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

The shade selection for indirect restorations is connected to the perception of chromatic hues of dental structures, cement and restorative material. Composite resin luting agents are the preferred materials for adhesively bonding ceramic restorations. The aim is to evaluate the time dependent color changes of adhesive resin cements bonded to ceramic with different curing modes This study was carried out on three groups of 15 samples of all ceramic material (IPS E- max press ingot) and adhesive resin cement (variolink N) cured with different curing modes chemical, Light, and dual cure. The steps of the Methodology are; fabrication of the samples, grouping &labeling, cementation, artificial aging, color measurements, and statistical analysis of the measured data. The results showed that the cement type had a statistically significant effect on mean ({u2206}E) ( P- value < 0.001). Thermo cycling had a statistically significant effect on mean ({u2206}E) P- value < 0.001).The interaction between these two variables had no statistically significant effect on mean ({u2206}E) (P- value: 0.162). Conclusion: Thermocycling and curing mode affects final shade of the tested bonded all ceramic material. Light cured resin cement bonded samples showed least color change after first and second thermocycling procedure followed by self cured ones. Dual cured resin cement bonded samples showed highest color change even after first and second thermocycling

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