZ) and dizygotic (DZ) twins.
  • To compare dental trait similarity between twins and unrelated individuals to assess heritability.

Main Methods:

  • Measured mesiodistal and bucco-lingual tooth dimensions in 34 twin pairs using dial calipers.
  • Assessed occlusal morphology of nine teeth pairs using a laser probe on a coordinate measuring machine.

Main Results:

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  • Greater concordance in tooth size (mesiodistal and bucco-lingual) was observed within twin pairs compared to unrelated controls.
  • Monozygotic twins showed significantly higher concordance than dizygotic twins for mesiodistal tooth dimensions.
  • Digitized occlusal surfaces revealed higher similarity in MZ twins (147 µm deviation) than DZ twins (209 µm) and controls (258 µm).

    • Conclusions:

    • High similarity in tooth size and morphology among monozygotic twins suggests a strong genetic component.
    • Dental traits like tooth size and shape may serve as supplementary indicators for zygosity determination.