Effect of different mixing methods on (setting time , working time , film thickness , dimensional changes) ? White Portland Cement ? (Mineral Trioxide Aggregate) White MTA CEM (Calcium Enriched Mixture)

Abstract

Introduction: MTA, CEM, PC are being used routinely for Restoration, filling channels, direct pulp capping, repair furcation perforations and apexification. The purpose of this study was to evaluate the effects of different methods of mixing (conventional, Amalgamator, Ultrasonic) on physical properties (setting time, working time, film thickness, dimensional changes) of White Portland Cement, White MTA and CEM. Materials and methods: Setting time in accordance with the recommended procedures in ISO, film thickness according to the instruction ENISO 6876:2002, dimensional changes by using cylinders filled up with materials after incubation with a digital caliper and measure with accuracy of 0.01 mm and working time was determined by measuring the diameter of the substance located between two slabs. Results: The effect of mixing method on the mean of working time, film thickness and Setting time variables is not identical in 3 types of substances. In other words, there is an interaction between the mixing method and type of material (p <0.05). In the conventional mixing method, film thickness values of CEM were higher than MTA and PC .In the ultrasonic mixing method, film thickness values of PC were higher than MTA and CEM. In the amalgamator mixing method film thickness values of MTA were higher than CEM and PC. In conventional and amalgamator methods, working time values of PC were higher than CEM and MTA and in ultrasonic method values of CEM were higher than PC and MTA. The average of setting time values at each substance in conventional method, were higher than the other two methods. Conclusion: Different methods of mixing (conventional, Amalgamator, Ultrasonic) affected on physical properties (setting time, working time, film thickness, dimensional changes) of materials (White Portland Cement, White MTA and CEM).