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Describing shape changes in the human mandible using elliptical Fourier functions.

S Y Chen1, P E Lestrel, W J Kerr

  • 1University of Glasgow Dental School, Scotland, UK.

European Journal of Orthodontics
|August 2, 2000
PubMed
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Elliptical Fourier functions accurately mapped mandibular shape changes in growing individuals. Significant mandibular development, particularly in the lower incisor and gonial angle areas, occurred between ages 11 and 15, coinciding with puberty.

Area of Science:

  • Biomorphometrics
  • Human Growth and Development
  • Orthodontics

Background:

  • Understanding mandibular growth is crucial for diagnosing and treating dentofacial abnormalities.
  • Previous studies have utilized various methods to analyze craniofacial development.

Purpose of the Study:

  • To quantitatively analyze changes in mandibular shape during growth using Elliptical Fourier functions (EFF).
  • To identify specific areas of mandibular morphology that undergo significant changes during puberty.

Main Methods:

  • Elliptical Fourier functions (EFF) were applied to the mandibular outlines of 24 subjects at ages 9, 11, 13, and 15.
  • Area standardization and centroid superimposition were used for comparative shape analysis.
  • Residual fit analysis confirmed the accuracy of the EFF model (mean residual fit 0.11 mm).

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Main Results:

  • No significant mandibular shape changes were detected between ages 9 and 11 years.
  • Between ages 11 and 15 years, significant shape alterations were observed in the lower incisor, mental, mandibular body, and gonial angle regions.
  • These observed changes in mandibular morphology align with the pubertal growth spurt.

Conclusions:

  • Elliptical Fourier functions provide an accurate method for quantifying mandibular shape changes during adolescent growth.
  • The pubertal growth spurt significantly influences specific regions of the mandible, including the lower incisor and gonial angle.
  • These findings contribute to a better understanding of normal mandibular development and can inform orthodontic treatment planning.