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Med Sci Monit ; 27: e935851, 2021 12 17.
Artigo em Inglês | MEDLINE | ID: mdl-34916481


This publication has been retracted by the Editor due to the identification of non-original figure images and manuscript content that raise concerns regarding the credibility and originality of the study and the manuscript. Reference: Jianping Zhou, Fengxue Yang, Xiaolin Xu, Gang Feng, Jun Chen, Jinglin Song, Hongwei Dai. Dynamic Evaluation of Orthodontically-Induced Tooth Movement, Root Resorption, and Alveolar Bone Remodeling in Rats by in Vivo Micro-Computed Tomography. Med Sci Monit, 2018; 24: 8306-8314. DOI: 10.12659/MSM.912470.

Med Sci Monit ; 24: 8306-8314, 2018 11 18.
Artigo em Inglês | MEDLINE | ID: mdl-30448850


BACKGROUND The aim of this study was to dynamically evaluate tooth movement, root resorption, and remodeling of alveolar bone using different forces to cause tooth movement in rats. MATERIAL AND METHODS 12-week-old male Sprague-Dawley rats were selected. Nickel-titanium (Ni-Ti) coil springs (20 g, 50 g, and 100 g forces) were placed for mesial movement of the left first maxillary molar teeth. Tooth movement, root resorption, and microarchitectural parameters of the trabecular bone were evaluated by in vivo micro-CT. Histological examination was used to observe the root resorption, alveolar bone remodeling, and changes in osteoclasts from day 0 to day 14. RESULTS The tooth movement distance increased significantly over the initial 3 days in the 3 groups. The 20 g force group showed more tooth movement than in the 50 and 100 g force groups after 14 days (P<0.05). From days 7 to 10, root resorption lacunae appeared in the 3 groups and then stabilized, and the 100 g force group produced more lacunar resorption than in the anther 2 groups (P<0.05). Compared to day 0, the trabecular thickness and bone volume fraction on the pressure side gradually decreased from day 7 to day 14. The structure model index increased significantly from day 3 to day 14. Histological examination showed remarkable root resorption craters and osteoclasts positive for tartrate-resistant acid phosphatase in the root resorption lacunae in the 50 g and 100 g groups from day 7 to day 14. CONCLUSIONS A 100 g heavy force can be used to establish a root resorption model in rats.

Perda do Osso Alveolar/diagnóstico por imagem , Reabsorção da Raiz/diagnóstico por imagem , Mobilidade Dentária/diagnóstico por imagem , Técnicas de Movimentação Dentária/instrumentação , Perda do Osso Alveolar/patologia , Animais , Remodelação Óssea/fisiologia , Reabsorção Óssea/patologia , Masculino , Maxila/patologia , Dente Molar/patologia , Osteoclastos/patologia , Ratos , Ratos Sprague-Dawley , Reabsorção da Raiz/patologia , Mobilidade Dentária/patologia , Raiz Dentária/patologia
PLoS One ; 11(3): e0150135, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26930605


OBJECTIVE: To observe dynamic changes in root resorption repair, tooth movement relapse and alveolar bone microstructure following the application of orthodontic force. MATERIALS AND METHODS: Forces of 20 g, 50 g or 100 g were delivered to the left maxillary first molars of fifteen 10-week-old rats for 14 days. Each rat was subjected to micro-computed tomography scanning at 0, 3, 7, 10, 14, 28 and 42 days after force removal. The root resorption crater volume, tooth movement relapse and alveolar bone microarchitecture were measured at each time point. RESULTS: From day 3 to day 14, the root resorption volume decreased significantly in each group. In the 20-g force group, the root resorption volume gradually stabilized after 14 days, whereas in the 50-g and 100-g force groups, it stabilized after 28 days. In all groups, tooth movement relapsed significantly from day 0 to day 14 and then remained stable. From day 3 to day 10, the 20-g group exhibited faster relapse than the 50-g and 100-g groups. In all groups, the structure model index and trabecular separation decreased slowly from day 0 to day 10 and eventually stabilized. Trabecular number increased slowly from day 0 to day 7 and then stabilized. CONCLUSIONS: The initial stage of root resorption repair did not change significantly and was followed by a dramatic repair period before stabilizing. The most serious tooth movement relapse occurred immediately after the appliance was removed, and then the tooth completely returned to the original position.

Osso e Ossos/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Reabsorção da Raiz/diagnóstico por imagem , Técnicas de Movimentação Dentária , Raiz Dentária/diagnóstico por imagem , Animais , Masculino , Radiografia , Ratos , Ratos Sprague-Dawley