The Role of Liners in Bonding Zirconia to Veneering Porcelain

The role of liners in adhesion of zirconia ceramic to veneering porcelain, had been tested with in vitro investigation. Twenty four bilayered ceramic specimens were made, and then tested with shear bond strength test (notched edge) to determine the form of separation and the type of fracture. The resulting values for shear strength were calculated and expressed as the strength of the connection (MPa), compared with the control samples without liner. The resulting values of the strength of adhesion vary the interval 36, 03 15, 33 MPa, 95, 00 % CI 26.29 to 45.77. The strength of the interface zirconium-ceramic veneers is significantly higher than the minimum force required in conventional metal-ceramic restorations. Thus the application of porcelain liners is a procedure that has a positive impact on shear bond strength.