Abstract

MENDOZA, EMIGDIO JOSÉ; ZAMORA, LEONARDO ALFONSO  and  VARGAS GALVIS, FABIO. INFLUENCE OF MAGNESIUM OXIDE CONTENT AND HEAT TREATMENT IN DISSOLUTION OF Ca⁺² OF A CERAMIC MATERIAL BIOACTIVE TYPE 31SiO₂-11P₂O₅-(58-x)CaO-xMgO. Dyna rev.fac.nac.minas [online]. 2006, vol.73, n.150, pp.167-173. ISSN 0012-7353.

Bioactive materials produce a cohesive bound with life tissue because a layer surface formation of hidroxiapatite (HA). The interchange between calcium (Ca²⁺) phosphate (PO₄)^3- of materials ions and the surrounding fluids produce the HA surface layer. This paper establish the influence of de magnesium oxide on the crystallization by heat treatment of the material. Also the relation ship between the phases type with the calcium ions (Ca²⁺) interchange when the vitroceramic material is in simulated physiological fluid, is analyzed. This study was started by the obtention of vitroceramics samples with different magnesium oxide percentages. After heat treatment temperature which the material get on vitroceramic, was fixed. Finally, the samples were immersed in a Ringer solution for Ca²⁺ dissolution by invitro test. The cristalinity level of the samples was caracterized by X ray diffraction (DRX) and reflected light optical microscopy. The Ca²⁺ disolution in the Ringer solution was measured by atomic absortion. The results should that the amount of the calcium oxide in the vitroceramic is not deterministic in the calcium interchange ions. In spite of way which the Ca²⁺ ions is in the biomaterial structure.

Keywords : Bioactive ceramics; Heat treatment; Ion interchange.

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