Color Stability and Surface Properties of PMMA/ZrO2 Nanocomposite Denture Base Material after Using Denture Cleanser
Table 4
Effect of variation in ZrO2 concentration on acrylic specimen color (ΔE), surface roughness (mμ), and hardness (VHN) after immersion in different cleansing solutions for the specific times.
Time
Nano-ZrO2 (%)
Water (W) mean (SE)
Corega (C) mean (SE)
NaOCl (S) mean (SE)
Renew (R) mean (SE)
Color
T1
0
1.51 (0.02)
0.001
2.99 (0.03)a
0.001
3.01 (0.05)a
0.286
1.92 (0.04)
0.009
2.5
1.69 (0.02)
2.98 (0.04)a
3.05 (0.07)a
1.97 (0.02)a
5
1.45 (0.01)
2.89 (0.08)
3.01 (0.05)a
1.96 (0.05)a
T2
0
1.99 (0.04)a
0.001
4.91 (0.06)a
0.04
5.9 (0.09)
0.001
3.83 (0.12)
0.001
2.5
2.04 (0.05)a
4.96 (0.05)a,b
6.85 (0.13)a
2.99 (0.07)
5
2.20 (0.03)
4.99 (0.08)b
6.91 (0.09)a
3.20 (0.06)
Roughness
T0
0
0.14 (0.02)
0.001
2.5
0.19 (0.01)
5
0.26 (0.02)
T1
0
0.14 (0.01)
0.001
0.19 (0.02)
0.001
0.24 (0.02)
0.001
0.18 (0.02)
0.001
2.5
0.17 (0.02)
0.23 (0.02)
0.33 (0.02)a
0.21 (0.01)
5
0.24 (0.02)
0.27 (0.0)
0.34 (0.02)a
0.26 (0.01)
T2
0
0.14 (0.01)
0.001
0.23 (0.01)
0.001
0.36 (0.01)
0.001
0.20 (0.02)
0.001
2.5
0.19 (0.01)
0.27 (0.02)
0.39 (0.02)a
0.26 (0.02)
5
0.25 (0.01)
0.33 (0.02)
0.39 (0.01)a
0.29 (0.02)
Hardness
T0
0
30.63 (1.68)
0.001
2.5
38.77 (1.42)
5
41.62 (1.44)
T1
0
31.05 (1.34)
0.001
27.79 (1.37)
0.001
25.17 (1.06)
0.001
28.84 (1.1)
0.001
2.5
38.64 (1.76)
34.85 (1.23)
34.29 (1.26)a
39.59 (1.07)a
5
41.46 (1.46)
40.82 (1.4)
35.22 (1.2)a
38.8 (1.21)a
T2
0
30.30 (1.27)
0.001
25.68 (1.3)
0.001
24.16 (1.36)
0.001
27.29 (1.43)
0.001
2.5
39.07 (0.97)
33.11 (0.84)
31.54 (1.58)a
36.76 (1.1)a
5
41.13 (1.27)
37.45 (1.45)
30.27 (1.32)a
36.07 (1.2)a
Significant difference at α = 0.05. The same letter indicates nonsignificant vertically per concentration ().T0 = 2 days of immersion, T1 = 180 days of immersion, T2 = 365 days of immersion, 0% = pure acrylic resin, 2.5%, acrylic resin reinforced with 2.5% nano-ZrO2, 5% = acrylic resin reinforced with 5% nano-ZrO2. The same small letters indicated nonsignificant vertically per time.
