Dentin mineral and dentinal tubules

Dentin is a mineralized connective tissue that constitutes the bulk of the tooth, consisting of an inorganic hydroxyapatite matrix and an organic collagenous framework (StatPearls, 2023). It is characterized by the presence of dentinal tubules, which are microscopic channels that radiate from the dental pulp to the enamel or cementum junction (PubMed, PMID: 12671075). These tubules are central to the hydrodynamic theory of dentin hypersensitivity, as they allow for fluid movement that stimulates pulpal nerve fibers in response to external stimuli (Brännström, 1963). Consequently, dentin mineral and tubules are the primary therapeutic targets for desensitizing agents and remineralizing treatments. Therapeutic interventions typically aim to either occlude the tubule openings to block fluid flow or alter the excitability of the intradental nerves (Cummins, 2009). Common agents include fluoride compounds, which promote mineral precipitation, and potassium salts, which reduce nerve sensitivity by increasing extracellular potassium concentration (Markowitz & Kim, 1990). Additionally, silver diamine fluoride is used to arrest caries by reacting with the dentin mineral to form protective layers of silver phosphate and calcium fluoride (Horst et al., 2016). Understanding the structural integrity and permeability of dentin is crucial for developing effective dental materials and treatments for pain management and restorative care.

Other names

Dentinal canaliculiDental mineral matrixHydroxyapatite-collagen complexDentin-pulp complex

Therapeutic agents target this structure through two primary mechanisms: physical occlusion of the dentinal tubules to block fluid movement (hydrodynamic theory) and chemical desensitization of intradental nerves using potassium ions to inhibit repolarization (StatPearls, 2023; Cummins, 2009).