الفهرس 
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Abstract
Aim: The aim of the study was to compare the effect of amine free MDP-containing dual cured
universal self-adhesive resin cement versus light cured resin cement on the final color of monolithic
high translucent zirconia before and after thermocycling.
Methodology: A total of 20 translucent zirconia discs, shade A2 (0.5 mm thickness, 9.5 mm
diameter) were constructed, air abraded and randomly divided in two groups (n=10) according to
the type of cement used: group CH: Cemented by choice 2 (light cured resin cement), group ZC:
Cemented by ZR-Cem (amine-free MDP- containing dual cured self-adhesive resin cement).
Specimens were cemented to PMMA disc, and subjected to thermocycling. Color change was then
assessed using laboratory spectrophotometer. After testing for normality, collected data revealed
parametric distribution and were expressed as mean and SD, data were statistically analyzed using
independent t-test at a level of significance (P < 0.05).
Results: After cementation, the color change was significantly lower in group ZC (ΔE=2) than in
group CH (ΔE = 3.8). however, after thermocycling, it was significantly higher in group ZC (ΔE=
3.63) than group CH (ΔE= 2.47), although within the clinically accepted range.
Conclusion: Resin cement type and aging affect the final color of thin high translucent zirconia
restorations. Light cure resin cement has more resistance to artificial aging compared to amine free
MDP-containing dual cured resin cement.
Keywords: Translucent zirconia, thermocycling, color, resin cement, MDP.