Table 2.
Means and standard deviation values for color change (ΔE) for all subgroups of the two composites in shade A2.
| Variable | Material | Bleaching agents | Mean ΔE | SD | Regression analysis for materials | Regression analysis for bleach agents |
|---|---|---|---|---|---|---|
| After first bleach | Durafil VS | Beyond | 1.97 | 0.45 | 0.976 | 0.009* |
| Luma | 1.07 | 0.47 | ||||
| Opal XB | 0.56 | 0.014 | ||||
| TPH3 | Beyond | 1.28 | 0.056 | |||
| Luma | 0.84 | 0.12 | ||||
| Opal XB | 1.47 | 0.3 | ||||
| After staining | Durafil VS | Beyond | 2.95(–) | 0.29 | 0.15 | 0.025* |
| Luma | 3.40(–) | 0.24 | ||||
| Opal XB | 2.02(–) | 0.73 | ||||
| TPH3 | Beyond | 2.04(–) | 0.36 | |||
| Luma | 2.82(–) | 0.18 | ||||
| Opal XB | 2.54(–) | 0.13 | ||||
| After second bleach | Durafil VS | Beyond | 2.02 | 0.58 | 0.302 | 0.986 |
| Luma | 1.78 | 0.03 | ||||
| Opal XB | 1.38 | 0.79 | ||||
| TPH3 | Beyond | 1.14 | 0.65 | |||
| Luma | 1.43 | 0.27 | ||||
| Opal XB | 1.72 | 0.02 | ||||
| Between staining and second bleach | Durafil VS | Beyond | 3.11 | 0.98 | 0.036* | 0.007* |
| Luma | 2.73 | 0.47 | ||||
| Opal XB | 0.93 | 0.24 | ||||
| TPH3 | Beyond | 1.64 | 0.23 | |||
| Luma | 1.8 | 0.26 | ||||
| Opal XB | 1.42 | 0.05 | ||||
*:
Significant at P≤.05