Aluminate Coupling Agent for Bonding In-Ceram Alumina to Resin Cements

Surface treatment of CAD/CAM-generated alumina material as a coping is essential to obtain a strong bond between alumina and resin luting cement. This study evaluated the shear bond strength of three dual-cured resin luting cements {Linkmax HV (LM, GC), Panavia Fluoro Cement (PFC, Kuraray), and RelyX ARC (RXARC, 3M ESPE)} to glass-infiltrated alumina-reinforced ceramic (In-Ceram Alumina, GC) and the effect of aluminate and silane coupling agents on the bond strength. Rectangular- and disk-shaped glass-infiltrated CAD/CAM alumina materials were untreated or treated with silane coupling agent (Porcelain Bond, SCA, Kuraray) or prepared aluminate coupling agent (ACA) and then bonded together with one of the three dual-cured resin luting cements. Specimens were stored in water at 37°C for 24 hrs before shear bond strength testing. Means and SDs of shear bond strength are listed. Data were analyzed by ANOVA and Scheffe's t-test. Different superscript letters for each resin luting cement denote that surface treatments are significant different (p<0.05). LM (MPa) PFC (MPa) RXARC (MPa) Nontreatment 34.7 ± 4.7a 38.9 ± 5.7a 20.3 ± 3.5a SCA 60.4 ± 7.5b 39.2 ± 1.2a 41.8 ± 3.8b ACA 74.8 ± 10.1b 47.2 ± 4.0b 49.9 ± 5.7c Specimens treated with aluminate coupling agent regardless of the resin luting cement showed the highest shear bond strength among the three treatments. Surface treatment of glass-infiltrated alumina material by aluminate coupling agent showed significantly greater shear bond strength compared with nontreatment and silane coupling agent for the two resin luting cements (Panavia Fluoro Cement and RelyX ARC). These results suggest that the application of aluminate coupling agent to the glass-infiltrated In-Ceram Alumina surface appears to be effective for bonding between alumina and dual-cured resin luting cements. keiichi@net.nagasaki-u.ac.jp