Research suggests the use of a phosphate monomer modified resin cement (Panavia 21, Kuraray) without silanization for adhesive bonding to sandblasted glass infiltrated aluminum oxide ceramic. It is unclear, whether this recommendation will also result in a durable bond to rough aluminum oxide surfaces such as the intaglio surface of Procera AllCeram (Nobel Biocare) densely sintered alumina coping. This roughness is achieved during the unique industrialized fabrication of the Procera coping. Objectives: The purpose of this study was to evaluate the shear bond strength of Panavia 21 to Procera alumina intaglio surface with and without silanization after cleaning or sandblasting. Methods: 40 samples (10x10x2 mm) of densely sintered high purity alumina with Procera AllCeram intaglio surface were randomly divided into 4 groups (n=10). The sample surfaces were either sandblasted or ultrasonically cleaned. Half of the samples were pretreated with Clearfil New Bond/Porcelain Activator (containing silane coupling agent). Composite resin cylinders were bonded with Panavia 21 TC to the alumina ceramic samples. After storage in distilled water for 3 d, shear bond strengths were 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: Without Silane treatment, mean bond strengths values were 7.76 ± 2.4 MPa after cleaning and 8.06 ± 2.1 MPa after sandblasting. For the groups with silane application, they were 16.02 ± 1.7 MPa after cleaning and 21.42 ± 4.3 MPa after sandblasting signifacantly greater (p=.01). Failure modes were 100 % adhesive. Conclusions: Without Silanization, Panavia 21 TC provided low shear bond strength to Procera AllCeram alumina intaglio surface. Silanization significantly increased bond strengths. The combination of sandblasting and silanization produced the highest bond strength.

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