This work presents the development of a system for the measurement of the axial forces produced by the human tongue. A prototype was developed which reproduces the underlying principles of the methods normally adopted in clinical procedures, with the advantage that it allows the phonoaudiologist to obtain objective measurements of these forces. This work also presents an analysis based on the repeatability and the reproducibility of the forces in an attempt to select which of these forces can be employed as parameters for diagnosis and as success indicators of therapies. Preliminary results indicate the mean force as the most reliable parameter.KEYWORDS: Instrumentation, Biometrics, Force measurement, Reproducibility, Repeatability. RESUMOO presente trabalho apresenta o desenvolvimento de um sistema para medição da força axial da língua humana. Como diferencial, o protótipo desenvolvido apresenta concordância metodológica com a prática clínica fonoaudiológica, no que diz respeito ao teste aplicado para a percepção da tensão lingual. O trabalho também verifica quais os pontos notáveis de força devem ser utilizados como parâmetros para a análise clínica, justificados a partir de testes de reprodutibilidade e repetitividade, numa tentativa de selecionar quais desses pontos podem ser empregados como parâmetros para o diagnóstico e como indicadores do sucesso de terapias. Resultados preliminares apontam para o uso da força média como medida mais confiável para a clínica fonaudiológica.
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