Oral microbial membranes and biofilm matrix

The oral microbial membrane and biofilm matrix constitute a complex structural and functional target essential for the persistence of dental plaque and the development of oral diseases. The microbial membranes of diverse bacterial species provide a physical barrier and a platform for metabolic processes, while the surrounding biofilm matrix, or extracellular polymeric substances (EPS), acts as a protective scaffold. This matrix is composed of polysaccharides, proteins, and extracellular DNA, which facilitate bacterial adhesion and shield the community from antimicrobial agents and host immune defenses (Flemming et al., 2010, Nature Reviews Microbiology). In conditions like dental caries and periodontitis, the biofilm matrix promotes the sequestration of acids or toxins, leading to localized tissue destruction (Bowden & Hamilton, 1998, Advances in Dental Research). Therapeutic agents such as chlorhexidine and cetylpyridinium chloride target the negatively charged microbial membranes to induce cell lysis and death (Jones, 1997, Periodontology 2000). Other strategies involve the use of enzymes or surfactants to degrade the EPS, thereby increasing the penetration of antimicrobial drugs into the deeper layers of the biofilm and facilitating mechanical removal (Koo et al., 2017, Nature Reviews Microbiology). Effective management of this target is fundamental to controlling oral infections and preventing systemic complications associated with chronic periodontal inflammation.

Other names

Dental plaqueOral biofilmExtracellular polymeric substances (EPS)Microbial cell envelopeDental biofilm matrix

Antimicrobial agents target this complex through several pathways: cationic antiseptics like chlorhexidine bind to negatively charged cell wall components and membranes, causing cytoplasmic leakage (StatPearls, 2023); oxidizing agents like hydrogen peroxide induce non-specific damage to membrane lipids and proteins; and matrix-disrupting agents like delmopinol inhibit the synthesis of extracellular polysaccharides or degrade the EPS scaffold to enhance drug penetration and reduce bacterial adhesion (Marsh, 2010, Journal of Dental Research).