Estudo de propagaÃÃo de fratura em compÃsitos odontolÃgicos utilizando tomografia por coerÃncia Ãptica / Crack propagation study in dental composites by optical coherence tomography

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Contemporary approaches to fatigue principles consider a fracture process in three phases: crack initiation, slow crack growth, and fast fracture. The purpose of this study was to analyze the sites of fracture initiation and slow crack propagation in a fiber reinforced composite, using images produced by the optical coherence tomography. The traditional microscopy investigation, most commonly used to study this material, is a destructive technique, which requires specimen sectioning and are essentially surface measurements. On the basis of these considerations, in this research we analyzed the interior of a dental sample reinforced with fiber after a mechanical and thermal cycling to emulate oral conditions using optical coherence tomography (OCT). The device we are using is a home built Fourier domain OCT working at 800 nm with 6 μm special-axial resolution. In long term, fractures allow bacterial invasion provoking plaque and calculus formation that can cause caries and periodontal disease. Therefore, non invasive imaging of the bridge fiber enables the possibility of periodic clinical evaluation to ensure the patient health. Furthermore, OCT images can provide a powerful method for quantitative analysis of crack propagation, and can potentially be used for in vivo

ASSUNTO(S)

tomografia por coerÃncia Ãptica propagaÃÃo de fratura resina optical coherence tomography resin crack propagation odontologia

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