Dental unit water: bacterial decontamination of old and new dental units by flushing water

International Journal of Dental Hygiene
E WatanabeIy Ito

Abstract

To evaluate by means of Petrifilmtrade mark system (3M, St Paul, MN, USA) the level of bacterial contamination in water from old and new dental units (air-water syringes and high-speed turbines) before and after flushing water through waterlines. The old dental units had been used for 13 years and the new dental units for 1 year. A fast method named Petrifilmtrade mark AC (3M) was employed to evaluate the level of water contamination with total aerobic bacteria and Petrifilmtrade mark EC for Escherichia coli and coliforms. Dental unit water were collected before and after flushing of 4 (air-water syringes) and 2 min (high-speed turbines) from 24 old and new dental units. Thereafter, samples were diluted, inoculated onto Petrifilmtrade mark plates and incubated. The filtered tap water that filled up dental unit reservoirs showed a low level of bacterial contamination (4 and 15 CFU ml(-1)). However, all water samples from old and new dental units were highly contaminated. The flushing of dental unit waterlines reduced the bacterial count in all dental unit water, but the reduction was better in water from new dental units than from old dental units. E. coli and coliforms were not detected in any water samples analysed. Flushing w...Continue Reading

References

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Citations

Oct 19, 2011·Future Microbiology·Mary J O'DonnellDavid C Coleman
Aug 27, 2016·Journal of Conservative Dentistry : JCD·Irfana Fathima ShajahanR Selvarajan
Jun 27, 2014·The Bulletin of Tokyo Dental College·Miho KomachiyaKuroiwa Akihiro

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