Comparison of chemical composition and
physical properties of two Thai White
Portland cements with bismuth oxide
versus White ProRoot® MTA
Authors :
- Sirikwan Sirichaivongsakul D.D.S.
- Anchana Panichuttra D.D.S., M.S, Ph.D.
Abstract :
Objective To compare the chemical composition and physical properties of two Thai White Portland
cements adding bismuth oxide and White ProRoot® MTA.
Materials and methods X-ray analytical microscope probe and particle size analyzer were used to
determine chemical composition and particle sizes of two Thai White Portland cements adding bismuth
oxide and White ProRoot® MTA. Scanning electron microscopy was used to analyze morphological
characteristics. Then pH meter with temperature compensated electrode was used to measure pH value
every 1 minute for 1 hour. Radiopacity of the sample was compared with aluminium stepwedge under
ISO 6876(2001). Setting times were determined under the protocol of the American Society of Testing
and Materials recommended by ISO 6876(2001). Compressive strength and solubility were determined
under ISO 9917-1(2003) and ADA specification no. 30, respectively. Descriptive statistical analyses,
One-way ANOVA, Two-way ANOVA and t-test were used to analyze the experimental data.
Results Chemical composition, particle sizes and morphological characteristics of two Thai White
Portland cements adding bismuth oxide were similar to those of White ProRoot® MTA. Radiopacity of
two Thai brands adding bismuth oxide was significantly more than White ProRoot® MTA (p < .05).
White ProRoot® MTA, Thai White Portland cement brand I and brand II adding bismuth oxide showed
pH 12.5, 12.5 and 12.6 at 23, 24 and 16 minutes, respectively. Thai White Portland cement brand I
adding bismuth oxide exhibited the lowest initial and final setting times and also showed the highest
compressive strength after 1 day (37.027 MPa). However, White ProRoot® MTA displayed the highest
compressive strength after 21 days (449.686 MPa). The result of solubility test revealed no statistical
difference among all samples at 1, 7 and 21 days (p > .05).
Conclusion Two Thai White Portland cements adding bismuth oxide and White ProRoot® MTA were
similar in chemical composition and physical properties.
(CU Dent J. 2008;31:145-58)
Keywords :
bismuth oxide; chemical compositions; physical properties; Thai White Portland cement;
White ProRoot® MTA
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