Effect of Adding Silica Nanoparticles on the Physicochemical Properties, Antimicrobial Action, and the Hardness of Dental Stone Type 4

Table 1

Inhibition zone measurements for the groups (0%, 0.5%, 1%, and 2%) and the positive controls against S. aureus and E. coli.

Samples	Inhibition zone (mm)
	E. coli	S. aureus
0% silica NPs as negative control group	0	0
0.5% silica NPs	8.92 ± 0.09	9.10 ± 0.08
1% silica NPs	10.00 ± 0.25	11.36 ± 0.40
2% silica NPs	13.95 ± 0.10	15.26 ± 0.19
SS	377.2	377.2
DF	3	3
MS	125.7	125.7
F	32521	33091
P-value	<0.0001	<0.0001
Vancomycin (positive control group for gram-positive bacteria)	—	18.23 ± 0.2
Rifampicin (positive control group for gram-negative bacteria)	17.50 ± 0.09	—