Dentin mineral surface and dentinal tubules

Dentin is a calcified tissue that forms the bulk of the tooth, consisting of a mineralized hydroxyapatite matrix and a network of microscopic channels known as dentinal tubules (StatPearls: Dentin Hypersensitivity, 2023). These tubules extend from the dental pulp to the enamel or cementum, housing odontoblastic processes and fluid that transmit external stimuli to the pulpal nerves (PubMed: PMID 12673913). When the dentin mineral surface is exposed due to enamel loss or gingival recession, fluid movement within the tubules triggers pain, a condition known as dentin hypersensitivity (Journal of Dentistry, 2013). This structure is a primary therapeutic target for desensitizing agents, which aim to either occlude the tubule orifices or reduce nerve excitability (NIH: Dental Caries, 2022). Modern treatments utilize bioactive glasses, fluoride compounds, and arginine-calcium carbonate complexes to promote remineralization and restore the protective barrier of the dentin surface (PubMed: PMID 30132344).

Other names

Dentinal tubulesDentin surfaceCalcified dentin matrixDentin-pulp complex

The primary mechanisms involve the physical occlusion of dentinal tubules to prevent fluid movement (hydrodynamic theory) and the chemical desensitization of pulpal nerve fibers using potassium ions to inhibit repolarization (StatPearls: Dentin Hypersensitivity, 2023).