Publicação: Characterization of a polymer-infiltrated ceramic-network material
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2014-05-01
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Elsevier B.V.
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Objectives: To characterize the microstructure and determine some mechanical properties of a polymer-infiltrated ceramic-network (PICN) material (Vita Enamic, Vita Zahnfabrik) available for CAD-CAM systems.Methods. Specimens were fabricated to perform quantitative and qualitative analyses of the material's microstructure and to determine the fracture toughness (K-Ic), density (rho), Poisson's ratio (nu) and Young's modulus (E). K-Ic was determined using V-notched specimens and the short beam toughness method, where bar-shaped specimens were notched and 3-point loaded to fracture. rho was calculated using Archimedes principle, and nu and E were measured using an ultrasonic thickness gauge with a combination of a pulse generator and an oscilloscope.Results. Microstructural analyses showed a ceramic- and a polymer-based interpenetrating network. Mean and standard deviation values for the properties evaluated were: K-Ic = 1.09 +/- 0.05 MPa m(1/2), rho = 2.09 +/- 0.01 g/cm(3), nu = 0.23 +/- 0.002 and E = 37.95 +/- 0.34 GPa.Significance. The PICN material showed mechanical properties between porcelains and resin-based composites, reflecting its microstructural components. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
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Dental Materials. Oxford: Elsevier Sci Ltd, v. 30, n. 5, p. 564-569, 2014.
