Defense Date


Document Type


Degree Name

Master of Science in Dentistry



First Advisor

Garry L. Myers, DDS

Second Advisor

Caroline K.Carrico, PhD

Third Advisor

Steven M. Marinelli, DDS


Purpose: In recent years, bioceramic sealers (BCS), such as EndoSequence BC Sealer, have gained popularity in endodontic practices. Previous research has found BCS difficult to remove from canals during retreatments when compared with other endodontic sealers. Acidic solutions have been found to inhibit the set of BCS and increase their solubility. The purpose of this study was to evaluate the efficacy of acidic solutions in the removal of BCS as compared with a traditional retreatment solvent.

Methods: Roots of extracted human single rooted teeth (N=15) were prepared into 17 mm sections, then instrumented with ProTaper Gold (PTG) rotary files up to size F4. The canals were obturated 2 mm short of working length with gutta-percha (GP) and BCS using a single cone. The teeth were randomly assigned into 3 groups (N = 5/group) based on solution: chloroform, 5% acetic acid, or 37% phosphoric acid. GP was removed using ProTaper Universal Retreament files without solvent. The canals were filled with solution, then filed with PTG F1 to F4 to working length (WL). The time taken to regain WL and the ability to regain patency were evaluated. Differences in procedure time for the three different solutions were assessed using Kruskal-Wallis test.

Results: Patency was achieved for 100% of samples treated with acetic acid and phosphoric acid, and for 80% of teeth treated with chloroform. The time to reach WL for acetic acid was significantly faster than chloroform and phosphoric acid (P<.05).

Conclusions: Acetic acid significantly improved the ability to retreat canals filled using BCS.


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