251 resultados para Pinos de retenção dentária
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Pós-graduação em Agronomia (Energia na Agricultura) - FCA
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Pós-graduação em Biopatologia Bucal - ICT
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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The mobility of water in the soil is a difficult process to be quantified. During precipitation, there is a portion of the water that infiltrates, which is very important for recovering the groundwater balance. This work studies the mobility of water in sandy soils with different textures and residual soils through experiments mounted in lysimeters. The lysimeters were mounted on acrylic cylinder with 11.3 cm diameter and 25.0 cm in length. The sand was deposited using the process sand rain. In the tests it was maintained a hydraulic head of two centimeters above the surface with the aid of a Mariotte flask. The portions of water were controlled in the experiments using relations between weight and volume measurements over time. The data were obtained by monitoring the input and output volumes of water through calibrated reservoir and system weight by an electronic balance. The infiltration front was monitored with the aid of a digital camera. The results indicate that the smaller the particle size of the sand, the lower the speed of the saturation front, the higher the retained volume, the smaller the basic rate of infiltration and the lowest speed of percolation. Moreover, the rate of water loss in the evaporation process indicated no significant difference with variation of the particle size of the samples
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A pesquisa de novas substâncias com atividade anti-Candida é importante devido à ocorrência de resistência por parte de algumas destas espécies aos antifúngicos usuais. Araújo e colaboradores (2009) comprovaram a atividade antifúngica do extrato de Syngonanthus nitens e torna-se relevante a proposta de formulações e o estudo destas. O objetivo geral deste trabalho foi a avaliação da liberação, permeação e retenção na mucosa vaginal in vitro de formulação (creme) contendo o extrato de Syngonanthus nitens, em comparação com outra formulação proposta (gel), para averiguar qual das formulações apresenta mais vantagens para o tratamento da candidíase. Foi validado um método analítico para quantificação do extrato de S. nitens por espectrofotômetro UV-VIS utilizando o padrão luteolina. Os parâmetros analíticos utilizados para avaliar a credibilidade do método analítico foram: seletividade e especificidade, linearidade, limite de quantificação, precisão, exatidão e robustez. O método analítico proposto mostrou-se satisfatório: apresentou seletividade e especificidade; linearidade (os pontos obtidos nas concentrações de 5 a 30 µg/mL apresentaram-se lineares e com um ótimo coeficiente de correlação linear: 0,99996); precisão e exatidão; robustez; e o limite de quantificação foi de 0,5 µg/mL, com coeficiente de variação menor que 5%. Além disso, foram realizados testes de estabilidade preliminar e estudos reológicos, e a formulação creme apresentou resultados adequados para o uso proposto e também apresentou estabilidade. Os ensaios de liberação demonstraram que ambas as formulações apresentam cinética de liberação conforme o modelo de Higuchi, ou seja, a velocidade de liberação do fármaco da matriz do sistema se dá por difusão controlada. Os resultados mostram que as duas formulações apresentam perfil de liberação muito... (Resumo completo, clicar acesso eletrônico abaixo)
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The objective of this in vitro study was quantify the micro strain development around the internal hexagon implants, varying the type of prosthetic coping. For This reason, three implants of internal hexagon were inserted into one polyurethane block in line placement. Microunit abutments were screwed onto the implants. Tangentially the implants were bonded the strain gauges, two to the center implant. Ten structures, each one containing three copings were cast in Co-Cr alloy, that were divided into groups in the first group, plastic copings were used, and in the second group machined copings were used. The superstructure’s occlusal screws were tightened onto Microunit abutments with 10 Ncm torque, the magnitude of micro strain was recorded. The mean values of each strain gauge of each plastic copings were 363,37 ± 237,66 and the machined copings were 338,12 ± 223,01. The data were analyzed statistically by t- Student test. No statistically significant difference was found between the prosthetic copings (p= 0,867). It was concluded that to internal hexagon implants in line placement, the type of copings presented similar magnitude of micro strain after prosthetic occlusal screw was tightened
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Pós-graduação em Odontologia Restauradora - ICT
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Pós-graduação em Ciência Odontólogica - FOA
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Permanent teeth impaction is highly prevalent among brazilian people. Its etiology is related to local and general factors association. Permanent teeth retention compromises dental occlusion and when anterior teeth are involved, it also brings esthetics impairments which lead to psychological disturbance. Early diagnosis and adequate treatment are extremely important to solve not only occlusal problems but also psychological aspects. Orthodontic traction of impacted teeth can be conducted by using fixed or removable appliances. Although it depends on patient compliance the use of removable appliances provides an anchorage based on the teeth and the palate reducing undesirable side effects. This paper describes the case of a fourteen years old female patient whose right maxillary central incisor was adequately tractioned with a removable orthodontic appliance. Removable orthodontic devices were used at first to reposition teeth in maxillary anterior area what provided adequate space to allow the placement of the impacted incisor and after were also used to traction and position this tooth. The procedure described seemed to be effective, non expensive and a viable treatment to be performed even on the scope of public health services, extending orthodontic treatment to a higher number of patients.