i ntroduction: the aim of the present study was to evaluate whether adding 2% chlorhexidine (chx) and 2.6% sodium hypochlorite (naocl) to calcium-enriched mixture (cem) cement would affect its setting time (st), or not. methods and materials: in this study, the setting time of cem cement was evaluated in three groups ( n =9) as follows: group 1; cem cement, group 2; cem cement+2% chx and group ...

this article addresses the interplay between heat of hydration and physico-mechanical properties of calcium sulfate hemi-hydrate in the presence of retarding additives such as citric and malic acids and sodium citrate. the heat of hydration was measured using a semi-isothermal calorimeter. results proved that citric and malic acids had superior impact on hydration and mechanical properties. whi...

objective: previous studies have demonstrated that dental stone casts can be disinfected by replacing 10v% of required water with 5.25% sodium hypochlorite solution. this comparative study evaluated physical properties of dental stone models produced by replacing distilled water with sodium hypochlorite.   methods: in this in-vitro experimental study, a total of 45 dental stone models were prod...

Students of social movements have long struggled with the question how relatively abstract political opportunities, such as elite divisions, affect unorganized activists without much knowledge of politics. We argue that the relationship between institutional opportunities and decisions to mobilize may take the form of trickle-down politics. In this view activists are affected by political oppor...

customer service level is of prime importance in today competitive world and has various dimensions with delivery quality being one of the most important ones. delivery quality has several parameters such as deliver time window options, time window size, etc. in this paper we focus on one of these parameters, namely time window setting. it has a direct impact upon customer satisfaction and busi...

introduction: the aim of the present study was to evaluate the effect of different mixing techniques (conventional, amalgamator and ultrasonic mixing) on the physical properties the working time (wt), setting time (st), dimensional changes (dc) and film thickness (ft)] of calcium-enriched mixture (cem) cement and mineral trioxide aggregate (mta). methods and materials: the mentioned physical pr...