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Revista odontológica mexicana
versión impresa ISSN 1870-199X
Resumen
FLORES-LEDESMA, Abigailt; GUTIERREZ-ESTRADA, Kenya y BUCIO-GALINDO, Lauro. Estimation of the amount of bismuth trioxide as radiopacifying agent by a radiopacity test in two mineral trioxide aggregate cements. Rev. Odont. Mex [online]. 2019, vol.23, n.3, pp.139-148. Epub 31-Mar-2025. ISSN 1870-199X. https://doi.org/10.22201/fo.1870199xp.2019.23.3.75622.
The mineral trioxide aggregate (MTA) cement contains approximately 20%wt of bismuth trioxide (Bi2O3), a radiopacifying material. However, the radiopacity reported in several commercial brands of these cements is variable because they have different amounts of bismuth, which affects its mechanical properties.
Objective:
To estimate by a radiopacity test the concentration of Bi2O3 in two brands of MTA cements available in Mexico.
Materials and methods:
Five mixtures of white Portland cement (WPC) with Bi2O3 concentrations of 0%, 10%, 15%, 20%, and 25%wt (WPC, Bi10%, Bi15%, Bi20%, Bi25%) and four lots of two commercial cements (two lots each), MTA Angelus and MTA Viardent, were analyzed by a radiopacity test according to the international Standard ISO 6876. These values were determined on the basis of radiographic density (shades of grey) and converted to millimeters of aluminum (mm Al). A linear adjustment was made with the mixtures of WPC and bismuth; the straight line equation was used to calculate the concentration of Bi2O3 in commercial cements.
Results:
Radiopacity increased with higher amounts of Bi2O3; the WPC obtained a radiopacity of 1.8 mm Al, while for Bi25% radiopacity was 6 mm Al. The 20%wt concentration was used as control; a statistically significant difference was observed in Bi15%, Bi10%, WPC, and MTA Angelus (p<0.05). In the MTA Viardent the amount of bismuth is 24-25%wt, while in the MTA Angelus is between 20-32%wt.
Conclusions:
Commercial cements have a higher bismuth concentration than recommended, which increases their radiopacity and may compromise their mechanical properties.
Palabras llave : Trioxide aggregate cement; radiopacity; bismuth trioxide; calcium silicate-based cements.
