›› 2020, Vol. 40 ›› Issue (6): 521-525.

• Basic Research • Previous Articles     Next Articles

Efficacy of ozonated water in the decontamination of dental unit waterlines

,Juan Wang,   

  • Received:2019-11-28 Revised:2020-01-19 Online:2020-06-28 Published:2020-06-28

Abstract: Objective: To observe the efficacy of ozonated water in the decontamination of dental unit waterlines. Methods: Dental unit waterlines (DUWLs) of 4 dental chair units at the Affiliated Hospital of Stomatology NJMU were flushed and disinfected every morning by 2.0mg/L ozonated water. On the 1st,3rd,5th,8th day of the experiment, water samples were collected from triple syringes and handpieces before disinfection, immediately after disinfection, and at the end of the day. SPSS 22.0 software was used for statistical analysis. Results: The average total viable counts (TVC)tested from the water samples obtained from triple syringes and high-speed handpieces before disinfection reached (49550.00±1117.52) and (63875.00±8842.08) CFU/ml, respectively. After disinfection on the 8th day, TVC of the triple syringes and high-speed handpieces decreased to (83.25±42.99) and (591.50±177.26) CFU/ml, respectively. The average daily sterilizing rates of triple syringes and high-speed handpieces were 97.48% and 95.11%, respectively. During the experiment, the daily bacterial recovery showed a downward trend. Conclusion: DUWLs were polluted seriously. Flushing and disinfecting DUWLs with 2.0mg/L ozonated water can effectively inhibit the flora in the waterlines and improve the water quality.

Key words: dental unit waterlines, ozonated water, disinfection

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