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. 2013;42(6):20120353.
doi: 10.1259/dmfr.20120353. Epub 2013 Feb 18.

Antimicrobial efficiency of ethanol and 2-propanol alcohols used on contaminated storage phosphor plates and impact on durability of the plate

A Wenzel  1 , F Kornum, Mr Knudsen, E Frandsen Lau
Affiliations

Antimicrobial efficiency of ethanol and 2-propanol alcohols used on contaminated storage phosphor plates and impact on durability of the plate

A Wenzel et al. Dentomaxillofac Radiol. 2013.

Abstract

Objectives: To assess (1) antimicrobial efficiency of wiping intraoral phosphor plates with alcohol tissues based on ethanol or 2-propanol alcohols after contamination with Candida albicans and Streptococcus oralis, (2) a concept for autodisinfection with ultraviolet light of the transport ramp in a scanner for phosphor plates and (3) the impact of wiping with alcohol tissues on durability of the plate.

Methods: Suspensions of C. albicans and S. oralis were prepared in concentrations of 10(9) and 10(5) organisms per ml, and Digora (Digora(®) Optime Imaging Plate, size 2; Soredex, PalaDEx Group Brenntag Nordic A/S, Hellerup, Denmark) and Vista (VistaScan(®) Imaging Plate PLUS, size 2; Dürr Dental AG, Bietigheim-Bissingen, Germany) plates were contaminated. The plates were wiped with ethanol or 2-propanol disinfectant tissues and imprints obtained on agar. Number of microbial colonies after culturing was recorded. The scanner ramp was contaminated with C. albicans or S. oralis, respectively, the ultraviolet light (UV light) disinfection in the scanner was activated and the number of colonies after culturing was recorded. Plates from each system were sequentially wiped (5-60 times) with ethanol and 2-propanol, exposed and scanned. 48 images from each system were scored blind: 1 = no artefact, 2 = small artefacts and 3 = severe artefacts.

Results: Ethanol eliminated C. albicans and S. oralis in high and low concentrations from both types of plates, whereas 2-propanol did not eliminate all micro-organisms at high concentrations. The UV light eliminated all micro-organisms from the ramp. Ethanol degraded the plates to a larger extent than did 2-propanol. Images from Vista plates showed severe artefacts after wiping with ethanol; those from Digora plates did not.

Conclusions: Ethanol eliminated all micro-organisms but degraded phosphor plates, whereas 2-propanol did not eliminate all micro-organisms and still degraded plates from Vista but not from Digora.

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Figures

Figure 1
Figure 1
Imprint of the plate contaminated with Candida albicans directly on Saboraud agar demonstrating transferability of organisms from plate to agar
Figure 2
Figure 2
Colonies of Streptococcus oralis on Mitis-Salivarius agar cultured after imprint of plate contaminated with a ≈109 organisms per ml concentration and disinfected with 2-propanol
Figure 3
Figure 3
Colonies of Candida albicans on Saboraud agar after contamination of the scanner ramp with ≈109 organisms per ml concentration and sampling with a wet cotton stick demonstrating transferability of micro-organisms from ramp to agar
Figure 4
Figure 4
Digora (Digora® Optime Imaging Plate, size 2; Soredex, PalaDEx Group Brenntag Nordic A/S, Hellerup, Denmark) and Vista (VistaScan® Imaging Plate PLUS, size 2; Dürr Dental AG, Bietigheim-Bissingen, Germany) plate images after the plate was wiped with ethanol or 2-propanol 5, 20, 30, 40, 50 and 60 times each for 10 s
See this image and copyright information in PMC

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