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J Dent Res Dent Clin Dent Prospects. 2007;1(1): 43-47.
  Abstract View: 660
  PDF Download: 572

Original Article

Contamination of Dental Unit Water and Air Outlets Following Use of Clean Head System and Conventional Handpieces

Lida Toomarian 1, Sahand Rikhtegaran 2, Mehrnoosh Sadighi 3*, Siavash Savadi Oskoee 4, Parnian Alizadeh Oskoee 5

1 Associate Professor, Department of Pediatric Dentistry, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran,Iran.
2 Post-graduate Student, Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Iran
3 Dentist, Department of Pediatric Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Iran.
4 Associate Professor, Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Iran.
5 Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Iran.
*Corresponding Author: *Corresponding author: , Email: mehrnoosh1378@yahoo.com

Abstract

Background and aims. Dental handpiece is a source of contamination because it is in constant touch with the oral cavity. Sterilization does not seem to be sufficient to prevent penetration of microorganisms into air and water lines of the unit, because negative pressure developed by valves (which are placed in water outlets) and post shut-off inertial rotation of handpiece result in water and debris being sucked into air and water outlets of dental unit. The aim of this study was to compare dental unit contamination following use of clean head system handpieces and conventional handpieces.

Materials and methods. Twenty-two dental units in the Department of Pediatric Dentistry in Shahid Beheshti Faculty of Dentistry were used for the purpose of this study. A 1.5×108 cfu/mm3 concentration of Staphylococcus epidermis (SE) was used to contaminate the air and water outlets of dental units. Ten clean head system handpieces and 10 conventional handpieces were used for 30 seconds in the abovementioned suspension. Microbial samples were collected from the air and water lines. Culturing and colony counting procedures were carried out. Data was analyzed by t-test; a value of p<0.01 was considered significant.

Results. Results demonstrated a significantly lower SE contamination in water outlets following the use of clean head system (p<0.01).

Conclusion. A lower tendency of clean head system handpieces to transmit SE compared to conventional system makes them a better choice for infection control.

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Submitted: 07 Nov 2006
Accepted: 27 Jan 2007
ePublished: 03 Jul 2017
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