RESUMO
OBJECTIVE: The aim of this study was to evaluate the cephalometric results of distraction osteogenesis in patients with premaxillary deficiency. MATERIAL AND METHODS: In this study, an individual tooth-borne distraction device was used for advancement of the maxillary anterior segment. Unilateral or bilateral distraction was performed for 7 patients, according to the specific requirements of the individuals. Cephalometric radiographs were taken before treatment (T0), after distraction (T1), and after consolidation for 8 weeks (T2). RESULTS: Cephalometric analysis revealed that the premaxilla was moved forward and upward and the length of palatal plane increased. CONCLUSION: These alterations improved the soft tissue profile and solved the space deficiency of the maxilla by increasing the arch perimeter.
Assuntos
Cefalometria , Má Oclusão Classe III de Angle/cirurgia , Maxila/anormalidades , Procedimentos Cirúrgicos Bucais/métodos , Osteogênese por Distração/métodos , Retrognatismo/cirurgia , Adolescente , Arco Dental/cirurgia , Feminino , Humanos , Masculino , Maxila/cirurgia , Avaliação de Resultados em Cuidados de Saúde/métodos , Estudos Prospectivos , Estatísticas não ParamétricasRESUMO
OBJECTIVE: To determine the effects of interferon-gamma (IFN-gamma) on bone remodeling during orthodontic tooth movement. MATERIALS AND METHODS: Thirty adult male Sprague Dawley rats were randomly categorized into five groups. IFN-gamma was administered in three different doses (0.01, 0.02, and 0.05 microg/20 microL) and the remaining two groups served as control. Mandibular first molars were moved mesially by means of Ni-Ti closed coil springs in all groups. The results were evaluated histomorphometrically, and parameters of trabecular bone volume (BV/TV), trabecular bone number (Tr.N), and trabecular separation (Tr.Sep) were observed at the interradicular bone area of the mandibular first molars. RESULTS: Increases in BV/TV and Tr.N and decreases in Tr.Sep revealed the antiosteoclastic activity of IFN-gamma. CONCLUSION: IFN-gamma administration may be useful clinically for anchorage control.
Assuntos
Remodelação Óssea/efeitos dos fármacos , Interferon gama/farmacologia , Interferon gama/fisiologia , Osteoclastos/efeitos dos fármacos , Técnicas de Movimentação Dentária , Animais , Densidade Óssea , Análise do Estresse Dentário , Masculino , Mandíbula , Dente Molar , Aparelhos Ortodônticos , Distribuição Aleatória , Ratos , Ratos Sprague-Dawley , Proteínas Recombinantes , Técnicas de Movimentação Dentária/instrumentaçãoRESUMO
Rapid canine distalization is a technique involving periodontal ligament distraction. The primary aim of this technique is to distalize the canines without anchorage loss and to shorten the duration of orthodontic treatment. After the rapid canine distalization, the healing process of the periodontal ligament is similar to rapid palatal expansion and requires a consolidation period. The long consolidation period of the technique conflicts with the second aim. Skeletal anchorage systems seem to compensate for this conflict because they can be also used for retraction of incisors during consolidation period. This case report presents the orthodontic treatment of a 16-year-old female, who had a bimaxillary retrusion and a dental Class II division I malocclusion. Upper first premolars were extracted and, while the canines were being distalized rapidly by periodontal ligament distraction, the incisors were retracted using a zygomatic anchorage system. The treatment of the patient was completed in five months without any anchorage loss.
