The effects of sodium hypochlorite and ethylenediaminetetraacetic acid on the microhardness of Mineral Trioxide Aggregate and TotalFill Bioceramic Putty

This study aimed to evaluate the effects of 5% Na OC l and 17% EDTA on the Vickers microhardness of Mineral Trioxide Aggregate, MTA Angelus (MTAA), and TotalFill Bioceramic Putty ( BCP ) after 24 h and 8 days. Twenty‐four samples of MTAA and BCP were tested for baseline microhardness at 24 h. They were divided into four subgroups (5% NaOCl or 17% EDTA , 24 h, 5% Na OC l or 17% EDTA at 8 days) and microhardness was evaluated at different time‐points. Results were recorded and analysed statistically via one‐way anova Kruskal–Wallis test and post hoc uncorrected Dunn's multiple comparison test. MTAA had a higher baseline microhardness than BCP . Na OC l reduced the microhardness of MTAA but increased that of BCP . EDTA reduced the microhardness for both materials at 24 h. At 8 days, EDTA reduced the microhardness of MTAA , while BCP exhibited an increase in microhardness. Enabling these materials to set for a week prior to exposure to irrigants improves their microhardness.