Effect of resin luting cement polymerisation mode and high powered polymerisation unit type on shear bond strength of leucite reinforced full ceramic system to dentine

Abstract

This in vitro study evaluated the effects of light polymerised (LP) and dual polymerised (DP) modes of a resin luting cement polymerised with different high powered polymerisation units on the shear bond strength of a leucite reinforced full ceramic system to dentine. Ceramic specimens (n=15) were bonded to dentine surfaces with a resin luting cement (Variolink II) in either LP or DP mode and polymerised according to one of four polymerisation profiles as follows: control group: 600 mW cm(-2) conventional halogen light, 40 s; light emitting diode polymerisation unit group: 1500 mW cm(-2) light emitting diode, 10 s; plasma arc curing (PAC) polymerisation unit 10 s group: 1370 mW cm(-2) PAC, 10 s; and PAC 3 s group: 1370 mW cm(-2) PAC, 3 s. Bond strength (MPa) data were analysed using two-way analysis of variance and Duncan's test (alpha=0.05). Polymerisation mode (p<0.01), type of light unit (p<0.01) and the interactions between the two were statistically significant (p<0.05). No significant differences were found between LP and DP modes except for the PAC 3 s group, in which the LP mode resulted in significantly lower shear bond strength values (10.43 +/- 1.02 MPa) compared with the DP mode (12.88 +/- 1.73 MPa).