System for disinfecting the water lines of a dental unit

A system for disinfecting the water lines of a dental compressor is provided with first and second unidirectional check valves. Water at a first pressure is normally supplied to the water lines of the dental unit through the first check valve. A reservoir of liquid disinfectant can be pressurized at a second pressure higher than the first pressure by the dental air compressor already equipping the dental unit to supply disinfectant to the water lines of the dental suction unit through the second check valve. Liquid disinfectant is prevented from reaching the water supply line by the first check valve. In the same manner, when the reservoir is not pressurized, the second check valve prevents water from the water supply line from reaching the disinfectant. The reservoir is formed with an upper neck and a bottom, and the disinfecting system is provided with a housing on which an upper stopper fitting into the neck and a lower reservoir bottom support are mounted, whereby for mounting the reservoir on the housing, one successively tilts the reservoir, places the neck on the stopper and slides the reservoir bottom on the support, which sliding movement is facilitated by a rounded edge of the reservoir bottom.
As well known to those of ordinary skill in the art, a bacterial film, called "biofilm" develops in the network of small diameter water lines of a dental chair, which network supplying the handpieces and water/air syringe with water. This biofilm attach to the inner walls of the water lines. After some weeks, this film is visible to the naked eye.
When water flows in the water lines, a great quantity of bacteria detach from the biofilm. These bacteria, in suspension in the water, are projected directly in the mouth of the patient and are present in the aerosols produced by the handpieces. Studies have indicated that water from the handpieces and air/water syringe of a dental unit does not meet with the microbiological standards of public health regarding drinking water. Such concentration of bacteria, even of non-pathogenic bacteria, constitutes a potential problem of infection for immuno-deficient patients.