Susceptibility of bacteria isolated from dental unit waterlines to disinfecting chemical agents

The Journal of General and Applied Microbiology
Hye Young Yoon, Si Young Lee

Abstract

Susceptibility testing of bacteria to disinfecting chemical agents isolated from dental unit waterlines (DUWL) is necessary for the development of effective disinfectant products. However, until now, susceptibility tests for chemical agents, which are components of DUWL disinfectant products, have not been conducted on bacteria isolated from DUWL water. The aim of this study was to evaluate and compare the susceptibilities of DUWL isolates in planktonic and biofilm states to cetylpyridinium chloride, as well as to the four chemical agents currently used for DUWL management. A total of 56 isolates, including 12 genera, were identified by 16S rDNA sequencing, and one strain of each genus was selected for susceptibility testing. A total of 12 isolates were used for the susceptibility tests. We determined the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) for the planktonic state and the minimum biofilm inhibitory concentration (MBIC) and minimum biofilm eradication concentration (MBEC) for the biofilm state using microtiter plates. MIC, MBC, MBIC, and MBEC of the 12 isolates for ethanol were the highest, followed by sodium hypochlorite, hydrogen peroxide, and chlorhexidine. Similar to chlorhexi...Continue Reading

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Citations

Sep 17, 2020·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Reza Eftekhar AshtianiAmirali Zandinejad

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