Suboptimal push-out bond strengths of calcium silicate-based sealers.
OBJECTIVE
To evaluate and compare the push-out bond strength of MTA Fillapex (Angelus, Londrina, Brazil) and iRoot SP (Innovative BioCeramix Inc., Vancouver, Canada) to the dentine walls of root canals. AH Plus (Dentsply DeTrey, Konstaz, Germany) and MTA (Angelus, Londrina, Brazil) were used as reference materials.


METHODS
Sixty extracted human single-rooted teeth were selected. After standardized canal preparation and irrigation, the canals were dried with paper points and filled with one of four sealers: AH Plus, iRoot SP, MTA and MTA Fillapex. Roots were sectioned, and push-out tests were performed. The values of bond strength were analysed using the Kruskal-Wallis test. Mann-Whitney with Bonferroni correction was used to isolate the differences. The alpha-type error was set at 0.05 for the analyses.


RESULTS
All specimens had measurable adhesion to root dentine and no premature failure occurred. There were significant differences amongst materials (P = 0.000). MTA-filled specimens had higher push-out bond strength values (P = 0.000). AH Plus had significantly higher bond strength than both Fillapex and iRoot SP (P = 0.000). Both Fillapex and iRoot SP had the lowest push-out bond strength amongst all experimental groups (P = 0.000). No difference occurred between the two calcium silicate-based root canal sealers (P = 0.265).


CONCLUSIONS
The adhesion to root dentine associated with newer calcium silicate-based sealers was compromised even when well-monitored laboratory conditions were used.
Department of Endodontics, Federal Fluminense University (UFF), Niterói, Brazil.
D S
DS
Oliveira
Department of Endodontics, Federal Fluminense University (UFF), Niterói, Brazil.
M L
ML
Cardoso
Department of Endodontics, Federal Fluminense University (UFF), Niterói, Brazil.
T F
TF
Queiroz
Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil.
E J N L
EJ
Silva
Department of Endodontics, Federal University of Maranhão (UFMA), São Luís, Brazil.
E M
EM
Souza
Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil.
G
G
De-Deus
D017607:Aluminum Compounds / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D001840:Dental Bonding; D003786:Dental Pulp Cavity; D003799:Dental Stress Analysis; D003804:Dentin; D004338:Drug Combinations; D006801:Humans; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*
D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C000621519:iRoot SP; C086631:mineral trioxide aggregate; C031293:calcium silicate
AH Plus; MTA; MTA Fillapex; iRoot; push-out bond strength