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Artigo Científico | Geral Propriedades Mecânicas | Inglês | 10/08/2008
Autores: Carla Castiglia Gonzaga, Catia Fredericci, Cristina Yuri Okada, Flávio Beneduce Neto, Humberto Naoyuki Yoshimura, Paulo Francisco Cesar
Palavras-chave: dental glass-ceramics, injection temperature, mechanical properties, porosity
Resumo: The objective of this work was to evaluate biaxial-flexural-strength (σf), Vickers hardness (HV), fracture toughness (KIc), Young's modulus (E), Poisson's ratio (ν) and porosity (P) of two commercial glass-ceramics, Empress (E1) and Empress 2 (E2), as a function of the hot-pressing temperature. Ten disks were hot-pressed at 1065, 1070, 1075 and 1080 °C for E1; and at 910, 915, 920 and 925 °C for E2. The porosity was measured by an image analyzer software and sf was determined using the piston-on-three-balls method. KIc and HV were determined by an indentation method. Elastic constants were determined by the pulse-echo method. For E1 samples treated at different temperatures, there were no statistical differences among the values of all evaluated properties. For E2 samples treated at different temperatures, there were no statistical differences among the values of σf, E, and ν, however HV and KIc were significantly higher for 910 and 915 °C, respectively. Regarding P, the mean value obtained for E2 for 925 °C was significantly higher compared to other temperatures.
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