Table 1.
Mean ΔL, Δa, Δb and mean colour change (ΔE) values after immersion in staining solution for all ceramic restorations.
| Restoration | Discoloring Solutions | ΔL | Δa | Δb | ΔE |
|---|---|---|---|---|---|
| Lithium disilicate ceramics | Coffee | −0.434 | 0.223 | −1.00 | 1.788 (1.41) |
| Green Tea | −1.583 | −0.026 | 1.111 | 2.241 (1.35) | |
| Chlorhexidine | −0.155 | 0.179 | 0.135 | 1.588 (0.97) | |
| Monolithic zirconia | Coffee | −3.560 | 0.877 | 3.493 | 5.602 (1.41) |
| Green Tea | −0.918 | 0.837 | 2.525 | 5.192 (2.18) | |
| Chlorhexidine | −1.468 | 0.584 | −1.475 | 4.866 (2.21) | |
| Bilayer zirconia | Coffee | −2.690 | 1.546 | 2.165 | 4.229 (0.54) |
| Green Tea | −0.259 | 0.187 | −0.909 | 2.191 (2.18) | |
| Chlorhexidine | −1.228 | 0.302 | −0.363 | 1.438 (0.89) |
ΔL: Mean L (lightness); Δa: Mean a(green–red); Δb: Mean b (blue–yellow); ΔE: Mean Colour change.