Group B1 Control group | Group B2 (1.5% ZrO2( | Group B3 (3% ZrO2( | Group B4 (5% ZrO2( | Group B5 (7% ZrO2( | P-value | |||||
Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
2.30b | 0.158 | 2.47b | 0.37 | 3.54a | 0.08 | 3.73a | 0.14 | 3.82a | 0.16 | 0.000* |