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Comparison of ∆E of the study groups at different time points
| Group | Time | ||
|---|---|---|---|
| ∆E1 | ∆E2 |
P value (∆E1 − ∆E2) |
|
| Airflow with calcium carbonate | 5.33 ± 2.37 | 4.13 ± 3.63 | 0.021 |
| Airflow with sodium bicarbonate | 5.08 ± 3.85 | 4.57 ± 2.77 | 0.861 |
| FlexiDisc | 5.21 ± 2.72 | 4.19 ± 2.81 | 0.618 |
∆E: Color difference between the two objects calculated in the CIE L*a*b* color system
