Abstract | INTRODUCTION: 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 AND MATERIALS: 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). CONCLUSION: 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.
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Authors | Mohammad Forough Reyhani, Negin Ghasemi, Saeed Rahimi, Amin Salem Milani, Hadi Mokhtari, Sahar Shakouie, Hossein Safarvand |
Journal | Iranian endodontic journal
(Iran Endod J)
Vol. 9
Issue 4
Pg. 246-50
( 2014)
ISSN: 1735-7497 [Print] Iran |
PMID | 25386203
(Publication Type: Journal Article)
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