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3D Imaging of PDL Collagen Fibers during Orthodontic Tooth Movement in Mandibular Murine Model
Published on: April 15, 2021
Initial pulp changes during orthodontic movement: histomorphological evaluation
Milton Santamaria1, Débora Milagres, Mamie Mizusaki Iyomasa
1Department of Orthodontics and Pediatric Dentistry, School of Dentistry, Federal University of Rio de Janeiro, RJ, Brazil. santamariajr@mailcity.com
Brazilian Dental Journal
|July 20, 2007
Summary
Tooth movement causes inflammatory changes in the dental pulp, including odontoblast alterations and edema. These pulpal tissue changes are reversible if the applied force remains within physiological limits.
Area of Science:
- Orthodontics
- Dental Histology
- Periodontology
Background:
- Orthodontic tooth movement involves applying forces to reposition teeth.
- Understanding the pulpal response to orthodontic forces is crucial for preventing damage.
Purpose of the Study:
- To evaluate histological changes in the dental pulp of rat molars subjected to controlled orthodontic force.
- To assess the reversibility of pulpal alterations following tooth movement.
Main Methods:
- Wistar rats underwent mesial inclination of maxillary first molars using a nickel-titanium coil spring (0.4 N force).
- Histological analysis (hematoxylin and eosin staining) of dental pulp was performed at 6, 12, 24, and 72 hours post-force application.
- A control group received no force application.
Main Results:
- Observed alterations included odontoblast layer changes (hypertrophy), pulp connective tissue edema, and vascular changes (erythrocyte and leukocyte accumulation).
- These inflammatory signs were most pronounced in the mesial root area.
- Changes were less severe at the 72-hour mark, suggesting a degree of reversibility.
Conclusions:
- Orthodontic tooth movement induces pulpal tissue alterations consistent with an inflammatory process.
- These pulpal responses are likely reversible if the applied force does not exceed the tissue's physiological tolerance limit.
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