Author/Authors :
Carvalho, Ceci Nunes Dental School - CEUMA University - São Luís - Maranhão, Brazil , Grazziotin-Soares, Renata Discipline of Endodontics College of Dentistry University of Saskatchewan - SK, Canada , Miranda Candeiro, George Táccio de Dental Sciences Post-graduation Program - Course of Dentistry - Universitary Center Christus - Fortaleza, Brazil , Martinez, Luis Gallego Center of Materials Science and Technology - Energy and Nuclear Research Institute (IPEN) - São Paulo, Brazil , Souza, Juliana Pereira de Center of Materials Science and Technology - Energy and Nuclear Research Institute (IPEN) - São Paulo, Brazil , Oliveira, Patrícia Santos Dental School - CEUMA University - São Luís - Maranhão, Brazil , Bauer, José Discipline of Dental Materials - School of Dentistry - Federal University of Maranhão (UFMA) - São Luís - Maranhão, Brazil , Gavini, Giulio Department of Restorative Dentistry - School of Dentistry - University of São Paulo - São Paulo, Brazil
Abstract :
Introduction: Bioactive endodontic sealers have been developed to improve the quality of
root canal obturation. EndoSequence Bioceramic (BC) Sealer is amongst calcium silicatebased
materials recently developed for permanent root canal filling. The objective of this
study was to evaluate the bioactivity of BC Sealer and its micro push-out bond strength to
dentin compared to AH-Plus (AH) sealer. Methods and Materials: To perform the micro
push-out test, 24 root canals of mandibular premolars were instrumented and divided into
two groups (n=12). Each root was cut into 4 slices and lumens of the canals were filled with
the sealers and submitted to micro push-out test. Failure mode was assessed using scanning
electron microscopy (SEM). Bioactivity of BC sealer was investigated with scanning electron
microscopy/energy-dispersive X-ray (SEM/EDS) and X-ray diffraction (XRD). Bioactivity
assessments were reported descriptively. Bond strength data were analyzed by parametric ttest
(α=5%). Results: In micro push-out test AH had higher bond strength mean values
(16.29 MPa) than BC sealer (9.48 MPa) (P<0.05). Both groups had low amount of adhesive
failure. SEM showed the presence of a mineral precipitate after 30 days and EDS analysis
showed that those precipitates have high proportion of Ca. XRD showed peaks of crystalline
phases of calcium carbonate compatible with the bioactivity. Conclusion: BC sealer showed
indications of bioactivity and lower bond strength to dentine compared to AH.
Keywords :
Bioactivity , Bioceramic , Dentine , Micro Push-Out Bond Strength , Root Canal Sealer
