Effect of Different Water-to-Powder Ratios on the sulobility of Calcium-enriched Mixture Cem Cement

Abstract

Background: Solubility of cement is one of the most important features of cement which has a significant impact of clinical success and its stability in mouth. A variety of studies have demonstrated that the water to powder (W/P) ratio can affect the solubility of different cements. The aim of this study is to evaluate the effect of different water to powder ratios on solubility of CEM cement.

Methods & Materials: The CEM cement (bioniqueDent, Tehran, Iran) was mixed with the following ratios of water to powder including 1 to 2, 1 to 3 and 1 to 4. In other words, one gram CEM was mixed with 0.5 ml, 0.34 ml, and 0.25 ml water respectively to make the mentioned ratios. 6 samples were considered for each group. The samples were put into metal rings with internal diameter of 30 mm and 2 mm height and the samples’ weight was measured using digital scale, before and after dipping in water and the solubility of the samples was determined in one and four weeks later. Then, analysis of the data was done by SPSS version 24. The repeated measures ANNOVA analysis was performed to compare the quantitative variables and p value < 0.05 was considered as significance level.

Results: Mean primary dry weight of samples in ½ W/P ratio group was 0.46 +/- 0.05, in 1/3 W/P ratio group was 0.49 +/- 0.02, and in ¼ W/P ratio group was 0.48 +/- 0.03. There was no significant difference among groups in terms of primary dry weight (p=0.264). The highest solubility at one week was in ½ W/P ratio group and the least was in ¼ W/P ratio group. There was a significant difference between groups (p=0.001). Also, the highest solubility as 4th week was in ½ W/P ratio group and the least was in ¼ W/P ratio group. There was a significant difference between groups (p=0.001). Conclusion: Considering the limitations of this study, the results demonstrated that by increasing the ratio of water to powder, the solubility will increase in CEM cement.