Biofilms are slimey deposits usually of the bacterial type which accumulate in a moist environment to surfaces and grow. The appearance of biofilms is often compared with algae/mold deposits (e. g. moldy deposits in tile joints, water tanks, hoses etc.).
Each day a mixture of water and secretion (including saliva, blood, amalgam, tooth particles etc.) runs through the suction lines of a dental unit and partially remains there, even directly at the entry to the dental suction system. This causes a rapid increase of germs in the suction lines. As a result, biofilms can form supported by dirt and bacteria residues. Consequently, there is a colonization of various bacteria, fungi and development of a bio layer – the so-called biofilm.
Microorganisms (bacteria, fungi etc.) colonize on surfaces of moist environment (such as suction lines of dental suction systems or service water lines of dental units as mentioned above). The large surfaces of pipe or tube systems offer a perfect environment for a rapid increase of germs (formation of biofilm). Particularly during treatment breaks (stagnation) the brackish water stagnates in the lines (suction and service water ways) and causes an increase of temperature of up to more than 37°C.