Effects of White Chicken Eggshell Powder on Compressive Strength, Water Solubility, and Setting Time of Calcium-Enriched Mixture.

INTRODUCTION: The present study aimed to evaluate the effects of adding chicken eggshell powder (CESP) to calcium-enriched mixture (CEM) cement on its compressive strength (CS), solubility, and setting time.

MATERIALS AND METHODS: In this study, CESP was added at weight percentages of 3% and 5% to the powder component of the CEM cement. To measure the CS, a total of 36 samples (height, 6 mm; diameter, 4 mm) were tested in a universal testing machine. The setting time was assessed for 18 disk-shaped samples (diameter, 10 mm; height, 1 mm). Additionally, solubility test was performed on 18 samples (diameter, 8 mm; height, 1 mm) after 24 hours, 72 hours, seven days, and 14 days under dehydration conditions by calculating the weight changes; the results were then subjected to a normality test. Next, for the comparison of different test groups, parametric ANOVA test and post-hoc Tukey's multiple comparison test were performed at a significance level of 0.05.

RESULTS: The addition of 5% CESP to the CEM cement significantly reduced its setting time and water solubility ( P =0.02 and P =0.01, respectively). Moreover, it significantly increased the CS over a 21-day period ( P <0.001). Additionally, the addition of 3% CESP also resulted in a significant increase in CS ( P <0.001). While 3% CESP reduced setting time and water solubility, the difference was not statistically significant.

CONCLUSION: The findings suggest that the addition of 5% CESP to CEM cement has the potential to improve its sealing ability, durability, and ability to withstand chewing forces in endodontic treatments. These results highlight the relevance of CESP as an additive for cement modifications and indicate its potential clinical implications.