The fabrication of zirconium-oxide copings and frameworks using CAD/CAM systems (e.g., Procera AllZirkon, Nobel Biocare) has gained wide popularity. Finding the proper bonding techniques to zirconium oxide, adequate bonding materials, and interbonding systems compatibility is important to the clinical community. Panavia (Kuraray), a phosphate-monomer(MDP)-containing resin cement, is the recommended cement for establishing a strong resin bond to zirconia. However, the controversy remains whether or not to utilize this cement in conjunction with silane coupling agents, especially since some bonding agents/ceramic primers (e.g., Clearfil SE Bond/Porcelain Bond Activator) contain the same adhesive phosphate monomer MDP. Objectives: This study evaluated shear bond strength of the resin cements Panavia F (Kuraray) and RelyX ARC (3M ESPE) in combination with the ceramic primers/bonding agents Clearfil SE Bond/Clearfil Porcleain Bond Activator(CSB/PBA, Kuraray) and Ceramic Primer/Single Bond (CP/SB, 3M ESPE) to sandblasted Procera AllZirkon intaglio surface after long-term storage and thermocycling. Methods: 40 Procera AllZirkon specimens were sandblasted and composite-resin cylinders were bonded to the ceramic surface with the following material combinations: Group A (Panavia/no bond), Group B (Panavia/CSB/PBA), Group C (RelyX ARC/CP/SB), Group D (RelyX ARC/CSB/PBA). After storage in distilled water for 180 d and repeated thermocycling for 12,000 cycles, shear bond strength was tested in an Instron universal testing machine. Data were analyzed using one-way ANOVA and Tukey's multiple comparison (a=0.05). Failure modes were examined with a light microscope. Results: Mean shear bond strengths were for Group D 25.1 MPa, for Group groups C (16.9 MPa) and A (17.4 MPa). Group B (20.1 MPa) ranked just below Group D but produced bond strengths that were not statistically different from the other groups. Conclusions: The MDP-containing ceramic primer/bonding agent CSB/PBA provides superior long-term resin bond in combination with either Panavia F or RelyX ARC when bonded to Procera AllZirkon intaglio surfaces.

Back to the Dental Materials: II - Adhesion-Other Program
Back to the 81st General Session of the International Association for Dental Research (June 25-28, 2003)

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