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This study used optical coherence tomography (OCT) compared to scanning electron microscopy (SEM) and optical microscopy (OM) to evaluate qualitatively crack propagation and final fracture in restorative composite materials -Filtek Z250 and Filtek Z350 (3M ESPE) -with fiber reinforcement after cyclic loading. Samples were made using a split mold. Initially, 3-point bending tests were performed to determine the maximum force and tension at the fracture moment using samples without fiberdoi:10.1590/s0103-64402010000500008 pmid:21180798 fatcat:voz2n3weznaxxaecfh4xpfnnha