Effect of bioglass additions on the sintering of Y-TZP bioceramics
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/10/2012
18/10/2012
2009
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Resumo |
The objective of this work was to evaluate the influence of bioglass additions on the sintering and mechanical properties of yttria-stabilized zirconia ceramics, Y-TZP Samples containing different bioglass additions, varying between 0 and 30 wt.%, were cold uniaxial pressed at 80 MPa and sintered in air at 1200 degrees C or 1300 degrees C for 120 min. Sintered samples were characterized by X-ray Diffractometry and Scanning Electron Microscopy. Hardness and fracture toughness were determined using Vickers indentation method. As a preliminary biological evaluation, in vitro cytotoxicity tests by Neutral Red Uptake method (using mouse connective tissue cells, NCTC clone L929 from ATCC bank) were realized to determine the cytotoxicity level of ZrO(2)-bioglass ceramics. The increasing of bioglass amount leads to the decreasing of relative density due to martensitic (tetragonal-monoclinic) transformation during cooling of the sintered samples. Y-TZP samples sintered at 1300 degrees C containing 5 wt.% of bioglass presented the best results. with high relative density, hardness and fracture toughness of 11.3 GPa and 6.1 MPa m(1/2), respectively. Furthermore, the un-cytotoxic behavior was observed in all sintering conditions and bioglass amounts used in this study. (C) 2009 Elsevier B.V. All rights reserved. FAPESP[04/04386-1] FAPESP[06/50510-1] |
Identificador |
Materials science and engineering. C, Biomimetic materials, sensors and systems, v.29, n.6, p.1959-1964, 2009 0928-4931 http://producao.usp.br/handle/BDPI/17601 10.1016/j.msec.2009.03.006 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV |
Relação |
Materials science and engineering. C, Biomimetic materials, sensors and systems |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #Bioceramics #Sintering #ZrO(2) #Bioglass #Characterization #MECHANICAL-PROPERTIES #RESIDUAL-STRESS #MODEL ANALYSIS #CERAMICS #ZIRCONIA #TOUGHNESS #BIOCOMPATIBILITY #COMPOSITES #STABILITY #STRENGTH #Materials Science, Biomaterials |
Tipo |
article original article publishedVersion |