The ligament changes during tooth movement - a histological and radioautographic interpretation
Date
1975
DOI
Authors
Randall, Frederick L.
Version
OA Version
Citation
Abstract
The purpose of this project was to study the possible adjustments within the fibrous structure of the periodontal ligament during tooth movement.
After the incorporation of tritiated proline, radioautographic analysis was utilized to assess the magnitude of proliferative response of the periodontal ligament collagen in rats following tooth movement of 7 and 14 days and after a 7 day relapse period.
When the periodontal ligaments of the experimental animals were compared to their respective controls, a marked increase in labelling was noted at each of the time periods, all with a high level of significance.
A further comparison of the experimental animals with each other at different time periods showed only a slight increase in labelling from the seventh to fourteenth day, and a 20% reduction in the amount of radioactivity from the time the activated spring is removed (14th day) until the end of the relapse period (21st day). In fact, the decrease fell below the level observed after the first seven days of tooth movement.
It was also found that there was considerably more incorporation of the radioactive proline on the tension side than on the pressure side. This being consistent with the theory that little collagen synthesis is found on the pressure side, but is indispensable on the tension side as a precursor to bone and ligament.
Lastly, there was no evidence of an "intermediate plexus."
Description
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Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry (Orthodontics), 1976.
Includes bibliography.
Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry (Orthodontics), 1976.
Includes bibliography.
License
This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.