What Is Dental Biofilm?

Dental plaque biofilm is a bacterial biofilm that is a matrix-wrapped soft, non-mineralized bacterial population that adheres to each other, or adheres to the tooth surface, between teeth, or on the surface of a restoration, and cannot be washed away by water or Rinse.

Plaque biofilm

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Dental plaque biofilm ^[1] can accommodate a wide variety of bacterial genera. The layered structure contains aerobic bacteria, facultative anaerobic bacteria and absolute anaerobic bacteria with different oxygen sensitivity. These bacteria are embedded in a matrix rich in polysaccharides, proteins, peptides and minerals. Dental plaque biofilm is the foundation on which the flora depends, and its role can be summarized as:

1. Inhibit the metabolic activity of bacteria and protect the plaque flora from the harsh environment of the mouth, so that the bacteria can survive under some unsuitable living conditions.

2. The polymer matrix contained in the biofilm acts as a restrictive network, which can maintain the integrity of the plaque structure and maintain the channels in the membrane to ingest and store food and control the movement speed of matrix components.

3. The high level of sulfhydryl in the plaque biofilm can neutralize oxygen and resist oxidative damage, so that the oxygen flow diffused and penetrated from the plaque surface does not cause most bacterial cells to be oxidized.

4. Concentrate nutrients and other elements from the environment, and retain some dissolved substances that are missing from the bacterial cells.

5. Express new genes, depress certain genes and give bacteria a new phenotype.

6. Protect microorganisms from antibacterial drugs. The resistance of bacteria in the biofilm to antibiotics is about 1,000 times that of the same type of plankton.