Dentin nerve endings

Dentin nerve endings are free sensory nerve terminals, primarily A-delta and C fibers, that extend from the subodontoblastic plexus (plexus of Raschkow) into dentinal tubules, often running parallel to odontoblast processes without synaptic connections.[1][5][7] They are most dense in pulp horns and decrease toward root dentin, detecting stimuli through hydrodynamic theory where dentinal tubule fluid shifts activate mechanosensitive channels like Piezo2 or TRP channels (TRPV1, TRPA1).[1][2][5] These endings transmit sharp pricking pain (A-delta) or burning aching sensations (C-fibers), contributing to dentin hypersensitivity when enamel wears thin, exposing tubules to thermal, osmotic, or evaporative triggers.[3][4][13] In disease, they play roles in pulp inflammation and injury responses, potentially modulated by neuropeptides like NGF from fibroblasts.[1][5] While not a molecular therapeutic target like receptors or enzymes, their activity underlies conditions treated indirectly via desensitizers (e.g., tubule occluders) or pulp capping, with no direct drugs targeting them.[3][4] The canonical name "Dentin nerve endings" refers to anatomical structures rather than a specific protein, receptor, or druggable molecule, making it unsuitable as a therapeutic target in standard biotech/drug discovery contexts.[1][5] They arise from trigeminal afferents, with molecular markers including S100b, Calca, Piezo2 for many, and TRP channels in subsets, but lack targeted pharmacology.[5][6] Research focuses on their role in pain mechanisms, not as manipulable entities for systemic therapies.[4][13]

Other names

Intratubular nerve fibersDentinal nerve fibersFree nerve endings in dentinSubodontoblastic nerve plexus terminals