Bacterial cell membrane and oral biofilm matrix

The bacterial cell membrane and oral biofilm matrix are fundamental structural components that facilitate the survival and pathogenicity of oral bacteria. The cell membrane serves as a vital semi-permeable barrier, maintaining ion gradients and protecting the cytoplasm; its disruption by surfactants or cationic agents leads to rapid bacterial lysis [1]. The oral biofilm matrix, or extracellular polymeric substances (EPS), consists of a complex network of polysaccharides, proteins, and DNA that anchors bacteria to tooth surfaces and provides a protective microenvironment [2]. This matrix acts as a physical shield against the host immune system and limits the diffusion of therapeutic agents, contributing to the high antibiotic tolerance of dental plaque [3]. Targeting these structures is a cornerstone of oral hygiene, utilizing agents that either compromise membrane integrity or enzymatically dissolve the matrix scaffold [4]. Such interventions are essential for preventing and treating biofilm-mediated diseases, including dental caries and periodontitis [5]. By destabilizing the physical architecture of the biofilm, these treatments allow for more effective mechanical removal of plaque and better penetration of other antimicrobial agents [6]. However, the non-specific nature of these targets can sometimes lead to the disruption of beneficial commensal bacteria within the oral cavity [7].

Other names

Dental plaque matrixExtracellular Polymeric SubstancesEPSBacterial cytoplasmic membraneOral biofilm scaffold

Antimicrobials like chlorhexidine bind to the negatively charged bacterial cell membrane, causing leakage of low molecular weight components and eventual precipitation of cytoplasmic contents [1]. Matrix-targeting agents, such as enzymes or chelators, degrade the extracellular polymeric substances (EPS), thereby reducing the structural integrity of the biofilm and facilitating the removal of dental plaque [2].