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Mann–Whitney test used to compare three gingival retraction systems with each other (multiple comparisons) with relation to hemorrhage scores
| Retraction systems | Number of abutments | Mean rank | P value |
|---|---|---|---|
| Stay-put | 20 | 30.38 | <0.001* |
| Expasyl | 20 | 10.63 | |
| Stay-put | 20 | 28.88 | <0.001* |
| Magic foam cord | 20 | 12.13 | |
| Expasyl | 20 | 14.5 | <0.001* |
| Magic foam cord | 20 | 26.5 |
