Table 3: Variation in first- and second-order parameters [mean values and (SD)].
| Parameters |
CD |
T1 |
T2 |
T3 |
T4 |
T5 |
| Mean Gray levels* |
94.4 (26,8) |
96.7 (22.1) |
99.4 (21.9) |
103.2 (25.5) |
109.7 (28.3) |
111.8 (27.1) |
| SD |
6.98 (2.83) |
6.59 (2.17) |
6.43 (2.09) |
6.37 (2.91) |
6.23 (3.11) |
6.15 (3.22) |
| Coefficient of variation* |
0.08 (0.03) |
0.06 (0.02) |
0.06 (0.02) |
0.05 (0.03) |
0.04 (0.02) |
0.05 (0.04) |
| Angular second moment |
0.03 (0.01) |
0.03 (0.01) |
0.03 (0.01) |
0.03 (0.01) |
0.03 (0.01) |
0.03 (0.01) |
| Contrast |
6.27 (2.94) |
6.29 (2.57) |
6.13 (2.67) |
6.07 (2.91) |
5.93 (3.11) |
5.86 (3.01) |
| Entropy |
4.39 (0.25) |
4.32 (0.22) |
4.35 (0.21) |
4.37 (0.28) |
4.30 (0.29) |
4.32 (0.22) |
| Correlation |
0.03 (0.02) |
0.03 (0.02) |
0.03 (0.02) |
0.03 (0.02) |
0.03 (0.02) |
0.03 (0.01) |
CD= at crowns delivery; T1, T2, T3, T4, and T5= at the1, 2, 3, 4 and 5-year evaluation, *P<0.05.