resumo
A bioactive glass of the 3CaO center dot P(2)O(5)-MgO-SiO(2) System was incorporated as a filler into poly(methylmethacrylate)-co-(ethylhexylacrylate) (PMMA-co-EHA) copolymer. The effect of filler proportion (0, 30, 40 and 50 wt.%) on the bending properties was evaluated and a maximum flexural strength of 29 MPa coupled with an elastic modulus of 1.1 GPa was obtained at an intermediate filler concentration (30 wt.%). These values are slightly higher than those usually reported for human cancellous bone. The in vitro bioactivity was assessed by determining the changes in surface morphology and composition after soaking in simulated body fluid (SBF, Kokubo solution). Inductively coupled plasma was used to trace the evolution of ionic concentrations in the SBF solution, namely Ca and P. X-ray diffraction and scanning electron microscopy confirmed the growth of spherical calcium phosphate aggregates on the surface of composites, indicating that the composites are potentially bioactive. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
palavras-chave
ACRYLIC BONE-CEMENT; IN-VITRO BIOACTIVITY; FUNCTIONALIZED METHACRYLATES; HYDROXYAPATITE; PARTICLES; APATITE; HA
categoria
Engineering; Materials Science
autores
Lopes, P; Corbellini, M; Ferreira, BL; Almeida, N; Fredel, M; Fernandes, MH; Correia, R
nossos autores
Bárbara Joana Martins Leite Ferreira
Investigador Júnior
Maria Helena Figueira Vaz Fernandes
Professor(a) Jubilado(a)agradecimentos
B.L.F. and P.L. thank the Portuguese Foundation for Science and Technology (FCT) for their doctoral research Grant (SFRH/BD/17389/2004) and (SFRH/BD/27961/ 2006), respectively. This work was supported by University of Aveiro-Research Institute (Project CTS 05). The authors also thank Concelgdo Costa (X-ray Diffraction), Marta Ferro (Electron Microscopy) and Fldvia Almeida (Mechanical Properties) for valuable technical and professional assistance.