Abstract
BackgroundThe Portland cement is hydrophilic cement; as a result, the powder-to-liquid ratio affects the properties of the final mix. In addition, the mixing technique affects hydration. The aim of this study was to evaluate the effect of different mixing techniques (conventional, amalgamator and ultrasonic) on some selective physical properties of Portland cement.Material and MethodsThe physical properties to be evaluated were determined using the ISO 6786:2001 specification. One hundred sixty two samples of Portland cement were prepared for three mixing techniques for each physical property (each 6 samples). Data were analyzed using descriptive statistics, one-way ANOVA and post hoc Tukey tests. Statistical significance was set at P<0.05.ResultsThe mixing technique had no significant effect on the compressive strength, film thickness and flow of Portland cement (P>0.05). Dimensional changes (shrinkage), solubility and pH increased significantly by amalgamator and ultrasonic mixing techniques (P<0.05). The ultrasonic technique significantly decreased working time, and the amalgamator and ultrasonic techniques significantly decreased the setting time (P<0.05).ConclusionsThe mixing technique exerted no significant effect on the flow, film thickness and compressive strength of Portland cement samples. Key words:Physical properties, Portland cement, mixing methods.
Highlights
Portland cement is the main ingredient of Mineral Trioxide Aggregate (MTA)
The results showed that the mixing technique, except for manual mixing, increased pH and shrinkage and decreased the setting time and working time; other physical properties were not affected
Alkaline pH is important for hard tissue induction and antimicrobial activity considering that resistant endodontic bacteria, such as Enterococcus faecalis, are destroyed at a pH values over 11 [17]
Summary
Various studies have comprised the properties of Portland cement (PC) with MTA [4,5,6,7,8,9]. The results have shown no differences in the antibacterial activities of these two materials [8]. The aim of this study was to evaluate the effect of different mixing techniques (conventional, amalgamator and ultrasonic) on some selective physical properties of Portland cement. One hundred sixty two samples of Portland cement were prepared for three mixing techniques for each physical property (each 6 samples). Results: The mixing technique had no significant effect on the compressive strength, film thickness and flow of Portland cement (P>0.05). Conclusions: The mixing technique exerted no significant effect on the flow, film thickness and compressive strength of Portland cement samples
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