Table 2.
Color variables at the different stages and the delta in ΔE (ΔΔE) over each single phase (mean ± standard deviation, measured after 48h color stabilization). Phase 1 = first modality; phase 2 = second modality; phase 3 = combined peroxide gel & light. The white reference tile in the used measurement system obtained L∗ = 71.3; a∗ = -0.04; b∗ = 1.14.
| Group | Outcome | Baseline | Phase 1 | Phase 2 | Phase 3 |
|---|---|---|---|---|---|
| A | L∗ | 60.9 ± 3.5 | 63 ± 3.7 | 64.4 ± 3.4 | 67.3 ± 3.8 |
| a∗ | 1.3 ± 0.6 | 1.7 ± 0.5 | 0.6 ± 0.6 | 0.3 ± 0.6 | |
| b∗ | 12.0 ± 2.5 | 8.4 ± 2.7 | 2.5 ± 2.5 | 1.0 ± 2.3 | |
| ΔΔE | 4.3 ± 0.6 | 3.9 ± 1.2 | 4.7 ± 0.3 | ||
| B | L∗ | 61.0 ± 2.6 | 63.6 ± 3 | 64.3 ± 3.3 | 64.8 ± 3.6 |
| a∗ | 1.3 ± 0.6 | 0.6 ± 0.7 | 1.0 ± 0.7 | 0.8 ± 0.8 | |
| b∗ | 12.1 ± 1.8 | 8.0 ± 2.0 | 4.0 ± 2.0 | 2.2 ± 2.4 | |
| ΔΔE | 4.9 ± 1.3 | 3.8 ± 0.9 | 2.0 ± 1.4 | ||
| C | L∗ | 61.4 ± 2.6 | 69.5 ± 2.7 | ||
| a∗ | 1.3 ± 0.3 | 0.0 ± 0.4 | |||
| b∗ | 12.8 ± 1.4 | 1.9 ± 1.1 | |||
| ΔΔE | 13.7 ± 2.5 | ||||
| D | L∗ | 60.1 ± 2.4 | 67.7 ± 3.3 | 63.8 ± 1.8 | 70.4 ± 3.0 |
| a∗ | 1.2 ± 0.4 | -0.3 ± 0.5 | 0.5 ± 0.5 | -0.5 ± 0.4 | |
| b∗ | 12.8 ± 1.0 | 6.4 ± 1.5 | 2.7 ± 0.9 | 1.6 ± 1.0 | |
| ΔΔE | 10.9 ± 2.2 | -0.1 ± 2.6 | 4.5 ± 1.4 | ||
| E | L∗ | 61.5 ± 1.8 | 72.8 ± 2.0 | ||
| a∗ | 0.9 ± 0.7 | -0.5 ± 0.4 | |||
| b∗ | 12.5 ± 1.2 | 2.0 ± 1.1 | |||
| ΔΔE | 15.6 ± 1.9 |