Tooth surface hydroxyapatite, acquired pellicle, and biofilm matrix

The tooth surface hydroxyapatite, acquired pellicle, and biofilm matrix represent a multi-layered biological interface essential for maintaining oral homeostasis. Hydroxyapatite is the crystalline calcium phosphate mineral that forms the bulk of tooth enamel and dentin, serving as the primary structural component (StatPearls, 2023 [https://www.ncbi.nlm.nih.gov/books/NBK542213/]). The acquired pellicle is a thin, acellular film of salivary proteins and glycoproteins that forms immediately upon the enamel surface, acting as both a protective lubricant and a substrate for microbial attachment (Journal of Dental Research, 2020 [https://doi.org/10.1177/0022034520907342]). The biofilm matrix is a complex extracellular polymeric substance (EPS) produced by resident oral microflora, which protects bacteria from environmental stressors and facilitates the localized acid production that leads to demineralization (Nature Reviews Microbiology, 2016 [https://doi.org/10.1038/nrmicro.2016.54]). This complex is the primary target for caries-preventive agents like fluoride, which integrates into the mineral lattice, and anti-plaque agents that disrupt the biofilm's structural integrity (PubMed, 2019 [https://pubmed.ncbi.nlm.nih.gov/31145533/]). Understanding the interaction between these components is vital for developing therapies that prevent dental decay and periodontal disease while maintaining a healthy oral microbiome.

Other names

Dental plaqueDental biofilmSalivary pellicleEnamel hydroxyapatiteExtracellular polymeric substance (EPS) matrixDental Biofilm-Pellicle-Enamel Interface

The target is modulated through several mechanisms: fluoride ions substitute hydroxyl groups in hydroxyapatite to form acid-resistant fluorapatite; antimicrobial agents like chlorhexidine bind to the pellicle and biofilm matrix to disrupt bacterial membranes and inhibit adhesion; and remineralizing agents provide a reservoir of calcium and phosphate ions within the biofilm matrix to reverse early enamel demineralization.