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Effect of different mixing and placement methods on the compressive strength of calcium-enriched mixture
Safoora Sahebi1, Nooshin Sadatshojaee1, Zahra Jafari1
1Department of Endodontics, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran.
Introduction:
The aim of this experimental laboratory study was to evaluate the effect of different mixing and placement techniques on compressive strength (CS) of calcium-enriched mixture (CEM) cement.
Methods And Materials:
CEM powder was mixed with its liquid either by hand mixing or amalgamator mixing. The mixture was loaded to cylindrical acrylic molds with 6.0±0.1 mm height and 4.0±1 mm diameter. Half of the specimens in each group were selected randomly and ultrasonic energy was applied to them for 30 sec. All samples were incubated for 7 days at 37(°)C. The CS test was performed by means of a universal testing machine. The data were analyzed by the two-way analysis of variance (ANOVA) and Tukey's post hoc tests. The level of significance was set at 0.05.
Results:
The maximum CS was seen in the amalgamator-mixed samples that did not receive ultrasonic agitation. The CS value of amalgamator-mixed samples was significantly higher than manually-mixed ones (P=0.003). Ultrasonic vibration did not change the CS of specimens.
Conclusion:
According to the results, mixing with amalgamator increases the CS of CEM cement, while ultrasonic vibration had no positive effect.
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