LESSON 9

Prof. E. O. Kravtsova

(allochthonous) - come from the environment.
Conditions for present of microorganisms

in the oral cavity are: - the presence of food - the optimum temperature (36-37 C) - the moisture - neutral pH - anatomical features that promote the accumulation of microbial cells.

be divided into several biotopes:
Dental plaque.
Oral mucous membrane.
Gum mucous membrane

and gingival groove zone.
Oral fluid.
Tongue surface.
 

first attach to the surface of the mucous membrane or

to the teeth.
Adhesion is necessary to ensure the resistance to the saliva and colonization.

which is formed on the surface of the tooth.
Up

to 90% of the oral cavity’s microflora is concentrated in the dental plaque.
Streptococci, Actinomyces and Lactobacilli prevail.
Such individual characteristics of the organism as a diet, lifestyle, occupational hazards, and immune system play a role in the formation of the plaque microflora.

is the biotope with an extensive area. The microflora differs

significantly in various parts of it.
The facultative-anaerobic flora predominates on the surface of the mucous membrane (S.sanguis).
Anaerobic species (Veillonella, Peptostreptococci, Lactobacilli, and Streptococci - S.mitis) usually predominate in the sublingual area, on the inner surface of the cheeks, in the folds and crypts of the oral cavity’s mucous membrane.
Streptococci, Corynebacteria, Neisseria, yeast-like fungi and Nocardia are found in large numbers on the mucous membrane.

activity.
S. salivarius, Veillonella, Neisseria, Spirochetes – are present here.

mouth: