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Mann-Whitney post hoc pairwise comparison between the mean color changes recorded in different groups.
| Decoloring Solutions | Group | Glass Ceramic | Monolithic Zirconia | Bilayer Zirconia |
|---|---|---|---|---|
| Coffee | LD ceramics | - | 0.000 | 0.000 |
| Monolithic zirconia | 0.000 | - | 0.018 | |
| Bilayer Zirconia | 0.000 | 0.019 | - | |
| Green Tea | LD ceramics | - | 0.008 | 0.288 |
| Monolithic zirconia | 0.008 | - | 0.008 | |
| Bilayer Zirconia | 0.288 | 0.008 | - | |
| Chlorhexidine | LD ceramics | - | 0.003 | 0.579 |
| Monolithic zirconia | 0.003 | - | 0.002 | |
| Bilayer Zirconia | 0.579 | 0.002 | - |
