INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Sol Gel Glass Coating on Magnesium Alloys to be Used As Temporary Implants: Electrochemical and Surface Study in Simulated Body Fluid?
Autor/es:
SCHREINER, WIDO; CERE, SILVIA; OMAR, SHEILA; CASTRO, YOLANDA; BALLARRE, JOSEFINA; DURAN, ALICIA
Lugar:
National Harbor
Reunión:
Congreso; 232nd ECS Meeting.; 2017
Institución organizadora:
The Electrochemical Society
Resumen:
Surface modification of metallic materials constitutes a strong strategy applied in the biomedical field. It opens a wide world of possibilities oriented to develop the functional properties needed for an implant acceptance when the bare material is not enough to assure good biocompatibility and tissue regeneration. Moreover, chemical surface modification developed from a potentially bioactive coating can determine the human body response. In this case, the interface between the implant and the physiological environment becomes the key factor which conditions the prosthesis success or failure. Nowadays, magnesium alloys are in the spotlight as they have the attractive feature of being biodegradable. This fact eliminates the needing of an implant removal surgery, meaning a reduction in sanitary costs and patient post-operatory suffering. However, these alloys have the drawback of hydrogen evolution during its degradation which could generate tissue inflammation and pain. Bioceramics or bioglasses are produced in a variety of forms and phases to fulfill several number of medical strategies for tissue regeneration. Bioactive glasses have the ability to react with physiological media faster than bioceramics, and to bond with living tissues forming an apatite layer. Typical bio-glasses such as Bioglass 45S55 are produced by melting. Sol- gel method is a suitable route to produce glass as coatings in a variety of compositions with the further advantage of high degree of purity and good homogeneity. The precursors of SiO2 and P2O5 in the sol gel technique are usually alkoxides, whereas inorganic salts, such as nitrates, are generally used to generate the calcium component. In fact, there are only occasional references about bioglass sol-gel materials prepared using calcium alkoxides or lactates. However, the use of calcium nitrate (which is the standard reagent employed) presents some disadvantages such as the need of removal of nitrates from the glass structure at temperatures higher than 550 ºC.