Defense Date


Document Type


Degree Name

Master of Science in Dentistry



First Advisor

Dr. Garry Myers

Second Advisor

Caroline Carrico

Third Advisor

Steven Marinelli


Introduction: With growing use of bioceramic sealers (BCS) in root canal therapy, there have been challenges when retreating BCS cases. Weak acids may be effective in removing BCS and their efficacy as a solvent can be measured by their influence on the microhardness of BCS. Microhardness can be used as an indirect measurement of material hardness. The purpose of this study was to investigate the microhardness of BCS when placed in contact with various acidic solutions to assess their potential use as a solvent for retreatment procedures.

Methods: EndoSequence BC Sealer (Brasseler USA) was injected into four 10 × 3mm silicone rings and allowed to set for 48 hours. The BCS disks were then immersed in water, 17% ETDA, 5% acetic acid (AA), or 5% citric acid (CA) for 5 minutes each. A Vickers microhardness tester was then used to determine the microhardness of the samples by obtaining 10 measurements per solution. One-way ANOVA and Tukey’s multiple comparison tests were conducted to determine significant differences in microhardness according to the various solutions for the BCS material; P < .0001 was considered to be statistically significant.

Results:The average Vickers hardness value for BCS samples tested in water, EDTA, AA, and CA were 13.0, 9.7, 8.1, and 3.9 respectfully. There were significant differences in average microhardness across the 4 groups (p

Conclusions: Citric Acid appears to be a promising solvent for retreatment cases involving BCS.


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