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Frequency of microbial contamination in relation to the type of channel used for sampling. DUW were assigned to two categories, (i) Instrument channel, which included high-speed drill, micromotor and 3-in-1 syringe, and (ii) cup filler
| Instrument channel n (%) | Cup filler n (%) | p value | |
|---|---|---|---|
| Legionella contamination* | 15 (41.7) | 10 (18.6) | 0.016 |
| Pseudomonas contamination* | 1 (2.8) | 2 (3.7) | 1 |
| Increased total colony count$ | 9 (25.0) | 6 (11.1) | 0.099 |
| Total | 36 | 54 | 90 |
| * ≥1 cfu/100 ml | |||
| $ ≥100 cfu/ml | |||
