Table 3:
Antibacterial effect of Ferula assa-foetida oleo-gum-resin essential oil on different bacteria based on inhibition zone diameter (mm), using the disk diffusion method
| Species | Concentrations (μg/ml)* | Chlorhexidine 0.2% | P-value | |||
|---|---|---|---|---|---|---|
| 2.5 | 5 | 10 | 20 | |||
| S. mutans | 13.5±0.10 | 13.03±0.58 | 14.07±0.58 | 15.1±0.10 | 15±0.00 | 0.009 |
| S. sanguis | 7.07±0.98 | 12.0±0.00 | 12.17±0.15 | 13.0±0.00 | 15.53±0.57 | 0.009 |
| S. sobrinus | 9.10±0.10 | 11.2±0.20 | 11.6±0.62 | 12.13±0.58 | 15.07±0.12 | 0.011 |
| S. salivarius | 13.07±0.57 | 12.08±0.58 | 13.14±0.15 | 14.03±0.20 | 15.07±0.57 | 0.009 |
| L. rhamnosus | 12.3±0.10 | 13.16±0.15 | 16.03±0.57 | 18.1±0.10 | 14.1±0.10 | 0.009 |
*
The inhibition zone diameters (mm) were measured triplicate to report the mean values. Chlorhexidine was the positive control in this test as the reference antimicrobial agent.