Influence of endodontic sealers on the bond strength of carbon fiber posts.
OBJECTIVE
The aim of this study was to verify the influence of endodontic sealers on the bond strength of an adhesive system and a resin cement used for carbon posts cementation.


METHODS
Thirty extracted human premolars were instrumented and randomly divided into three groups according to the tested sealer: EndoFill, Sealapex, or EndoREZ. Specimens were stored at 37 degrees C. After 48 h, half of specimens were prepared to receive the post and the others after 7 days. The posts were cemented with Adper Single Bond/Rely X ARC and stored in distilled water at 37 degrees C for 7 days. After this period, the specimens were sectioned in three slices (coronal, middle, and apical). The push-out test was performed in a universal machine and the debonded area was examined in a stereomicroscope.


RESULTS
Data were submitted ANOVA and Tukey test (alpha = 0.05). The EndoFill showed lower bond strength than other sealers (p < 0.01). The EndoREZ sealer was statistically greater than other groups for coronal and middle portions and similar for apical portion (p > 0.05). Coronal and middle portions showed the best results for all groups, mainly when the canal preparation was performed after 48 h (p < 0.01). Mixed failure occurs with more frequency (55.6%) followed by failure in adhesive-dentin interface (34.4%) and adhesive-post interface (10.0%).


CONCLUSIONS
The use of EndoREZ sealer promoted higher bond strength in root coronal and middle portions when carbon post was fixed with a resin cement.
Teixeira
C S
CS
School of Dentistry, University of Ribeirão Preto, Ribeirão Preto, SP, Brazil.
Pasternak-Junior
B
B
Borges
A H
AH
Paulino
S M
SM
Sousa-Neto
M D
MD
D002244:Carbon; D000077482:Carbon Fiber; D003188:Composite Resins; D001840:Dental Bonding; D017268:Dental Prosthesis Retention; D004708:Endodontics; D006801:Humans; D010895:Pit and Fissure Sealants; D011176:Post and Core Technique; D019279:Resin Cements; D012390:Root Canal Therapy
D000077482:Carbon Fiber; D003188:Composite Resins; C481259:EndoRez; D010895:Pit and Fissure Sealants; D019279:Resin Cements; D002244:Carbon