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Göteborgs universitets publikationer

Regelbunden rengöring av unitar

Författare och institution:
Åke J. R. Möller (Institutionen för odontologi); Gunnar Dahlén (Institutionen för odontologi)
Publicerad i:
Tandläkartidningen, 99 ( 11 ) s. 52-56
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
Cleaning and disinfection of dental units´ water systems according to the UnitClean-method ÅJR Möller and G Dahlén, Tandläkartidningen 2007;99 (no 11):52-56. The complex water system of dental units is colonized by bacteria from the tap water. This is a consequence of the fact that the water system of the units contains plastic tubes and valves with several retention sites in combination with a low water flow. A biofilm containing complex organic material develops and creates the conditions for an increased bacterial content in the unit water. The thickness of the biofilm increases with time and it may attract pathogenic bacteria, e.g. Legionella pneumophila, Pseudomonas spp, E. coli, etc. Technical disturbances, e.g. turbine damage, may also follow. The present investigation confirms the high number of bacteria in many unit water systems. A method for cleaning and disinfection, named UnitClean, has been studied on 42 heavily colonized dental units during a period of 6 months. A gradually decrease of bacteria was noted in the water of the units. When the biofilm was absent, indicated by very few bacteria, recolonisation occurred slowly and repeated cleaning was not necessary until monthly. The latest result of 102 units, treated according to given instructions was followed up. No or only a few cfu of fast growing bacteria were seen. Further , 88 - 95 % of the water lines from de four instruments of these units produced water containing <100 cfu / ml of slow growing bacteria. Only in a few cases a single water line showed different result compared with the other at the same unit at the same sampling occasion. This shows that after a initial controlled cleaning period with desired result, further random control from only one instrument on the unit seems to be necessary
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Klinisk medicin ->
Odontologi ->
Oral mikrobiologi
microbial colonisation, dental unit, biofilm, cleaning, desinfection
Postens nummer:
Posten skapad:
2008-05-21 16:43
Posten ändrad:
2010-01-26 12:48

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