Physical barrier formation on enamel surface

Physical barrier formation on the enamel surface is a physiological and therapeutic process aimed at protecting dental hard tissues from chemical and mechanical degradation (Featherstone, 2000, JADA). This barrier is primarily composed of the acquired pellicle—a thin film of salivary proteins and lipids—and can be augmented by the deposition of minerals like fluorapatite or synthetic materials such as dental sealants (Siqueira et al., 2012, J Dent Res). From a therapeutic perspective, this 'target' represents a functional state rather than a single molecule, where the goal is to decrease enamel solubility and prevent demineralization caused by cariogenic bacteria or dietary acids. Key interventions include the use of fluoride to enhance mineral resistance and the application of remineralizing agents like casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) to restore mineral density (Reynolds, 2008, Aust Dent J). Understanding the kinetics of barrier formation and its permeability is essential for developing effective treatments for dental caries, enamel erosion, and dentinal hypersensitivity (Hannig & Hannig, 2014, J Dent Res).

Other names

Enamel barrier formationAcquired pellicle formationEnamel remineralizationSurface coating of enamelDental enamel protection

The mechanism involves the deposition of minerals or organic films onto the enamel surface to create a protective layer. Fluoride ions promote the formation of fluorapatite, which is more acid-resistant than natural hydroxyapatite (Featherstone, 2000). Other agents, such as CPP-ACP, provide a reservoir of calcium and phosphate to facilitate remineralization, while salivary proteins adsorb to form the acquired pellicle, which acts as a semi-permeable diffusion barrier (Siqueira et al., 2012).