Comamonas acidovorans contamination of dental unit waters

A Study was carried out to evaluate the extent of the colonization of denta l water systems by Comamonas acidovorans and to investigate how the occurre nce of these bacteria is related to certain water characteristics. The 152 water samples were collected from the oral rinsing cup, air-water syringe, turbine and supply lines to dental units. Comamonas acidovorans was found m ost frequently and in greatest quantities in samples taken from water enter ing the units and in samples with a lower total bacterial count at 22 degre es C, higher temperature, lower content of organic matter and, in general, higher concentrations of residual chlorine.