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Related Experiment Videos

Linear and angular changes in dento-facial dimensions in the third decade.

J S Gormely1, M E Richardson

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

British Journal of Orthodontics
|May 20, 1999
PubMed
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Dento-facial dimensions showed minor changes in the third decade of life. Skeletal and dental relationships remained stable, with slight increases in face height and jaw length.

Area of Science:

  • Dentistry
  • Orthodontics
  • Craniofacial Biology

Background:

  • Understanding long-term changes in dento-facial morphology is crucial for orthodontic and surgical planning.
  • The third decade of life (ages 18-28) represents a period where significant facial growth has typically ceased, but subtle changes may still occur.

Purpose of the Study:

  • To investigate alterations in dento-facial dimensions and relationships during the third decade of life.
  • To assess the stability of skeletal and dental parameters from late adolescence through young adulthood.

Main Methods:

  • A prospective cephalometric study design was employed.
  • Lateral cephalometric radiographs were taken at three time points (T1: 18 years, T2: 21 years, T3: 28 years) for a cohort of 21 males and 26 females.

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  • Measurements of various dento-facial dimensions and relationships were analyzed, with changes calculated and tested for statistical significance using one-sample t-tests.

    • Main Results:

    • Overall, skeletal and dental relationships demonstrated relative stability throughout the observation period.
    • A statistically significant, though small, increase was observed in overall face height.
    • Jaw length dimensions also showed a slight, but measurable, increase over the third decade.

    Conclusions:

    • Dento-facial morphology is largely stable during the third decade of life.
    • Minor increases in facial height and jaw length occur, indicating continued, albeit slow, development or adaptation.
    • These findings have implications for long-term treatment planning and outcome prediction in orthodontics and dentofacial orthopedics.