Contamination of the turbine air chamber: a risk of cross infection
- 1 August 1998
- journal article
- Published by Wiley in Journal of Clinical Periodontology
- Vol. 25 (8), 607-611
- https://doi.org/10.1111/j.1600-051x.1998.tb02495.x
Abstract
In the present work, we evaluated (a) the influx of contaminating fluid into the air chamber when a high‐speed turbine stops rotating, (b) the significance of a series of variables (type of handpiece and dental unit, shape of the bur, number of stops set on the turbine) which condition it, and (c) the time required to expell the contaminating fluid from the turbine head. Results showed that contamination takes place every time the turbine stops rotating with the bur in contact with an external fluid. The main variable affecting the influx of contaminating fluid into the air chamber of the turbine head was represented by the shape of the bur (F=54.9; pF=7.3; p=0.01). The number of stops set on the turbine was irrelevant (F=0.03; p=n.s.). The expulsion of the contaminant from the turbine head showed 2 different exponential rates: a very rapid‐elimination phase within 30 s and a slow‐elimination phase between 60 and 300 s. In order to remove over 99%, of the contaminant from the air chamber, a turbine had to run for more than 4–7 min depending on the type of the handpiece. In conclusion, data from the present study suggest that a significant cross‐infection potential exists with high‐speed handpieces whenever they are only externally scrubbed and disinfected so the internal cleaning and sterilization between patients is mandatory. The practice of flushing by running the turbines between patients should be discouraged.Keywords
This publication has 15 references indexed in Scilit:
- Prevention of microbial contamination of the dental unit caused by suction into the turbine drive air linesOral Surgery Oral Medicine Oral Pathology Oral Radiology and Endodontology, 1996
- Detection of hepatitis C virus‐RNA by polymerase chain reaction in dental surgeriesJournal of Medical Virology, 1995
- The microbiological quality of water in dental chair unitsJournal of Hospital Infection, 1993
- Cross-contamination potential with dental equipmentThe Lancet, 1992
- Risk of HIV transmission during dental treatmentThe Lancet, 1992
- The significance of the bacterial contamination of dental unit water systemsBritish Dental Journal, 1987
- Bacterial contamination of dental handpiecesJournal of Dentistry, 1980
- The Slow-Growing Pigmented Water Bacteria: Problems and SourcesAdvances in applied microbiology, 1978
- Hepatitis B Virus Infection in DentistsNew England Journal of Medicine, 1975
- Studies on Dental Aerobiology: IV. Bacterial Contamination of Water Delivered by Dental UnitsJournal of Dental Research, 1971