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 (α = 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).
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