Background This study evaluated the durability of optical properties of chameleon effect of Omnichroma and Essentia composite thermocycled in black dark drinks. 180 specimens of 10 mm diameter × 2 mm thickness from each tested composite material were prepared; Omnichroma and Essentia. 60 specimens were thermo-cycled for 2500 and 5000 cycles in Coffee and Coca-Cola in addition to Distilled water as a reference group for color change evaluation. Color change (ΔE) was calculated and water sorption and solubility were measured after thermocycling for 2500 and 5000 cycles in different dark drinks and water. The surface chemical changes were assessed by FTIR. All data were statistically analyzed. Results In all tested groups, Omnichroma recorded the highest significant color change (35.80 ± 4.13) and sorption values (8.30 ± 0.48) on the contrary the least solubility value (− 8.29 ± 0.81) in all tested drinks after thermocycling to 5000. Conclusions Color durability of Omnichroma negatively affected in dark drinks. Water sorption of Omnichroma negatively affected after aging 3 and 6 months. Water solubility might not adversely affect the color change. Thermocycling in different dark drinks adversely affected the color stability of both selected Chameleon composite types.

No abstract

No abstract