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Histomorphometric study of dental pulp during orthodontic tooth movement
C E Nixon1, J A Saviano, G J King
1University of Florida Health Science Center, Department of Endodontics, Gainesville.
Journal of Endodontics
|January 1, 1993
Summary
Orthodontic tooth movement increases dental pulp vascularity and predentin width over time. Force magnitude influences these changes, with higher forces causing more significant effects on pulp tissue.
Area of Science:
- Dental Research
- Orthodontics
- Histomorphometry
Background:
- Orthodontic tooth movement can induce secondary changes within the dental pulp.
- Understanding these pulpal responses is crucial for safe and effective orthodontic treatment.
Purpose of the Study:
- To histomorphometrically correlate the effects of varying orthodontic force magnitudes on dental pulp parameters.
- To investigate the relationship between applied force and pulpal changes during tooth movement.
Main Methods:
- Four groups of Sprague-Dawley rats (n=36 per group) were subjected to orthodontic forces (20, 40, 60g) or sham treatment.
- Maxillary first molars were mesially tipped over 14 days, with specimens collected at set intervals.
- Pulpal vascularity (capillary number) and predentin width were measured using histomorphometry and image analysis.
Main Results:
- A significant, time- and force-dependent increase in pulpal capillary number was observed (p < 0.05).
- Initial pulpal hyperemia occurred irrespective of force magnitude.
- A force-dependent increase in predentin width was noted at the peak of tooth movement.
Conclusions:
- Orthodontic forces induce measurable changes in dental pulp vascularity and predentin width.
- These pulpal responses are influenced by both the duration and magnitude of the applied orthodontic force.