ABSTRACT
A maloclusão Classe III é desafiadora para a prática ortodôntica devido a etiologia multifatorial e a imprevisibilidade do crescimento do complexo craniofacial. Inúmeros perfis esqueléticos e dentários associados as maloclusões Classe III podem ser resultantes do prognatismo mandibular, retrusão maxilar ou associação de ambos. Ao final do crescimento, o tratamento destas alterações limita-se à compensação dentária ou ao tratamento ortodôntico-cirúrgico. Este artigo apresenta o caso clínico de uma paciente com maloclusão esquelética e dentária Classe III, conduzida ao tratamento ortocirúrgico convencional em decorrência da impossibilidade de camuflagem ortodôntica, com realização de osteotomias combinadas dos maxilares, visando a perspectiva de melhoria estética e funcional. Os dados foram coletados por meio de revisão do prontuário, modelos de estudo, radiografias, tomografia cone beam e registros fotográficos intra e extrabucais. O tratamento proposto proporcionou resultados funcional e estético almejados, com adequada intercuspidação entre os arcos dentários, aumento de volume na região do terço médio da face e redução da projeção do mento no perfil.
Class III maloclusions are challenging for clinical orthodontics due to its multifactorial etiology and the craniofacial growth's unpredictability. Numerous skeletal and dental profiles associated with Class III maloclusions can result from mandibular prognathism, maxillary retrusion or association of both. After growth is ceased, treatment of these conditions is limited to dental compensation or orthodontic- surgical treatment. This article reports the case of a patient with Class III skeletal and dental malocclusion, treated with orthodontics and bimaxillary orthognathic surgery. This treatment plan was chosen due to the impossibility of orthodontic camouflage and to improve aesthetics and function. Data were collected through a review of medical records, study models, radiographs, cone beam computed tomography, and intra and extraoral photos. The treatment achieved the desired functional and aesthetic results, with adequate intercuspidation between the dental arches, increased volume of the face's middle third region, and reduction of chin's projection.
ABSTRACT
Aim: To assess the flexural strength of orthodontic acrylic resins from two different manufacturers (VIPI, OrtoCril versus Clássico, OrtoClas) by comparing pigmented resins to colorless ones. Methods: Resins of blue, yellow and green colors were studied. A total of 120 specimens were made and then divided into groups of 15 elements each, all having the same dimensions. Next, they were kept in aqueous medium until being subjected to mechanical testing. The flexural strength was tested in a universal test machine (EMIC DL 10000) in which the specimens were subjected to a gradual load until fracture occurred. Results: Pigmented resins had flexural strength values compatible with clinical use, being similar to those from colorless ones, except for OrtoClas green-colored and yellow-colored resins, which showed greater flexural strength. The OrtoClas green-colored resin was the most resistant to fracture (482.2 N), whereas the OrtoCril colorless resin was the least resistant (368.4 N). All OrtoClas resins showed higher strength values compared to OrtoCril resins of same color, except for the OrtoCrils blue-colored resin, which presented higher flexural strength than that of the other trademark. Conclusions: The use of pigments seems to have no effect on decreasing the flexural strength of self-curing acrylic resins. Therefore, pigmented resins are compatible with clinical use.