A portion of calcium silicate cement (CSC; Irajazinho Votorantim, Cimento Rio Branco, Rio de Janeiro, Brazil) was mixed with 0%, 15%, 20%, 30% and 50% of bismuth oxide (BO; Merck, New Jersey, USA), proportioned in weight using an electronic analytic scale (Mettler Toledo PG5002-S, Sao Paulo, Brazil).
Controversially, the increase of BO decreased the [DELTA]E of the calcium silicate cement. The CSC group presented statistically higher [DELTA]E values than the CSC / 50% BO (p < 0.05).
The radiopacifier bismuth oxide is yellow in color; however, contrary to what would be expected, the addition of a high proportion of bismuth oxide to calcium silicate cement did not result in an increase in yellowness ([DELTA]b).
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