Disinfection effects comparation of continuous and regular disinfection with hydrogen peroxide-silver ion disinfectant on dental unit waterlines
Objective To compare the disinfection effects of continuous and regular disinfection with 5%hydrogen peroxide-silver ion disinfectant on controlling the pollution of dental unit waterlines(DUWLs).Methods Twenty DUWLs in a hospital were selected as the research objects.They were randomly divided into a regular disinfection group(once a week)and a continuous disinfection group(once a day,after the daily diagnosis and treatment),with 10 units in each group.Both groups were disinfected with 5%hydrogen peroxide-silver ion disinfectant.The changes in the types and numbers of bacteria in water samples from high-speed handpieces,three-in-one spray guns,and mouthwash outlets were detected before disinfection and on the 1st-7th days(d1-d7)after disinfection.Results A total of 45 strains were isolated in this experiment.The top three in proportion were Sphingobacterium paucimobilis(33.33%),Burkholderia gladioli(20.00%),and Ralstonia pickettii(17.78%);before disinfection,on d1 and d2 after disinfection,there was no statistical significance in the differences in the number of bacteria in water samples from high-speed handpieces,three-in-one spray guns,and mouthwash outlets between the two groups(P>0.05);on d3-d7 after disinfection,the number of bacteria in water samples from high-speed handpieces,three-in-one spray guns,and mouthwash outlets in the continuous disinfection group was lower than that in the regular disinfection group,and the difference was statistically significant(P<0.05).Conclusion Compared with continuous disinfection,regular disinfection once every 2 days has higher application value.
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