Backflow prevention and the dental unit.
D017848:Blood-Borne Pathogens; D002487:Centers for Disease Control and Prevention, U.S.; D003748:Dental Equipment / Q000382:microbiology*; D004866:Equipment Contamination / Q000517:prevention & control*; D019552:Infection Control, Dental / Q000379:methods; D014481:United States; D014871:Water Microbiology; D014876:Water Pollution / Q000517:prevention & control*; D014881:Water Supply