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Transitional structures in lamellar bone

V Ziv1, I Sabanay, T Arad

  • 1Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel.

Microscopy Research and Technique
|February 1, 1996
PubMed
Summary
This summary is machine-generated.

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Bone lamellar structure is more complex than a simple plywood model. Transition zones show intermediate collagen and mineral orientations, suggesting a single depositional cycle for lamellar bone formation.

Area of Science:

  • Biomineralization
  • Bone Biology
  • Materials Science

Background:

  • Lamellar bone exhibits a structure interpreted as a rotated plywood model with alternating collagen and mineral orientations.
  • This model is challenged by observations of transition zones with intermediate orientations in various bone types.

Purpose of the Study:

  • To investigate the structural complexity of lamellar bone beyond the traditional plywood model.
  • To provide evidence for intermediate collagen fibril and mineral crystal orientations within bone lamellae.

Main Methods:

  • Scanning electron microscopy (SEM) of fractured bone surfaces.
  • Vitrified cryo-sections of demineralized bone for collagen fibril analysis.
  • Transmission electron microscopy (TEM) and electron diffraction of bone fragments for crystal orientation.

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Main Results:

  • SEM revealed transition zones with intermediate orientations between lamellae.
  • Cryo-sections showed graded collagen fibril lengths and orientations in transition zones.
  • TEM and electron diffraction confirmed intermediate mineral crystal orientations.

Conclusions:

  • The traditional rotated plywood model of lamellar bone is an oversimplification.
  • Transition zones with intermediate orientations are integral to lamellar bone structure.
  • Lamellar bone formation likely involves a single depositional cycle with varying collagen orientations before mineralization.