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ORIGINAL RESEARCH Table of Contents   
Year : 2012  |  Volume : 23  |  Issue : 4  |  Page : 501-505
Distraction-like phenomena in maxillary bone due to application of orthodontic forces in ovariectomized rats


1 Department of Orthodontics, School of Dentistry, University of Athens, Greece, and Adjunct Associate Professor, Department of Orthodontics, School of Dental Medicine, Case Western Reserve University, Cleveland, Ohio, USA
2 Department of Pathology, Amalia Fleming Hospital, Athens, Greece, and Laboratory for Research of the Musculoskeletal System, School of Medicine, University of Athens, Greece
3 Department of Orthodontics, School of Dentistry, University of Athens, Greece
4 Laboratory for Research of the Musculoskeletal System, School of Medicine, University of Athens, Greece, and Laboratory of Experimental Surgery and Surgical Research, School of Medicine, University of Athens, Greece

Correspondence Address:
Apostolos I Tsolakis
Department of Orthodontics, School of Dentistry, University of Athens, Greece, and Adjunct Associate Professor, Department of Orthodontics, School of Dental Medicine, Case Western Reserve University, Cleveland, Ohio, USA

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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-9290.104958

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Background: Orthodontic forces may not only influence the dentoalveolar system, but also the adjacent and surrounding cortical bone. Aim: Since there is very limited information on this issue, we aimed to study the possible changes in maxillary cortical bone following the application of heavy orthodontic forces in mature normal and osteoporotic rats. Materials and Methods: Twenty-four 6-month-old female rats were selected and divided into an ovariectomized group and a normal group. In both groups, the rats were subjected to a 60 gr* orthodontic force on the upper right first molar for 14 days. Results: In both groups, histological sections showed that the application of this force caused hypertrophy and fatigue failure of the cortical maxillary bone. The osteogenic reaction to distraction is expressed by the formation of subperiosteal callus on the outer bony side, resembling that seen in distracted bones. Conclusion: From this study we concluded that heavy experimental orthodontic forces in rats affect the maxillary cortical bone. The osteogenic reaction to these forces, expressed histologically by subperiosteal callus formation, is similar to that seen in distraction osteogenesis models.


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