resumo
Calcium phosphate cements have been in clinical use for the last 10 years. Their most salient features include good biocompatibility, excellent bioactivity, self-setting characteristics, low setting temperature, adequate stiffness, and easy shaping to accomodate any complicated geometry. They are commonly used in filling bone defects and trauma surgeries as mouldable paste-like bone substitute materials. Substitution of trace elements, such as Mg, Sr and Zn ions, into the structure of calcium phosphates is the subject of widespread investigation nowadays, because of their impending role in the biological process. Subtle differences in composition and structure of these materials may have a profound effect on their in vivo behaviour. Therefore, the main goal of this paper is to provide a simple, but comprehensive overview of the present achievements relating to brushite-forming cements doped with Mg, Zn and Sr, and to identify new developments and trends. In particular, the influence of ionic substitution on the chemical, physical and biological properties of these materials is discussed.
palavras-chave
BETA-TRICALCIUM PHOSPHATE; CALCIUM-PHOSPHATE; IN-VIVO; BIPHASIC HYDROXYAPATITE; STRUCTURE REFINEMENT; RIETVELD REFINEMENT; STRONTIUM; MAGNESIUM; ZINC; CERAMICS
categoria
Materials Science
autores
Pina, S; Ferreira, JMF
nossos autores
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)
Sandra Cristina de Almeida Pina
Bolseiro de pós-Doutoramentoagradecimentos
Thanks are due to CICECO for the support and to the Portuguese Foundation for Science and Technology for the fellowship grant of S. Pina (SFRH/BD/21761/2005).