Table 4:
The mean difference in roughness of composite resin before and after 1,23% APF gel.
Composite Resin
Before APF
Mean ± SD
After APF
Mean ± SD
Difference
P
Value
Tetric-N-Ceram
0.2922 ± 0.0644
0.4810 ± 0.1555
0.2057
< 0,01
Z250
0.2663 ± 0.0357
0.3997 ± 0.0828
0.1700
< 0,01
Z350 XT
0.2297 ± 0.0442
0.3157 ± 0.0693
0.1360
<0,05
*APF, Acidulated Phosphate Fluoride; SD, Standart Deviation.