THE COMPLEX STRUCTURE OF DENTAL PLAQUE BIOFILMS

1. The structure of plaque Biofilm development

A. 1-St stage-film coating

1. In several minutes after cleaning the surface of the tooth, the film forms on the surface of the tooth. This film, acquired film, consisting of various salivary glycoproteins (mucins) and antibodies.

a. The purpose acquired film protects the enamel with sour activities.

B. Unfortunately, in addition to providing protection from acids, purchased the film also changes the charge and energy on the surface of the tooth, promoting bacterial.

c. A useful analogy in understanding the role of the acquired film in plaque biofilm formation is seen as film "double-sided adhesive tape." Double-sided tape sticks to the surface of the tooth on the one hand, and provides a sticky surface on the other hand, which facilitates their installation using bacteria to the tooth surface.

B. stage 2-initial investment bacteria, film

1. Within a few hours after the film education, bacteria begin to attach to the outer surface of a film.

2. Some bacteria have the attachment structures such as extracellular substances, and hundreds of stiff hair-like structures that enable them to quickly attach in contact with the surface of the tooth. In the hair-like structures called fimbriae.

C. step 3-new bacteria to join. Once bacteria to adhere to the tooth, they begin to produce substances that stimulate other free floating bacteria to join the community.

D. stage 4-cell-free layer of mucus and formation Microcolony

1. The production of extracellular layer of mucus.

a. It seems that the act of accession to the tooth surface, stimulates the bacteria produce slimy, gluelike intercellular substance called a layer of mucus.

B. It extracellular layer of mucus helps to anchor the bacteria to the tooth surface and protects the supplied bacteria.

2. Microcolony formation

a. After tooth surface is covered with attached bacteria biofilms, growing, primarily by cell division occurring bacteria (and not through the attachment of new bacteria).

B. Next, breeding bacteria begin to grow away from the tooth.

c. Bacterial bloom periods, when for certain species or groups of species quickly to grow rapidly. E. step 5-Mature Biofilm: mushroom Microcolonies

1. Bacteria cluster together to form a mushroom microcolonies that are attached to the tooth surface on a narrow base.

2. As a result of formation of complex collections of different bacteria are related to each other...