Effect of different water-to-powder ratios on the dimensional stability and compressive strength of mineral aggregate-based cements

Authors : Eduardo Antunes BORTOLUZZİ, Tchéli CASSEL DE ARAÚJO, Ana Carolina CORRÊA NÉİS, Michelli Cássia DOS SANTOS, Lucas Da Fonseca Roberti GARCİA1, Beatriz Dulcinéia MENDES SOUZA, Cleonice Da Silveira TEİXEİRA

Pages : 94-98

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Publication Date : 2019-05-31

Article Type : Research Paper

Abstract :Purpose The aim of this study was to evaluate the effect of different water-to-powder ratios on the dimensional stability and compressive strength of Portland cement and Mineral Trioxide Aggregate insert ignore into journalissuearticles values(MTA);. Materials and Methods Five different volumes of distilled water insert ignore into journalissuearticles values(0.26; 0.28; 0.30; 0.33 and 0.35 mL); were used for every 1 g of the cements. Twelve samples insert ignore into journalissuearticles values(12 mm long x 6 mm in diameter); were prepared in Teflon molds. After measuring the initial length, the specimens were stored in distilled water for 24 hours or 30 days. At the end of these time intervals, the specimens were measured again, and the dimensional change was calculated. The same samples used in the previous test were submitted to compression in a universal test machine insert ignore into journalissuearticles values(1 mm/min-1);. Results Analysis of the dimensional stability results showed no statistical difference between the cements, proportions and time intervals tested, or between their interactions. After 24 hours, MTA was more resistant than Portland cement insert ignore into journalissuearticles values(p<0.05);. At 30 day-period, both cements had similar, and significantly higher resistance than they did at 24 hours insert ignore into journalissuearticles values(p<0.05);. Conclusion The powder/water ratio had no influence on the dimensional stability of cements. Compressive strength of Portland cement was affected at the proportions of 0.30 and 0.35 mL/g. 
Keywords : Portland cement, mineral trioxide aggregate, dimensional stability, compressive strength