Effect of three‐liquid bonding agents on bond strength to a machine milled ceramic material

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<jats:p><jats:bold>This study determined the bond strengths of porcelain bonding systems joined to a ceramic material, with the aim of evaluating the effect of a catalyst for silane coupling as well as that of initiators for bonding agents. Two sizes of specimen were cut from ceramic blocks (Cerec 2 Vitablocs Mark II®) and then primed with either a three‐liquid self‐curing bonding agent (Clearfil Porcelain Bond®, CPB), a three‐liquid dual‐activated bonding agent (Clapearl Bonding Agent®, CBA), or their components. Unprimed specimens were also used as controls. After conditioning, the two different sized plates were bonded together with a dual‐cured luting agent (Clapearl DC®). The specimens were stored in 37 °C water for 24 h and shear bond strengths were determined. Shear testing revealed that the greatest bond strength was generated in the group consisting of ceramic material primed with CBA and exposed for 20 s prior to luting. Bond strengths of the CPB‐primed group and the CBA‐primed group without pre‐exposure were comparable, whereas the remaining groups resulted in significantly lower bond strengths than the other three groups. The priming effect was greatly enhanced when a catalyst was used with the silane coupler as compared with the application of silane alone. The results suggest that incorporation of an initiator and a catalyst for silane coupling into the bonding agent reciprocally enhances bonding between the luting agent and the ceramic material.</jats:bold></jats:p>

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