Roger Correa de Barros Berthold

Submandibular myofibroma: a case report

PurposeMyofibroma is a rare benign spindle cell neoplasm, and the aim of the present study was to carry out a literature review and present a clinical case of a patient with a myofibroma in the submandibular region and its management.ConclusionsDiagnosis of myofibroma can be reached by a histopathologic and immunohistochemical analysis and surgical excision is the treatment of choice.

Treatment of Class II division 1 malocclusion in a patient with traumatized central incisors: a case report

OBJETIVO: O objetivo deste trabalho e relatar o caso clinico de uma paciente portadora de maloclusao Classe II divisao 1 com incisivos centrais superiores traumatizados com reabsorcao interna e externa e a opcao de tratamento de extrai-los, seguido de fechamento do espaco com a mesializacao dos incisivos laterais superiores. DESCRICAO DO CASO: Paciente do sexo feminino com 10 anos de idade relatou trauma facial, apos queda de bicicleta, e avulsao e reimplante dos incisivos centrais superiores aos 9 anos de idade. Optou-se pela extracao dos incisivos centrais superiores mesializando os incisivos laterais para a posicao dos centrais, restaurando-os para ficar esteticamente aceitavel. CONCLUSAO: A extracao dos incisivos centrais superiores nao e um protocolo de tratamento comum. Porem, para pacientes portadores de maloclusao Classe II divisao 1 com incisivos centrais traumatizados e com reabsorcao radicular externa e interna pode ser uma boa solucao para a correcao do sobrepasse aumentado.

Influence of plasma arc and quartz-tungsten-halogen curing lights on the polymerization of orthodontic composite resin

Purpose: To analyze, in vitro, the influence of a quartz-tungsten-halogen (QTH) and a plasma arc (PAC) on the degree of conversion and hardness of a composite resin, as well as the heat generated by the units. Methods: Transbond XT disks were prepared and light-cured for 10, 20 and 30 seconds with a QTH (Curing Light XL 3000) or with a PAC (Apollo 95E) for 1, 2 and 3 seconds. The composite resin polymerization was evaluated by infrared spectrophotometry (FTIR) and Knoop hardness number (KHN). The temperature at the curing tip was evaluated. The results were analyzed using ANOVA and Tukey test (α=0.05). Results: According to FTIR and KHN, the polymerization of the composite resin was statistically higher with the QTH. The temperature obtained with the QTH 20 s (45.44oC) and 30 s (45.84oC) was statistically higher than the QTH 10 s (39.90oC). The PAC 1 s (27.12oC), 2 s (28.48oC) and 3 s (29.96oC) presented the lowest temperature and did not differ statistically among them. Conclusion: Transbond XT light-activated for 10, 20 and 30 seconds with the QTH presented higher degree of conversion and hardness in comparison with those obtained with the PAC for 1, 2 and 3 seconds, and the QTH generated more heat than the PAC.