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2019, Número 3

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Rev Odont Mex 2019; 23 (3)


Estimación de la cantidad de trióxido de bismuto como agente radiopacificador en dos cementos minerales trióxido agregado mediante una prueba de radiopacidad

Flores-Ledesma A, Gutiérrez-Estrada K, Bucio-Galindo L

Idioma: Español
Referencias bibliográficas: 70
Paginas: 139-148
Archivo PDF: 281.86 Kb.


RESUMEN

Se dice que el cemento mineral trióxido agregado (MTA) contiene 20%wt de trióxido de bismuto (Bi2O3) que le provee radiopacidad; sin embargo, la radiopacidad reportada en varias marcas de estos cementos ha sido variable, lo que sugiere que presentan diversa cantidad de bismuto, pudiendo afectar sus propiedades mecánicas. Objetivo: Estimar la concentración de trióxido de bismuto en dos marcas comerciales disponibles en México a partir de una prueba de radiopacidad. Material y métodos: cinco mezclas de cemento portland blanco (CPB) con concentraciones de Bi2O3 al 0, 10, 15, 20 y 25%wt (CPB, Bi10%, Bi15%, Bi20%, Bi25%), se analizaron dos lotes de dos cementos comerciales: MTA Angelus y MTA Viardent mediante una prueba de radiopacidad de acuerdo a la ISO 6876. Estos valores fueron determinados con base en la densidad radiográfica (tonos de grises) y convertidos a milímetros de aluminio (mm Al); se realizó un ajuste lineal con las mezclas del CPB y bismuto; se utilizó la ecuación de la recta para calcular la concentración de Bi2O3 en los cementos comerciales. Resultados: Se observó aumento de radiopacidad a mayor cantidad de trióxido de bismuto, el CPB obtuvo una radiopacidad de 1.8 mm Al, mientas que en el Bi25% fue de 6 mm Al. La concentración de 20%wt se usó como control, se observaron diferencias estadísticamente significativas en Bi15%, Bi10%, cemento Portland blanco y MTA Angelus (p ‹ 0.05). En el MTA Viardent la cantidad de bismuto es de 24-25%wt, mientras que el MTA Angelus presenta entre 20-32%wt. Conclusiones: Los cementos comerciales muestran una concentración de bismuto mayor que la sugerida, lo que aumenta la radiopacidad de éstos, pudiendo afectar las propiedades mecánicas.


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