Table 2:
Overall comparison between mean values of baseline surface microhardness (VHN1) and final surface microhardness (VHN2) using paired t-test.
| Groups | N |
VHN1
Mean± SD |
VHN2
Mean± SD |
Paired differences | t | df | p-value | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | Std. Deviation | Std. error mean | 95% confidence interval of the difference | ||||||||
| Lower | Upper | ||||||||||
| Group I (Control) | 10 | 311.20 ± 15.23 | 51.08 ± 5.94 | 260.120 | 9.839 | 3.111 | 253.082 | 267.158 | 83.603 | 9 | 0.0005 |
| Group II (Embrace Varnish) | 10 | 312.88 ±11.21 | 242.10 ±16.93 | 70.780 | 21.824 | 6.901 | 55.168 | 86.392 | 10.256 | 9 | 0.0005 |
| Group III (MI Varnish) | 10 | 324.10 ±18.47 | 246.40 ±7.51 | 77.700 | 17.432 | 5.512 | 65.230 | 90.170 | 14.096 | 9 | 0.0005 |
| Group IV (Profluorid Varnish) | 10 | 320.78 ±11.17 | 224.52 ±9.30 | 96.260 | 10.132 | 3.204 | 89.012 | 103.508 | 30.042 | 9 | 0.0005 |