fa Periodontal microstructure change and tooth movement pattern under different force magnitudes in ovariectomized rats: An in-vivo microcomputed tomography study ارتودنسی Orthodontics پژوهشي Research <p> <strong>Introduction</strong></p><p>  The purpose of this study was to evaluate the dynamic changes in the periodontal microstructure and the molar displacement pattern during orthodontic tooth movement in ovariectomized rats.</p><p> <strong> Methods</strong></p><p>  Twenty ovariectomized rats received either 100 or 30 g of orthodontic force to induce mesial movement of the maxillary left first molars over 14 days. Ten healthy rats underwent sham operations as controls. Periodontal ligament thickness, alveolar bone microstructural properties, and displacement of the molar were measured with 6 in-vivo microcomputed tomography scans for each sample. </p><p> <strong>Results</strong></p><p>  The ovariectomized rats that received 100 g of orthodontic force had obvious changes in periodontal ligament thickness at day 1 and poor periodontal ligament thickness recovery from days 5 through 14. The bone volume fraction increased and the trabecular separation decreased significantly in this group at day 3, and obvious bone loss was observed at day 14. Molar linear and angular movements were also higher in this group than in the other 2 groups. </p><p> <strong>Conclusions</strong></p><p>  Relatively heavier force applications in ovariectomized rats resulted in poor periodontal ligament thickness recovery and local alveolar bone overcompression, and consequently induced undermining resorption and obvious alveolar bone loss these led to high rates of tooth movement and molar inclination. </p><hr><p></p><p> <strong>Source: </strong>American Journal of Orthodontics & Dentofacial Orthopedics </p><p> <a href="http://www.ajodo.org/article/S0889-5406(13)00251-5/abstract" target="_blank"><font color="#0000ff">Full Text</font></a></p> 0 0 http://idai.ir/browse.php?a_code=A-10-32-1802&slc_lang=fa&sid=1 Yigi Xu 10031947532846008490 10031947532846008490 No Department of Orthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China Tangmin Zhao 10031947532846008491 10031947532846008491 No Department of Stomatology, Urumqi General Hospital of People's Liberation Army, Urumqi, China Wenjuan Xu 10031947532846008492 10031947532846008492 No Medical Department, Urumqi General Hospital of People's Liberation Army, Urumqi, China Yin Ding 10031947532846008493 10031947532846008493 Yes Department of Orthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China