Push-Out Bond Strength of Dorifill, Epiphany and MTA-Fillapex Sealers to Root Canal Dentin with and without Smear Layer.
BACKGROUND
The aim of the present experimental study was to evaluate the push-out bond strength of Dorifill, Epiphany and MTA-Fillapex sealers to root canal dentin in presence and absence of smear layer (SL).


METHODS
Sixty human single-rooted teeth were selected and divided into six groups (n=10). The canal irrigation protocol in groups 1, 3 and 5 consisted of 2.5% NaOCl during instrumentation and normal saline at the end of preparation plus a 5-min irrigation with 17% ethylenediaminetetraacetic acid (EDTA). In the remaining groups, normal saline was used for canal irrigation. The root canals were filled with Epiphany/Resilon (groups 1 and 2), Dorifill/gutta-percha (groups 3 and 4) and MTA-Fillapex/gutta-percha (groups 5 and 6). After two weeks of storage in 95% relative humidity at 37(º)C, 2 mm-thick dentin disks were prepared from coronal third of each root. The push-out bond strength test was carried out using a universal testing machine. Data were analyzed with the two-way ANOVA and post hoc Tukey's tests. Statistical significance was defined at 0.05.


RESULTS
The highest (3.06±0.38 MPa) and lowest (1.16±0.32 MPa) push-out bond strength values were recorded in Epiphany/Resilon-NaOCl/EDTA and Dorifill/gutta-percha/normal saline groups, respectively. There were significant differences in the bond strength of sealers (P<0.05). In addition, elimination of the SL significantly increased the bond strength of all sealers (P<0.05).


CONCLUSIONS
The Epiphany/Resilon group exhibited the highest push-out bond strength in the presence and absence of the SL. Elimination of the SL resulted in a significant increase in the bond strength of all the sealers to dentin.
Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
Mohammad
M
Forough Reyhani
Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
Negin
N
Ghasemi
Dental and Periodontal Research Center, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
Saeed
S
Rahimi
Dental and Periodontal Research Center, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
Amin
A
Salem Milani
Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
Hadi
H
Mokhtari
Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
Sahar
S
Shakouie
Private Practice, Tabriz, Iran.
Hossein
H
Safarvand
Dorifill; Epiphany Sealer; MTA-Fillapex; Push-Out Bond Strength; Root Canal; Smear Layer