Korean J Orthod.  1989 Jul;19(2):37-55.

An electron microscopic study on the alveolar bone remodelling in pressure zones of rat molar periodontium associated with orthodontic tooth movement

Affiliations
  • 1Department of Orthodontics, College of Dentistry, Kyung Hee University, Korea.

Abstract

The tissue reactions concerned in alveolar bone remodelling at the pressure zones of rat molar periodontium associated with the application of force (15 gm) to the maxillary first molar teeth of the albino rats were studied by the transmission electron microscopy. Osteoclasts referrable to bone resorption were observed thereafter 3 hour survival period and undermining resorption was generated thenceforth 2 day survival period. Bone resorption, reversal zone and new bone formation were simultaneously observed adjacent to the zone of undermining resorption in the 7 day survival period. Osteoclasts with well developed primary lysosome, ruffled border, clear zone, granules and Golgi apparatus were detected at the zone of the bone resorption, and dark and bright cells adjacent to the osteoclasts as well. Mononuclear cells and perpendicularly arranged collagenous fibers were observed in the reversal zone and, on the other hand, osteoblasts with well developed Golgi apparatus and rough endoplasmic reticulum were detected at the zone of bone formation.


MeSH Terms

Animals
Bone Resorption
Collagen
Endoplasmic Reticulum, Rough
Golgi Apparatus
Hand
Lysosomes
Microscopy, Electron, Transmission
Molar*
Osteoblasts
Osteoclasts
Osteogenesis
Periodontium*
Rats*
Tooth Movement*
Tooth*
Collagen
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