Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics

This study was performed to evaluate the color stability and surface topography of two esthetic hybrid ceramics when subjected to artificial aging in beverages with different pH values, A total of 42 samples were sliced by the aid of the Isomet 4000. The materials were divided into two main groups, each group composed of 21 samples. Group 1: Lava ultimate resin nanofilled ceramic. Group 2: vita enamic resin infiltrated hybrid ceramic. Each group were further subdivided into three subgroups with 7 samples in each, according to the type of the immersion media and were randomly allocated. Subgroup artificial saliva, subgroup coca cola, subgroup coffee. For quantitative analysis of the surface roughness a stylus profilometer was used. For the color assessment a spectrophotometer was used. Color and surface roughness measurements were recorded at different intervals: Before the artificial aging of the samples (baseline data), after 12 days artificial aging of the samples, after 24 days artificial aging of the samples. It was found that lava ultimate showed statistically significant (P {u2264} 0.05) higher color change in all immersion solutions than the vita enamic as indicated by the repeated measures ANOVA test, followed by the bonferroni{u2019}s post-hoc test for pair-wise comparisons

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