Estevam Barbosa de Las Casas

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Oral forces applied to human teeth during biting and mastication are normally described in the literature only in terms of their axial components. The purpose of this study was to fully determine the spatial characteristics of the oral resultant force - its normal and tangential components - for a given individual. A load cell was especially manufactured to(More)
A geometrically nonlinear formulation for composites and the derived explicit dynamic finite element program are presented. The relevant variables at each time step are mapped into an equivalent isotropic space, where the integration of the rate constitutive equations is performed. The evolution of the internal variables is calculated in the mapped spaces,(More)
Purpose To verify whether there are differences of tongue force on the teeth at rest and during swallowing between individuals who report appropriate tongue position and those who report tongue thrust. Methods Tongue forces on the teeth were evaluated in 28 participants aged 19 to 31 years. To this end, a Flexiforce® resistive sensor was fixed to the(More)
PURPOSE To verify the association of tongue clinical evaluation aspects with quantitative evaluation of tongue force. METHODS A cross-sectional study was conducted with 48 healthy adults, 13 men and 35 women (ages 20-44 years; mean - M=24.8 years; standard deviation - SD=5.3 years). By clinical evaluation, the following aspects were checked: tongue force,(More)
Thermo-mechanical finite element analyses in 3-D models are described for determination of the stress levels due to thermal and mechanical loads in a healthy and restored tooth. Transient thermo-mechanical analysis simulating the ingestion of cold and hot drinks was performed to determine the temperature distribution in the models of the teeth, followed by(More)
PURPOSE The purpose of this study is to validate a model for the analysis of the load distribution through the wrist joint, subjected to forces on the axes of the metacarpals from distal to proximal for two different mesh densities. METHOD To this end, the Rigid Body Spring Model (RBSM) method was used on a three-dimensional model of the wrist joint,(More)
The aim of this study was to compare the areas of stress concentration in a three-dimensional (3D) premolar tooth model with anisotropic or isotropic enamel using the finite element method. A computed tomography was imported to an image processing program to create the tooth model which was exported to a 3D modeling program. The mechanical properties and(More)
Teachers are professionals with high prevalence of dysphonia, whose main risk factors are the large work hours in classrooms with the presence of background noise. The purpose of the study was to calculate the phonation time and the cycle dose of teachers with dysphonia and teachers without voice disorders during the class. There were two groups analyzed:(More)
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