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Related Experiment Videos

The saddle angle: constancy or change?

A B Lewis, A F Roche

    The Angle Orthodontist
    |January 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    The cranial base saddle angle (Ba-S-N) significantly decreases in the first two years of life, with later changes being minimal. Individual variations exist, but the angle shows relative constancy after age two.

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    Area of Science:

    • Orthodontics
    • Craniofacial development
    • Pediatric cephalometrics

    Background:

    • The saddle angle (Ba-S-N) is a key indicator of cranial base angulation.
    • Understanding age-associated changes in this angle is crucial for diagnosing and treating malocclusions.

    Purpose of the Study:

    • To analyze age-associated changes in the saddle angle (Ba-S-N) in children.
    • To investigate variations in these changes based on occlusion class and sex.

    Main Methods:

    • Serial cephalometric radiographs of 165 children were analyzed.
    • Age-associated changes in the saddle angle (Ba-S-N) were measured and compared across different age groups and occlusion classes.

    Main Results:

    • A mean decrease of approximately 5 degrees in the saddle angle was observed from birth to 2 years for both Class I and Class II occlusions.

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  • Later changes were slight, with some sex-related differences noted.
  • The angle showed marked constancy within individuals after age 2, despite variability at specific ages and occasional large decreases in some individuals.

    • Conclusions:

    • Cranial base flexure, indicated by the saddle angle, predominantly changes in the first two years of life.
    • While individual variability exists, the relative saddle angle remains consistent within individuals after early childhood.
    • The findings provide insights into normal craniofacial growth patterns and potential variations in relation to occlusion.