Water-quality of Westbrabantse dental units and the effect of flushing

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Journal: Ned Tijdschr Tandheelkd 2002/09/06
Published: 2002
Authors: Teixeira, R. M.
Address: teixeira@wish.net

Dutch literature is not very clear about whether or not the effluent water/spray of handpieces of dental units meets the Dutch standards of potable water (< 200 CFU/ml and no pathogens). To improve the quality of dental unit water, flushing or purging the waterlines is recommended. In this study the quality of the effluent water/spray of 9 dental units was measured at the beginning of the day before and after 2 minutes flushing (sample size 25 ml) and the end of the day before and after 20 seconds flushing (sample size 5 ml). All units easily met the potable water standards after 2 minutes flushing, but after 20 seconds the effect was less impressive. The overall larger number of bacteria found after 20 seconds flushing can be explained as a matter of chance, whether or not a by turbulence loosened part of the biofilm has entered the small sample taken.

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