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Surface structural changes of feldspathic ceramics before and after immersion in corrosive medium using Atomic Force Microscopy

Dental ceramics are attractive dental materials as a result of their superior aesthetics and biocompatibility. However, they are brittle and inclined to premature failure, especially if repeated contact strain and moist environment. Chemical stability of dental ceramics is important because it directly affects mechanical properties and aesthetic value of restorations. The aim of this study was to investigate the effects of the corrosive agent, 4% acetic acid, on the surface of glazed and unglazed feldspathic ceramics. Metal-ceramic plates (9.0 * 9.0 * 1.2 mm) composed of Ni-Cr alloy (Wiron 99, Bego Germany) and glazed or unglazed feldspathic ceramics (IPS Classic, Ivoclar-Vivadent, Schaan, Liechtenstein) were prepared according to the manufacturer's instructions. The samples were immersed in 4% acetic acid at 80°C and kept there for 16 h (ISO 6872). The surfaces of the samples before and after immersion in the corrosive medium were examined by atomic force microscopy (AFM). The pre and post-corrosion AFM images of the surfaces of the feldspathic ceramics samples clearly show that the glazed surfaces are much less prone to deterioration by corrosion than the unglazed ones.

dental ceramic ; Atomic force microscopy ; corrosion ; surface morphology ; microstructure

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