Abstract:
Objective To compare the chemical composition and physical properties of Thai White Portland Cement 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 size of two Thai White Portland cements adding bismuth oxide and White ProRoot® MTA. Scanning electron microscope (SEM) was used to analyze morphological characteristic. Then pH meter with temperature compensated electrode was used to measure pH value every 1 minute for 1 hour. Radiopacity of the samples compared to aluminium step wedge under ISO 6876(2001). Setting times were determined under American Society of Testing and Materials recommended by ISO 6876(2001). Compressive strength and solubility determined under ISO 9917-1(2003) and ADA specification no. 30, respectively. Descriptive statistical analysis , One way ANOVA, Two way ANOVA and t-test were used to analyze the experimental datas. Result Chemical composition, particle size and morphological characteristic of two Thai White Portland cements, KILAN and WHITE ELEPHANT brand, adding bismuth oxide were similar to White ProRoot®MTA. Radiopacity of two Thai brands adding bismuth oxide was significantly more than White ProRoot®MTA (p < 0.05). White ProRoot®MTA, WHITE ELEPHANT and KILAN brand adding bismuth oxide showed pH 12.5, 12.5 and 12.6 at 23, 24 and 16 minutes, respectively. WHITE ELEPHANT brand 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 statistic different between all samples at 1, 7 and 21 days. (p > 0.05) Conclusion Two Thai White Portland cements adding bismuth oxide and White ProRoot®MTA were similar in chemical composition and physical properties.