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http://dx.doi.org/10.17135/jdhs.2018.18.2.69

Adhesion and Biofilm Formation Abilities of Bacteria Isolated from Dental Unit Waterlines  

Yoon, Hye Young (Department of Oral Microbiology, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University)
Lee, Si Young (Department of Oral Microbiology, College of Dentistry and Research Institute of Oral Science, Gangneung-Wonju National University)
Publication Information
Journal of dental hygiene science / v.18, no.2, 2018 , pp. 69-75 More about this Journal
Abstract
The purpose of our study is to compare the adhesion and biofilm formation abilities of isolates from water discharged from dental unit waterlines (DUWLs). Bacteria were isolated from a total of 15 DUWLs. Twelve isolates were selected for the experiment. To confirm the adhesion ability of the isolates, each isolate was attached to a glass coverslip using a 12-well plate. Plates were incubated at $26^{\circ}C$ for 7 days, and the degree of adhesion of each isolate was scored. To verify the biofilm formation ability of each isolate, biofilms were allowed to form on a 96-well polystyrene flat-bottom microtiter plate. The biofilm accumulations of all isolates formed at $26^{\circ}C$ for 7 days were identified and compared. A total of 56 strains were isolated from 15 water samples including 12 genera and 31 species. Of the 56 isolates, 12 isolates were selected according to the genus and used in the experiment. Sphingomonas echinoides, Methylobacterium aquaticum, and Cupriavidus pauculus had the highest adhesion ability scores of +3 among 12 isolates. Among these three isolates, the biofilm accumulation of C. pauculus was the highest and that of S. echinoides was the third-most abundant. The lowest biofilm accumulations were identified in Microbacterium testaceum and M. aquaticum. Most isolates with high adhesion ability also exhibited high biofilm formation ability. Analysis of adhesion and biofilm formation of the isolates from DUWLs can provide useful information to understand the mechanism of DUWL biofilm formation and development.
Keywords
Bacterial adhesion; Biofilms; Dental infection control; Water microbiology;
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