Purpose:To evaluate the inflammatory response of rabbit bone after insertion of titanium screws under different torque values. Methods: Four holes were made in the back tibia of fifteen New Zealand male albino rabbits; three screws were placed in each animal and a control hole remained without a screw. The screws were inserted with 0, 5 or 10 N.cm of torque. The animals were assigned to five groups according to the day of sacrifice after surgery (2, 7, 14, 21 or 42 days). The inflammatory cells and the thickness of the bone tissue around the screws was count. Results: The screws were associated with a larger number of inflammatory cells when compared to the control hole. There was no statistically significant difference when several comparisons were made among the groups with different torque intensity. Conclusions: The histological changes were not statistically significant. There was a trend toward an increase in inflammatory cells found in local bone tissue surrounding the titanium screws installed with the highest torque. There was a tendency toward the formation of a lower thickness of tissue surrounding those bone screws that were inserted with higher torque. Key words: Torque. Bone Screws. Bone Remodeling. Rabbits. RESUMOObjetivo: Avaliar em variados períodos de tempo a resposta inflamatória do tecido ósseo de coelhos nos quais foram instalados parafusos de titânio com variadas intensidades de torque. Métodos: 15 coelhos Nova Zelândia receberam três parafusos de titânio instalados em cada tíbia traseira e uma perfuração sem parafuso. Foram inseridos os parafusos com 0, 5 e 10 N.cm de torque. A eutanásia ocorreu 2, 7, 14, 21 e 42 dias pós-operatórios e foram analisados a em microscopia óptica a quantidade de células inflamatórias e espessura do tecido ósseo formado. Resultados: Observou-se que a presença de parafusos apresentou uma quantidade significantemente maior de células inflamatórias quando comparado às perfurações controle. Houve um aumento na formação de tecido ósseo adjacente aos parafusos dos grupos 14, 21 e 42 dias quando comparados aos demais. Conclusões: Quanto maiores foram os torques de instalação dos parafusos de titânio, maiores foram as quantidades de células inflamatórias locais observadas nos tecidos ósseos circundantes e que com o passar dos períodos de tempo, foram diminuindo gradativamente. As espessuras de tecidos ósseos formadas observadas ao redor dos parafusos inseridos foram proporcionalmente menores quando a intensidade dos torques aplicados foram cada vez maiores. Descritores: Torque. Parafusos Ósseos. Remodelação Óssea. Coelhos.
Median cleft of the lower lip and associated structures is a relatively rare condition. 1 We report the case of a patient with mandibular cleft. Unlike other reported cases of similar disorders, there was no cleft of the lower lip. The literature on median clefts of the lower lip and mandible is reviewed, and the etiology and treatment are discussed. Report of a case A 10-year-old girl was referred to our unit at Angelina Caron Hospital on July 27, 1999. She was the first child of healthy parents. The patients gave no history of former abnormalities in the family. The
Paciente do gênero feminino, 46 anos, edêntula total superior, apresentava aumento vertical exagerado do rebordo alveolar maxilar, confirmado clinicamente, radiograficamente e através de modelos de estudo montados em articulador semi-ajustável. Desta forma impossibilitava a confecção da prótese total superior, pois ao ocluir, a paciente contactava o rebordo maxilar nos dentes inferiores, existindo inclusive uma certa reabsorção óssea localizada nesses contatos. Realizou-se a regularização do rebordo através de gengivectomia interna associada a osteotomia e osteoplastia, obtendo-se espaço suficiente para a reabilitação protética dentro dos princípios estético, fonético e mastigatório, fundamentais para o bom funcionamento do aparelho estomatognático.
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