Influence of Crystalline Composition on Mechanical and Manipulation Properties in Bone Cement obtained from Wollastonite

Reference	Presenter	Authors (Institution)	Abstract
02-046	Otto Cumberbatch Morúa	Cardoso, M.J.(Universidade Federal de Campina Grande); Morúa, O.C.(Universidade Federal de Campina Grande); Farias, K.A.(Universidade Federal de Campina Grande); Sousa, W.J.(Universidade Federal de Campina Grande); Lima, R.J.(Universidade Federal de Campina Grande); carrodeguas, R.G.(Instituto de Cerámica y Vidrio); Rodriguez, M.A.(Instituto de Cerámica y Vidrio); FOOK, M.V.(Universidade Federal de Campina Grande - UFCG);	Bone cements are defined as biomaterials consisting of a solid and a liquid phase, which, when mixed together form a paste that spontaneously hardens at room or body temperature by joining two surfaces and is used as an alternative for tissue regeneration. The solid phase is based on: phosphates, sulfates, aluminates or calcium silicate, among others. Calcium silicate (wollastonite, CaSiO3) cements are formulated from a chemical reaction between a solution of phosphoric acid and wollastonite powder, where this reaction releases energy in the form of heat, resulting in a paste that spontaneously hardens at room temperature or corporeal. The composition of phases formed during the bone cement synthesis reaction is influenced by several factors, among them the concentrations of the reactants, having a great influence on the properties of the bone cements. Thus, this study aims to evaluate the influence of the crystalline composition on the mechanical properties and handling in cements obtained from wollastonite. For this, bone cements were synthesized by varying phosphoric acid concentrations and characterized by X-ray diffraction, mechanical properties of compression and manipulation, evaluating the time of mixing, work, cure and reaction temperature. The results show the presence of the brushite, wollastonite and monetite phases, the phase concentrations have changed significantly during the synthesis. According to the phases and concentrations present in the bone cement, the mechanical properties of compression, mixing time, work, cure and reaction temperature are altered. Since the presence and increase of the brushite and monetite phases concentrations causes an increase of these properties, whereas, the wollastonite phase is the inverse, that is, it reduces these properties.
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