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Related Experiment Videos

Computer comparison of bitemark patterns in identical twins

R F Sognnaes, R D Rawson, B M Gratt

    Journal of the American Dental Association (1939)
    |September 1, 1982
    PubMed
    Summary

    Even identical twins possess unique dental patterns. This study found significant variations in tooth arrangement and rotation, proving no two individuals, including identical twins, have identical dental fingerprints.

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    Area of Science:

    • Forensic odontology
    • Human genetics
    • Biometrics

    Background:

    • Monzygotic (identical) twins share nearly identical DNA.
    • Dental morphology is influenced by genetics but also by environmental factors.
    • Forensic identification relies on unique individual characteristics.

    Purpose of the Study:

    • To investigate the uniqueness of dental patterns in identical twins.
    • To determine if dental arch form and tooth position are identical in monozygotic twins.
    • To assess the potential of dental records for individual identification, even in twins.

    Main Methods:

    • Epoxy models of twin dentition were created.
    • Experimental tooth indentations (bitemarks) were made on the models.
    • Radiographic contact profiles of bitemarks were generated.

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  • Computerized comparison of bitemark patterns was performed.

    • Main Results:

    • Significant variations in anterior tooth arrangement and rotation were observed between twins.
    • Dental arch forms and individual tooth positions differed distinctly.
    • Some twin pairs exhibited mirror-image bitemark patterns.
    • Computer analysis confirmed non-identity in dental arch form and tooth positioning.

    Conclusions:

    • Dental arch form and individual tooth positions are not identical even in monozygotic twins.
    • Dental characteristics offer a reliable basis for individual identification.
    • Forensic odontology can differentiate between identical twins based on dental evidence.