Avaliação de propriedades físico-químicas do silicato tricálcico com adição de diferentes radiopacificadores

Abstract

The tricalcium silicate is the main component of hydraulic cements used in dental therapy. The aim of this study was to evaluate the physicochemical properties of tricalcium silicate with radiopacifiers agents. Therefore, was used the tricalcium silicate cement with 20% bismuth oxide, zirconium oxide, bismuth subcarbonate and barium sulfate, besides of Portland cement with 20% bismuth oxide and Biodentine™. Characterization tests were performed for powders and the surface of the hydrated cements bioactivity in vitro, microhardness, radiopacity, compressive strength, solubility and initial set time. The results showed that all tested cements exhibit bioactivity after 7 days. The zirconium oxide significantly increased microhardness of the tricalcium silicate. Among the used radiopacifiers, those containing bismuth in composition were more efficient in increase in radiopacity values of the tested cements, while the Biodentine ™ showed lower radiopacity to 3 mmAl. Tricalcium silicate cement with barium sulphate showed compressive strength values greater than cements containing bismuth oxide as radiopacifier. The Biodentine™ had the highest solubility among the tested cements, but below the maximum of 3%, as recommended by the specification No 57 ANSI/ADA. The Biodentine ™ was the cement with the shortest setting time. All radiopacifiers agents tested, the zirconium oxide provided the physicochemical properties more desirable for clinical use, increasing the microhardness, radiopacity, compressive strength and reducing solubility.