TABLE 1. Mean values and standard deviations of ΔE, ΔL*, Δa*, and Δb* according to bleaching time and agent.
| 7 days | 14 days | 21 days | ||
|---|---|---|---|---|
| ΔE | CP10 | 10.22 (3.60) | 10.72 (3.38) | 11.63 (3.34) |
| CP16 | 12.35 (3.16) | 12.92 (3.32) | 14.05 (3.61) | |
| HP6.5 | 7.14 (3.22) | 7.51 (3.24) | 9.37 (3.52) | |
| ΔL* | CP10 | 8.36 (4.69) | 8.36 (4.46) | 9.04 (4.46) |
| CP16 | 11.75 (3.54) | 11.27(4.24) | 12.39(4.35) | |
| HP6.5 | 5.81 (3.74) | 5.44(3.99) | 7.23(4.58) | |
| Δa* | CP10 | 0.39 (0.82) | 0.30 (0.72) | 0.29 (1.05) |
| CP16 | -0.52 (0.87) | -0.68 (0.89) | -0.61 (0.88) | |
| HP6.5 | 0.21 (0.91) | 0.06 (0.85) | 0.02 (0.75) | |
| Δb* | CP10 | -4.54 (2.47) | -5.61 (2.50) | -6.19 (2.73) |
| CP16 | -3.76 (1.51) | -5.49 (1.68) | -5.80 (2.13) | |
| HP6.5 | -3.57 (0.79) | -4.47 (1.25) | -4.92 (1.97) |