Evaluation of zirconia–porcelain interface using X-ray diffraction

Abstract

Porcelain veneers protect zirconia dental restorations on aging but how the porcelain is applied has little effect on zirconia stability. Porcelain is added to zirconia restorations principally for cosmetic reasons, however, it is prone to chipping. The phase transformation of zirconia from a tetragonal to a monoclinic crystal structure is believed to be a contributing factor to chipping. This transformation may be influenced by the preparation conditions of the restorations and aging within the oral environment. Using X-ray diffraction, Tariq Alghazzawi and Gregg Janowski at the University of Alabama at Birmingham, US, showed that porcelain protected zirconia samples from the structural transformation under accelerated aging conditions. There was no significant difference in the protection offered between manual layering and pressing methods of porcelain application.

Keywords

aging / hydrofluoric acid / monoclinic / pressing / tetragonal / X-ray diffraction

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