Three-dimensional morphology of root and alveolar trabecular bone during tooth movement using micro-computed tomography

摘要

Objective: To investigate the effects of force magnitude on three-dimensional alveolar trabecular bone structure and root resorption. Materials and Methods: Twenty-two 11-week-old Sprague Dawley rats were randomly assigned to two groups that received a mesially directed orthodontic force to the upper right first molars at different magnitudes of force, 30?g or 100?g, for 2?weeks. The contralateral molars served as controls. The teeth and alveolar bone around the teeth were dissected from the sacrificed animals and were scanned with micro-computed tomography (CT). Structural properties of the trabecular bone and resorption crater volume on the mesial roots of the maxillary first molars were analyzed. Results: The bone volume fraction of the 30?g group and the 100?g group increased significantly in both groups, and trabecular separation of the 100?g group decreased significantly compared with controls (P P P Conclusion: The alveolar trabecular bone was denser after orthodontic force was applied for 14?days. The effects of 30?g and 100?g orthodontic forces on root resorption were different at the upper mesial and lower distal surfaces of the mesial roots of maxillary first molars.