Читать книгу Applied Oral Physiology - Robin Wilding - Страница 70

The oral flora is established from birth by organisms which are passed from the mother to the child. Many bacteria in the air and in food also have access to the oral cavity but do not survive. The oral flora is therefore a specific and, in health, a fairly stable bacterial community. There are, even in healthy mouths, huge numbers of microorganisms. Saliva contains 100 million organisms per milliliter, but the gingival sulcus supports 100 billion bacteria per milliliter. This massive population of the gingival sulcus is possible because the oral organisms have adopted a communal existence. They have formed biofilms, in which a variety of species live in a densely packed mass. The oral biofilms depend on the establishment of a symbiotic relationship with their host and a symbiotic relationship between species, in order for their ecosystem to thrive.