effect of different mixing and placement methods on the compressive strength of calcium-enriched mixture

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