Effect of colouring green stage zirconia on the adhesion of veneering ceramics with different thermal expansion coefficients

Abstract

Choosing the right combination of materials for false tooth cores and veneers could help to reduce chipping, research from Europe indicates. Zirconia ceramics are a popular alternative to metal cores in dental prosthetics because, once colored and veneered, they closely resemble natural enamel. However, chipping can occur in zirconia prosthetics after a short time. Güliz Aktas at Hacettepe University, Turkey, together with co-workers in Finland and Switzerland, analyzed the effect that the coloring of zirconia has on veneer bond strength. They also studied the different thermal expansion rates of the veneers and their adhesion to zirconia. Although coloring had no discernible effects, using a veneer with a different thermal expansion coefficient to that of the core weakened the bond between the two.

Keywords

adhesion / bond strength / colouring / thermal expansion coefficient / zirconia

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