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Statistical test for the change in all colour variables (L, A, B, C, and H) in permanent teeth.
| Colour variables | Mean rank (pumice group) | Z (pumice group) | p value (pumice group) | Mean rank (Juglans regia group) | Z (Juglans regia group) | p value (Juglans regia group) |
|---|---|---|---|---|---|---|
| L | 5.67 | 0.663 | 0.507 | 6.00 | 2.090 |
|
| A | 5.00 | 1.790 | 0.074 | 4.33 | 1.120 | 0.263 |
| B | 5.03 | 1.173 | 0.241 | 4.80 | 0.357 | 0.721 |
| C | 4.05 | 0.969 | 0.333 | 6.25 | 0.255 | 0.799 |
| H | 6.67 | 1.275 | 0.202 | 7.31 | 0.918 | 0.359 |
