Dental Biofilm Definition — NDEB AFK MCQ
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Correct answer: E — A structured community of microorganisms enclosed in a self-produced extracellular polymeric substance (EPS) matrix adhered to a surface
A dental biofilm (plaque) is a highly organised, three-dimensional community of diverse microorganisms encased in a self-produced extracellular polymeric substance (EPS) matrix composed of polysaccharides, proteins, nucleic acids, and lipids. The EPS matrix provides structural integrity, nutrient channels, protection from antimicrobials, and an environment for cell-cell communication (quorum sensing). Biofilm bacteria are physiologically distinct from planktonic (free-floating) bacteria and are up to 1000× more resistant to antimicrobials. This is why mechanical disruption (brushing, flossing, scaling) is essential.
Reference: Lamont – Oral Microbiology and Immunology, 3rd ed., 2019