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Related Experiment Videos

Linear changes of the maxillary and mandibular lips.

A H Mamandras1

  • 1Undergraduate Orthodontic Programme, Faculty of Dentistry, University of Western Ontario, London, Canada.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|November 1, 1988
PubMed
Summary

Human lip dimensions increase with age during growth. Male lip growth in length and thickness was proportionally and numerically greater than in females from childhood to adulthood.

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Area of Science:

  • Orthodontics and Dentofacial Orthopedics
  • Human Growth and Development
  • Anthropometry

Background:

  • Understanding craniofacial growth is crucial in orthodontics.
  • Lip morphology significantly influences facial aesthetics and function.
  • Longitudinal data on lip dimension changes during adolescence is limited.

Purpose of the Study:

  • To evaluate the growth effects on linear lip dimensions from childhood to adulthood.
  • To quantify changes in lip length and thickness during adolescent development.
  • To compare lip growth patterns between males and females.

Main Methods:

  • Serial computerized cephalometry was employed for precise measurements.
  • Thirty-two untreated subjects (male and female) aged 8 to 18 years were studied.

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  • Longitudinal tracking of maxillary and mandibular lip dimensions was performed.

    • Main Results:

    • Both lip length and thickness showed significant increases with age in both sexes.
    • Lip dimensions demonstrated continuous growth throughout the studied period (8-18 years).
    • Males exhibited proportionally and numerically greater increases in lip length and thickness compared to females.

    Conclusions:

    • Human lip dimensions undergo substantial growth from childhood to adulthood.
    • Significant sexual dimorphism exists in adolescent lip growth patterns.
    • These findings provide valuable normative data for orthodontic diagnosis and treatment planning.