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Evaluation of the strength and radiopacity of Portland cement with varying additions of bismuth oxide
Author(s) -
Saliba E.,
AbbassiGhadi S.,
Vowles R.,
Camilleri J.,
Hooper S.,
Camilleri J.
Publication year - 2009
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2008.01512.x
Subject(s) - portland cement , materials science , bismuth , cement , compressive strength , radiodensity , composite material , aluminium oxide , aluminium , metallurgy , medicine , surgery , radiography
Aim To study the effect of addition of various proportions of bismuth oxide on compressive strength and radiopacity of Portland cement. Methodology The compressive strength of white Portland cement and cement replaced with 10, 15, 20, 25 and 30% bismuth oxide was evaluated by testing cylinders 6 mm in diameter and 12 mm high. Twelve cylinders were tested for each material under study. The radiopacity of the cements tested was evaluated using an aluminium step‐wedge and densitometer. The optical density was compared with the relevant thickness of aluminium (Al). Statistical analysis was performed using Analysis of Variance ( anova ) with P = 0.05 and Tukey test to perform multiple comparison tests. Results Various additions of bismuth oxide had no significant effect on the strength of the material when compared with the unmodified Portland cement ( P > 0.05). The radiopacity of the cements tested ranged from 2.02 mm Al for Portland cement to 9.79 mm Al for the highest bismuth replacement. Conclusions Addition of bismuth oxide did not affect the compressive strength of Portland cement. All the bismuth oxide cement mixtures had radio‐opacities higher than 3 mm thickness of aluminium.