Table 2.
Total discoloration (ΔE) for all test samples at three different time intervals using one way ANOVA and multiple comparison test of total discoloration (ΔE) between different test materials using Bon Ferroni correction.
| Group | Baseline- staining ΔE 1 | Staining-bleaching ΔE 2 | Bleaching-baseline ΔE 3 | Intragroup significance value (ΔE 3 versus ΔE 1) |
|---|---|---|---|---|
| Filtek Z350 | 6.3 (1.71)* | 5.76 (1.19) | 1.97 (1.39)* | *P = .000 |
| Esthet X | 6.71 (1.98)** | 6.58 (1.77) | 1.79 (1.35)** | **P = .002 |
| Admira | 4.42 (1.10)NS | 6.79 (2.09) | 3.02 (1.6)NS | NS P = .18 |
Esthet X versus Admira—P = .013. Significant = P < .001, NS = P > .05
The calculations of ΔE were as follows:
ΔE 1 = [(ΔL2−ΔL1)2+(Δa2−Δa1)2+(Δb2−Δb1)2]1/2
ΔE 2 = [(ΔL3−ΔL2)2+(Δa3−Δa2)2+(Δb3−Δb2)2]1/2
ΔE 3 = [(ΔL3−ΔL1)2+(Δa3−Δa1)2+(Δb3−Δb1)2]1/2