Table 3:
The mean difference in roughness of composite resin before and after 2% NF gel.
Composite Resin
Before NF
Mean ± SD
After NF
Mean ± SD
Difference
P
Value
Tetric-N-Ceram
0.226 ± 0.0496
0.2650 ± 0.0828
0.1360
Ns
Z250
0.236 ± 0.0406
0.2493 ± 0.0563
0.0203
Ns
Z350 XT
0.2127 ± 0.0422
0.2273 ± 0.0432
0.0293
Ns
*NF, Sodium Fluoride; SD, Standart Deviation Ns: no statistically different.