<unk>  from a dental hand piece A<unk>  is an<unk>  that is produced from dental instrument, dental handpieces, three-way syringes, and other high-speed instruments. These<unk> s may remain suspended in the clinical environment.<unk> s can pose risks to the clinician, staff, and other patients. The heavier particles (e.g., >50 µm ) contained within the<unk> s are likely to remain suspended in the air for relatively short period and settle quickly onto surfaces, however, the lighter particles may remain suspended for longer periods and may travel some distance from the source. These smaller particles are capable of becoming deposited in the lungs when inhaled and provide a route of diseases transmission. Different dental instruments produce varying quantities of<unk> , and therefore are likely to pose differing risks of dispersing microbes from the mouth. Air turbine dental handpieces generally produce more<unk> , with electric micromotor handpieces producing less, although this depends on the configuration of water coolant used by the handpiece. alt
Dental aerosol
Respiratory droplet
Dental instrument
Ventilated cigarette
Cigarette
Airborne 
Electronic cigarette
Smoke inhalation