Aim: to evaluate the influence of immersion time in coffee staining solution on the color coordinates of two Zirconia-containing indirect aesthetic materials.
Material and methods: 20 Discs were used in the current study; samples have been divided into two groups in accordance with the material used (monolithic Zirconia restoration group [Zirconia] and indirect Zirconia silicate filled composite restoration group [Ceramage]. The samples were prepared and then immersed in coffee [staining solution]. Spectrophotome‌tric analysis was made immediately after manufacturing of discs at (T0), at 7days (T1), 14 days (T2) and at 21days.
Results: At T0-T1, T1-T2, T0-T2 and T0-T3, the mean ΔE of Zirconia showed statistically significantly lower value than Ceramage. At T2-T3; no statistically significant difference between mean ΔE of the two ceramic types was found (P-value = 0.155, Effect size = 0.235). Regardless of time; Zirconia showed a statistically significant lower mean ΔE than Ceramage after staining protocol.
Conclusion: The ΔEs of tes‌ted CAD/CAM Zirconia ceramics is considered color stable in comparison to zirconia filled composite (Ceramage), and better resistant to external coffee staining. Color difference (ΔE) between different test specimens at different immersion or contact/time in coffee drinks showed clinically un acceptable range above 3.3 units). Thus, Zirconia filled lab composite is not aesthetically stable in color. Further studies are required to assess the color stability of different zirconia containing indirect restorative materials upon exposure to different oral conditions with aging inside the oral cavity.