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Abstract(s)
Ao longo do processo de furação, muitas vezes utilizado na fixação de implantes, é gerado um aumento de temperatura. Se essa temperatura for muito elevada pode ocorrer a necrose do tecido ósseo com a consequente diminuição da eficiência do sistema de fixação. No presente estudo foram utilizados dois materiais distintos (espumas rígidas de poliuretano e ossos de fémur de bovino ex-vivo) com o objetivo de estudar o efeito dos parâmetros de furação ao longo do processo. Os parâmetros definidos para a realização dos ensaios foram baseados no método de Taguchi, para encontrar a combinação ótima desses parâmetros. Foram realizados três casos práticos diferentes, onde foram utilizadas matrizes ortogonais no planeamento de experiências a partir das quais foi analisada a relação sinal-ruído, a variância (ANOVA) e a proporção de Pareto, de forma a obter o efeito e a interação de cada parâmetro no processo de furação. Nos estudos realizados foi encontrada a combinação ótima dos parâmetros de furação e confirmada através de um ensaio laboratorial de verificação.
During the drilling process often used for implant fixation, it is generated an increasing temperature. If this temperature is too high, necrosis of the bone tissue may occur, with consequent decrease of efficiency in the fixation system. In the present study, two different materials (rigid polyurethane foams and ex-vivo bovine bone femurs) were used to study the effect of drilling parameters during the process. The parameters defined for the tests were based on the Taguchi method, to find the optimal combination of these parameters. Three different practical cases were used, where orthogonal matrices were applied from which the signal-to-noise ratio, the variance (ANOVA) and the Pareto’s ratio were analysed in order to obtain the effect and the interaction between parameter in the drilling process. In these three cases, the optimal combination of the drilling parameters was found and confirmed through a new laboratory test.
During the drilling process often used for implant fixation, it is generated an increasing temperature. If this temperature is too high, necrosis of the bone tissue may occur, with consequent decrease of efficiency in the fixation system. In the present study, two different materials (rigid polyurethane foams and ex-vivo bovine bone femurs) were used to study the effect of drilling parameters during the process. The parameters defined for the tests were based on the Taguchi method, to find the optimal combination of these parameters. Three different practical cases were used, where orthogonal matrices were applied from which the signal-to-noise ratio, the variance (ANOVA) and the Pareto’s ratio were analysed in order to obtain the effect and the interaction between parameter in the drilling process. In these three cases, the optimal combination of the drilling parameters was found and confirmed through a new laboratory test.
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Keywords
Taguchi Furação Temperatura Osso