Table 4. CFU in waterlines of dental units.
| Experimental category | CFU |
| Category I | 361.81±15.21 |
| Category II | 279.81 ±27.81 |
| Category III | 354.81±16.32 |
| Category IV | 281.92 ±28.92 |
| Category V | 680.1 ±42.51 |
| P | <0.05 |
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