Exposed dentin surface and dentinal tubule lumens

Exposed dentin surface and dentinal tubule lumens represent a structural and physiological target in the management of dentin hypersensitivity rather than a specific molecular receptor or enzyme. Dentin is a mineralized tissue containing thousands of microscopic channels, or tubules, that connect the outer tooth surface to the dental pulp (StatPearls, 2023). When protective enamel or cementum is lost, these tubules become patent, allowing external thermal, osmotic, or tactile stimuli to induce fluid flow within the tubules. According to the hydrodynamic theory, this fluid movement activates mechanoreceptors in the pulp, resulting in sharp, transient pain (Journal of Conservative Dentistry, 2014). Pharmacological and dental interventions aim to either physically seal these tubule orifices using agents like bioactive glass (NovaMin) and arginine-calcium carbonate or to reduce nerve excitability using potassium salts (PMID: 19489189; PMID: 20455343). While highly effective for symptom management, this target is considered 'incorrect' in a strictly biochemical context as it is a complex tissue structure rather than a single protein or gene product.

Other names

Exposed dentinDentinal tubulesPatent dentinal tubulesDentin surfaceDentin-pulp complex

Therapeutic agents target this site through physical occlusion of the tubule lumens to block fluid movement or through chemical desensitization of intradental nerves by increasing extracellular potassium ion concentration (StatPearls, 2023; PMID: 23550501).