Informador Técnico
ISSN: 2256-5035 (Electrónico)
ISSN: 0122-056X (Impreso)
Formato: Electrónico / Acceso Abierto
Frecuencia: Números Semestrales
Revisión por Pares: Doble Ciego
La hidroxiapatita se ha usado como recubrimientos en vástagos de prótesis de cadera por muchos años. Sin embargo, se ha observado que estos recubrimientos se desprenden llevando a la pérdida de la prótesis, debido a que sus propiedades mecánicas no cumplen los requerimientos de la aplicación. Ya que el titanato de calcio se ha propuesto como recubrimiento para aplicaciones biomédicas, por la biocompatibilidad y osteoconductividad mostrada en ensayos in vitro, en este trabajo se midió el efecto de agregar titanato de calcio a recubrimientos de fosfatos de calcio, obtenidos mediantes magnetrón sputtering, en su adherencia y módulo elástico, los cuales se evaluaron mediante ensayo de rayado según norma ASTM C1624-05 y nanoindentación, de acuerdo a la norma ASTM E2546-07, respectivamente. La biocompatibilidad in vitro de los recubrimientos se evaluó mediante ensayos de genotoxicidad y hemólisis, según norma ASTM F748-06. El recubrimiento de 100% fosfato de calcio (CP) estuvo compuesto de una mezcla de fosfato tricálico y tetracálcico, al cual se le adicionó titanato de calcio (TC), mediante modificación de un blanco de Ca10(PO4)6(OH)2-2xOx□x, en porcentajes de 25, 50 y 75 en volumen. Para efectos comparativos, también se obtuvieron recubrimientos de 100% TC. Se encontró que la adherencia se incrementó al adicionar 25% de un material en el otro, y que fue máxima en el recubrimientos 50%-50%. Además, se encontró que los recubrimientos son no genotóxicos y , a lo sumo, levemente hemolíticos.
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