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Related Experiment Videos

Postnatal width changes in the internal structures of the human mandible: a longitudinal three-dimensional

S Baumrind1, E L Korn

  • 1Department of Growth and Development, University of California, San Francisco.

European Journal of Orthodontics
|December 1, 1992
PubMed
Summary

This study shows metallic implants in the mandible of growing humans systematically move apart. This challenges the long-held belief that the mandible

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Area of Science:

  • Orthodontics
  • Human Growth and Development
  • Biomechanical Engineering

Background:

  • Traditional beliefs suggest mandibular symphysis fusion and dimensional constancy after the first year of life.
  • Previous research indicated statistically significant transverse displacement of metallic implants in the mandibular body region for some subjects.
  • This study investigates concurrent ramus changes to further understand mandibular growth dynamics.

Purpose of the Study:

  • To present quantitative evidence of systematic lateral displacement of metallic implants in the mandible during human growth.
  • To assess the consistency of this displacement with inferred increases in distance between internal mandibular structures.
  • To challenge traditional assumptions about mandibular symphysis fusion and dimensional stability.

Main Methods:

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  • Longitudinal analysis of case-specific quantitative data from metallic implants in human mandibles.
  • Subjects ranged from 8.5 to 15.5 years of age.
  • Concurrent analysis of mandibular body and ramus changes.

Main Results:

  • Statistically significant lateral displacement (widening) of metallic implants was observed in the mandibular body for 11 of 12 subjects.
  • Concurrent statistically significant widening was also observed in the ramus region for 8 of these 11 subjects.
  • No subject showed ramus widening without concurrent body widening, and no trans-ramus narrowing was detected.

Conclusions:

  • The findings provide quantitative evidence supporting systematic lateral displacement and widening in the human mandible during growth.
  • This contradicts the traditional view of mandibular symphysis fusion and dimensional constancy.
  • The observed changes in both the body and ramus suggest a coordinated growth process influencing mandibular width.