Evaluation of the effect of different liquid to powder ratio on the compressive strength of Calcium-enriched mixture

Abstract

Calcium Enriched Mixture Cement (CEM cement) is an endodontic biomaterial that is used in the applications like furcal perforation repair and apexogenesis that in these cases, the compressive strength, which is a representative of its resistance against crushing, is important. The aim of this study is to evaluate the effect of various liquid to powder ratio on the compressive strength of this biomaterial. Methods and materials: 1g of the CEM cement was mixed with 0.5, 0.34 and 0.25ml demineralized water. The obtained mixture was transferred to the stainless steel molds. These molds have 6mm height and 4mm diameter. For each group of resulting compounds, five generator houses were considered. After holding for seven days in the incubator with 100% humidity and in the temperature of 37oC, Eventually, the maximum force exerted to the material before breakdown of the sample by Universal device was recorded in terms of Newton. Statistical analysis: After descriptive statistics (mean and standard deviation) were done. In order to study the normal distribution of data, the Kolmogorov–Smirnov test was used. The comparison of the obtained results from groups due to normal distribution was carried out by using one-way ANOVA. Statistical analysis was done by SPSS.V.17 software. Results: The maximum compressive strength in the first group was observed with the powder to liquid ratio of ½, and the minimum value was observed in the third group with the powder to liquid ratio of ¼. There is no significant statistical difference between the compressive strength of various groups. Conclusion: Due to the limitations of the current study, the variation of liquid to powder ratio doesn’t have any effect on the compressive strength of the CEM Cement.