Use of chlorine dioxide to disinfect dental unit waterlines

This paper describes a trial of chlorine dioxide in dental unit waterlines to produce potable quality water. Four treatment protocols using 50 ppm activated chlorine dioxide solution were tested. Each caused a short-term (<48h) decline in total viable counts but did not provide potable quality water. Intermittent use of chloride dioxide is thus not suitable for long-term decontamination of dental unit waterlines. Units should be redesigned to discourage biofilm formation, and more research into practical methods of achieving potable water is required in the interim. (C) 2001 The Hospital Infection Society.