ABSTRACT
Abstract This study aimed to evaluate the effects of chronic use of fluoxetine on the amount of orthodontic tooth movement and tissue changes in rats. A total of 192 Wistar rats were divided into 4 groups: S, 0.9% saline solution; F, 20 mg/kg of fluoxetine; SM, 0.9% saline solution with orthodontic movement; and FM, 20 mg/kg of fluoxetine with orthodontic movement. After 30 days of daily saline or fluoxetine administration, an orthodontic device (25cN) was used to mesially displace the first molar in animals of the groups SM and FM. The animals were euthanized 2, 7, 14, and 28 days after placement of the orthodontic appliances and animals of groups S and F were euthanized at the same time. The assessment of tooth movement was made in gypsum castings, the collagen neoformation was assessed by polarization microscopy, the number of osteoclasts and root resorption were evaluated using tartrate-resistant acid phosphatase, and presence of hyalinized areas was assessed by hematoxylin-eosin staining. Fluoxetine did not affect the amount of tooth displacement, percentage of collagen, number of osteoclasts, and presence of hyalinized areas (P>0.05). There was a higher frequency of root resorption areas in the FM group than in the SM group only on the second day (P<0.05). The findings of this study show that chronic use of 20 mg/kg fluoxetine does not affect the amount of tooth movement, collagen neoformation, number of osteoclasts, or hyalinized areas and does not affect root resorption until the last day of orthodontic movement.
ABSTRACT
ABSTRACT Objective: This article describes the orthodontic treatment performed on an adult patient with multiple dental losses. Case report: A female patient, 20 years and 4 months old, presented with the following conditions: absence of teeth #26, #35, #36 and #46; semi-impacted tooth #48; inclined molars adjacent to an edentulous space; canines and premolars in a Class II relationship; a convex profile; biprotrusion; and forced lip sealing. Results: Space in the region of tooth #26 was closed, as well the space of tooth #46; tooth #48 erupted and followed mesial movement passively; space of the region of tooth #35 was maintained for the placement of a dental implant; uprighting of tooth #37 was obtained. Aesthetic and functional goals of the treatment were achieved. Results remained stable 10 years after the end of the treatment. Conclusion: The modified helical loop could be effectively used in orthodontic mechanics to close edentulous spaces. Passive semi-impacted mandibular third molar eruption and mesialization can occur in adults when proper space is provided.
RESUMO Objetivo: o presente artigo descreve o tratamento ortodôntico realizado em uma paciente adulta que apresentava múltiplas perdas dentárias. Relato do caso: paciente do sexo feminino com 20 anos e 4 meses de idade, apresentava as seguintes condições: ausência dos dentes #26, #35, #36 e #46; dente #48 semi-impactado; molares adjacentes ao espaço edentado inclinados; relação Classe II de caninos e pré-molares; perfil convexo; biprotrusão; selamento labial forçado. Resultados: foram obtidos o fechamento do espaço da região do dente #26, assim como do #46; o dente #48 irrompeu e acompanhou esse movimento mesial; manutenção do espaço da região do dente #35 para colocação de implante dentário; e verticalização do dente #37. Os objetivos estéticos e funcionais do tratamento foram alcançados. Os resultados alcançados permaneceram estáveis 10 anos após o fim do tratamento. Conclusão: a alça helicoidal modificada pode ser efetivamente usada na mecânica ortodôntica para fechar espaços edêntulos. A erupção passiva e a mesialização de terceiro molar mandibular semi-impactado podem ocorrer em adultos, quando espaço adequado é obtido.