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

Lida Toomarian, Sahand Rikhtegaran, Mehrnoosh Sadighi, Siavash Savadi Oskoee & Parnian Alizadeh Oskoee
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...