(PR73) Retreatability of Four Different Calcium Silicate-based Root Canal Sealers During Endodontic Retreatment: An Ex Vivo Study

Introduction: The retreatability of calcium silicate-based sealer (CSS) has been ambiguous. This study compared the retrievability of four different CSSs in a straight canal.

Methods: 85 extracted teeth with a straight root canal were decoronated to a standardized working length (WL). The canals were instrumented with hand files up to 15/.02 to achieve apical patency, and then instrumented 2 mm short of the apex with rotary files up to 35/.04. The roots were randomly divided into five groups and obturated using four different CSSs (BC: EndoSequence, CS: CeraSeal, NEO: NeoSealerFlo, AHB: Dentsply AH Plus Bioceramic, and Control: no sealer). After the placement of the CSSs, each master gutta-percha cone was placed short 2 mm from the WL. The roots were stored for seven days at 37°C and 100% humidity using HBSS. The master cones were clearly removed without solvent. Three roots of CS and one root of BC were excluded due to incomplete removal of gutta-percha. The retrievability of each CSS was measured by regaining of the patency using hand files. The operator was blinded to the sealer used. Data were analyzed using analysis of variance to compare the apical patency rates.

Results: Success rates for apical patency were in BC, CS, NEO, AHB, and Control were 37.5%, 42.9%, 82.3%, 76.5%, and 100%, respectively. There was significantly higher apical patency rates in NEO and AHB than BC and CS (p <.001).

Conclusion: NEO and AHB are more retrievable in straight canal than BC and CS.