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Related Experiment Videos

Age-related differences in mandibular ramus growth: a histologic study

M G Hans1, D H Enlow, R Noachtar

  • 1Department of Orthodontics, Case Western Reserve University School of Dentistry, Cleveland, OH 44106-4905, USA.

The Angle Orthodontist
|January 1, 1995
PubMed
Summary

Mandibular ramus remodeling exhibits diverse patterns beyond the classic type, impacting orthopedic treatment outcomes. These variations in bone deposition and resorption are not directly linked to dental age.

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Area of Science:

  • Orthodontics and Dental Anthropology
  • Craniofacial Development
  • Bone Biology

Background:

  • Mandibular ramus and corpus morphogenic relationships are crucial for establishing mandibular arch position.
  • Understanding variations in mandibular remodeling is essential for comprehending craniofacial development.

Purpose of the Study:

  • To investigate and categorize different patterns of mandibular ramus remodeling.
  • To assess the significance of these variations in relation to established models and potential clinical implications.

Main Methods:

  • Histologic analysis of ground and polished microscopic sections from 30 human mandibles (dental age 1-13 years).
  • Recording the distribution of endosteal and periosteal bone tissues and resorptive/depository surfaces.
  • Classifying observed remodeling patterns into distinct types (A, B, and C).

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Main Results:

  • Three distinct patterns of mandibular ramus remodeling were identified: Type A (classic), Type B (vertical variation), and Type C (rotation variation).
  • The classic pattern (Type A) was observed in 14 specimens, with variations (Type B and C) present in the remaining mandibles across all examined ages.
  • Significant differences in remodeling patterns suggest that a single, common description is insufficient.

Conclusions:

  • Mandibular ramus remodeling is more complex than previously described, with multiple variations existing.
  • Observed remodeling patterns do not correlate strongly with dental age, suggesting other factors influence development.
  • These distinct remodeling patterns have the potential to influence the outcomes of mandibular orthopedic treatments.