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Related Experiment Videos

Lower arch crowding in the third decade

M E Richardson1, J S Gormley

  • 1Department of Orthodontics, Royal Hospitals, School of Dentistry, Belfast, Northern Ireland.

European Journal of Orthodontics
|November 24, 1998
PubMed
Summary
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Untreated lower arch crowding and dimensions showed minimal changes between ages 18 and 28. These slight variations were often not clinically significant, suggesting stability in the untreated adult lower arch.

Area of Science:

  • Orthodontics
  • Dental Morphology
  • Craniofacial Development

Background:

  • Understanding the natural progression of lower arch crowding and dimensions is crucial for orthodontic diagnosis and treatment planning.
  • Longitudinal data on untreated adult dental arches are essential for establishing normative growth and stability patterns.

Purpose of the Study:

  • To assess changes in lower arch crowding and dimensions in untreated individuals from late adolescence to adulthood.
  • To determine the clinical significance of observed changes in the untreated lower dental arch over time.

Main Methods:

  • Measurements of lower arch crowding and dimensions were taken from dental study models.
  • Data were collected from 46 untreated subjects (20 males, 26 females) at ages 18, 21, and 28 years.

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  • Changes were calculated over the observation periods.

    • Main Results:

    • Only very small changes in lower arch crowding and dimensions were observed.
    • Few of the detected changes were clinically significant.
    • The findings indicate a high degree of stability in the untreated adult lower arch.

    Conclusions:

    • The adult lower dental arch exhibits considerable stability with minimal changes in crowding and dimensions.
    • These findings contribute to the understanding of natural dental arch changes and can inform orthodontic treatment decisions and retention strategies.