Synthesis and characterization of biphasic calcium phosphates for biomedical applications

Reference Presenter Authors
(Institution)
Abstract
02-011 Hudson de Araújo Batista Batista, H.d.(Universidade Federal de Campina Grande); Santos, P.T.(Universidade Federal de Campina Grande); Araujo, R.M.(UFCG); Oliveira, H.M.(Universidade Federal de Campina Grande - UFCG); Leite, R.B.(Universidade Federal de Campina Grande); Costa, A.C.(Universidade Federal de Campina Grande); Araújo, P.M.(Universidade Federal de Campina Grande);

By definition, biphasic calcium phosphate consists of two phases of individual CaP, commonly of a more stable phase (Hydroxyapatite - HAp) and a more soluble phase (tricalcium phosphate - ? - TCP) in different proportions. This combination of crystalline phases presents significant advantages over other types of CaP bioceramics, allowing better control over bioactivity and biodegradation, which guarantees the stability of the biomaterial. In addition, the higher release of Ca2 + ions when compared to pure HAp is proposed as one of the parameters that explain the greater osteoinductive potential of this group of materials. From the above, the purpose of this work was the synthesis and characterization of biphasic calcium phosphates. For this, the synthesis by combustion of the solution containing the precursor ions was used, using the glycine as fuel applying three different temperatures (500, 650 and 800°C) for thirty minutes. The material was characterized by X-ray diffraction, refinement by the Rietveld method and scanning electron microscopy. The coexistence of the crystalline phases, i.e., the HA/?-TCP compound was confirmed in all samples and exhibited a percentage composition of the phases of approximately 50% / 50% (m / m). The microstructure showed agglomerated particles with equiaxial habit, which are characteristic of the aforementioned type of synthesis.

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