Divalent and trivalent metal cations in dental biofilm

Divalent and trivalent metal cations, such as calcium (Ca2+), magnesium (Mg2+), zinc (Zn2+), and iron (Fe3+), are essential chemical constituents of the dental biofilm environment that dictate the structural stability and metabolic activity of oral microbial communities. These multivalent ions act as cross-linking agents within the extracellular polymeric substance (EPS) matrix, forming ionic bridges that stabilize the biofilm architecture and promote bacterial adhesion to the tooth surface (Rose, 2000; Bowen, 2002). The concentration of these cations, particularly calcium, is a primary determinant of the demineralization-remineralization equilibrium; a depletion of these ions in the plaque fluid often leads to the dissolution of enamel hydroxyapatite and the development of dental caries (Cochrane et al., 2010). Therapeutically, metal cations like stannous (Sn2+) and zinc (Zn2+) are incorporated into dentifrices to exert antimicrobial effects by disrupting bacterial membrane integrity and inhibiting glycolytic enzymes (Lynch, 2011). Conversely, chelating agents may be used to sequester these ions, thereby destabilizing the biofilm matrix for more effective removal (Marsh, 2006). Understanding the dynamics of these cations is crucial for developing targeted therapies that can modulate the oral environment to favor health over disease.

Other names

Dental plaque metal ionsBiofilm cationsMultivalent metal ions in oral biofilmSalivary electrolytes

Promotion of enamel remineralization, inhibition of bacterial enzymes, disruption of biofilm matrix via chelation, and competitive binding to bacterial cell walls.