Comparison of dental water quality management procedures

Murdoch‐Kinch, Carol Anne; Andrews, N.; Atwan, Salwa; Jude, Rick; Gleason, Michael; Molinari, John A.

doi:10.14219/jada.archive.1997.0400

Cited by 39 publications

(38 citation statements)

References 10 publications

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“…Evidence for biofilms in these systems has come from a number of studies, using both scanning electron microscopy (143,173,213) and viable plating of organisms isolated from the dental unit components (199). Whitehouse et al (213) observed a variety of bacteria embedded in an apparent polysaccharide matrix.…”

Section: Dental Unit Water Linesmentioning

confidence: 99%

“…When chlorination was discontinued, the counts continued to increase. However, MurdochKinch et al (143) found that chlorination (1:10 bleach) of systems already contaminated with biofilms was ineffective in removing them. The problem may lie in the fact that dental unit water lines are very small in diameter, present a very high surface-tovolume ratio and relatively low flow rates, and are ideal for colonization with aquatic bacteria, leading to biofilm formation.…”

Section: Dental Unit Water Linesmentioning

confidence: 99%

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Biofilms: Survival Mechanisms of Clinically Relevant Microorganisms

2002

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Though biofilms were first described by Antonie van Leeuwenhoek, the theory describing the biofilm process was not developed until 1978. We now understand that biofilms are universal, occurring in aquatic and industrial water systems as well as a large number of environments and medical devices relevant for public health. Using tools such as the scanning electron microscope and, more recently, the confocal laser scanning microscope, biofilm researchers now understand that biofilms are not unstructured, homogeneous deposits of cells and accumulated slime, but complex communities of surface-associated cells enclosed in a polymer matrix containing open water channels. Further studies have shown that the biofilm phenotype can be described in terms of the genes expressed by biofilm-associated cells. Microorganisms growing in a biofilm are highly resistant to antimicrobial agents by one or more mechanisms. Biofilm-associated microorganisms have been shown to be associated with several human diseases, such as native valve endocarditis and cystic fibrosis, and to colonize a wide variety of medical devices. Though epidemiologic evidence points to biofilms as a source of several infectious diseases, the exact mechanisms by which biofilm-associated microorganisms elicit disease are poorly understood. Detachment of cells or cell aggregates, production of endotoxin, increased resistance to the host immune system, and provision of a niche for the generation of resistant organisms are all biofilm processes which could initiate the disease process. Effective strategies to prevent or control biofilms on medical devices must take into consideration the unique and tenacious nature of biofilms. Current intervention strategies are designed to prevent initial device colonization, minimize microbial cell attachment to the device, penetrate the biofilm matrix and kill the associated cells, or remove the device from the patient. In the future, treatments may be based on inhibition of genes involved in cell attachment and biofilm formation

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Section: Dental Unit Water Linesmentioning

confidence: 99%

Section: Dental Unit Water Linesmentioning

confidence: 99%

Biofilms: Survival Mechanisms of Clinically Relevant Microorganisms

2002

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“…To overcome these problems the use of independent water systems and microfilters has been suggested. 10,26,27,32 It was also advised that a strict maintenance regime, consisting of daily flushing and purging with sodium hypochlorite be followed. The use of special in-office DUWL monitoring technology has also been prescribed.…”

Section: Research Cross Infectionmentioning

confidence: 99%

Electro-chemically activated water in dental unit water lines

Marais¹,

Brözel²

1999

Br Dent J

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“…The fi rst researcher to report the microbial contamination of DUWL output water was Blake in 1963 (1). This was followed by numerous studies describing both mechanical (rinsing, fi ltration) and chemical (sodium hypochlorite, chlorhexidine gluconate, hydrogen peroxide) elimination of microorganisms or biofi lm in DUWL water (2,3,4,5). It was also pointed out that the use of selected biocides (sodium hypochlorite, glutaraldehyde, isopropanol) may lead to the accumulation of these substances in biofi lm matrix and their uncontrolled release.…”

Section: Introductionmentioning

confidence: 99%

Legionella spp. in dental unit waterlines

Jurásková¹,

Sedlackova²,

Janska³

et al. 2017

BLL

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OBJECTIVE: To determine the current presence of Legionella spp. in the output water of dental unit waterlines (DUWLs) and examine its mitigation by disinfection at the Institute of Dentistry and Oral Sciences, Faculty of Medicine and Dentistry, Palacky University Olomouc and University Hospital Olomouc. MATERIAL AND METHODS: The fi rst stage of our survey involved collecting samples of DUWL output water from 50 dental chair units (DCUs), and 2 samples of the incoming potable water. In October 2015, a one-time disinfection (1 % Stabimed) of DUWLs was conducted. This was followed by collecting 10 control samples (survey stage 2). RESULTS: From the total of 50 samples (survey stage 1), 18 samples (36.0 %) tested positive for Legionella spp. Following the disinfection, nine of the ten samples no longer showed any presence of Legionella. CONCLUSION: Based on culture results, the one-time disinfection (1 % Stabimed) was effective. We are unable to comment on the duration of positive effect of disinfection on the occurrence of Legionella spp. in the outlet water. It was a one-time survey (Tab. 2, Ref. 32). Text in PDF www.elis.sk. KEY WORDS: Legionella spp., water of dental unit waterlines, disinfection.

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Comparison of dental water quality management procedures

Cited by 39 publications

References 10 publications

Biofilms: Survival Mechanisms of Clinically Relevant Microorganisms

Biofilms: Survival Mechanisms of Clinically Relevant Microorganisms

Electro-chemically activated water in dental unit water lines

Legionella spp. in dental unit waterlines

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