Microbial contamination in dental unit waterlines
Braz. dent. j
;
14(1): 55-57, June 2003. tab
Article
Dans Anglais
| LILACS
| ID: lil-340490
RESUMO
The quality of water in a dental unit is of considerable importance because patients and dental staff are regularly exposed to water and aerosol generated from the dental unit. The aim of this study was to evaluate the occurrence of microbial contamination in dental unit waterlines. Water samples were collected aseptically from the waterlines (reservoir, triple-syringe, high-speed) of 15 dental units. After serial dilution to 110(6) in APHA, the samples were seeded by the pour-plate technique and cultured in plate count agar (Difco) for 48 h at 32ºC. Analysis was based on the number of colony forming units (CFU). The Wilcoxon non-parametric test indicated that the levels of water contamination were highest in the triple-syringe (13 of 15) and in the high-speed (11 of 15); both levels were higher than those of the water reservoir. There was no significant statistical difference between the level of contamination in the triple-syringe and the high-speed as determined by the Mann-Whitney test [p(H0) = 40.98 percent; Z = - 0.2281]. Because biofilm forms on solid surfaces constantly bathed by liquid where microorganisms are present, these results indicate that the water in the dental unit may be contaminated by biofilm that forms in these tubules
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Microbiologie de l'eau
/
Contamination de matériel
/
Équipement dentaire
Limites du sujet:
Humains
langue:
Anglais
Texte intégral:
Braz. dent. j
Thème du journal:
Dentisterie
Année:
2003
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Universidade de São Paulo/BR
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