Bond strength of Epiphany prepared with resinous solvent

Objective: This study evaluated in vitro the bond strength of Epiphany sealer prepared with resinous solvent of Epiphany system (thinning resin), using push out test.

Methods:Forty superior canines were sectioned transversally below the cementoenamel junction to provide 4-mm-thick dentine discs that were centred in aluminum rings and embedded in acrylic resin. Root canals were prepared with tapered diamond bur. Intraradicular dentin were treated with 1% NaOCl for 30 min, 17% EDTA for 5 min and flushed with distilled water for 1 min. The specimens were randomly distributed into 4 groups (n=10) according to the filling material: GI– Epiphany followed by photopolymerization (control); GII – Epiphany without photopolymerization; GIII– Epiphany prepared with thinning followed photopolymerization and GIV– Epiphany prepared with thinning without photopolymerization. After the setting time, the specimens were submitted to the push out test in Instron machine.

Results: The highest mean value was obtained with Epiphany prepared with thinning followed photopolymerization (GIII), which was statistically different (p<0.01) from the other groups. The groups I (9.80±2.89 MPa), II (8.15±2.47 MPa) and IV (9.46±2.38 MPa) had the inferior bond strength values and were statistically similar among themselves (p>0.01).

Conclusion: The thinning resin of Epiphany system increased the bond strength of Epiphany sealer to dentin walls when followed by photopolymerization.