Dentin tubules and pulpal nerves

Dentin tubules are microscopic channels that span the dentin layer of the tooth, housing dentinal fluid and odontoblast processes (StatPearls, 2023). These structures are in close proximity to pulpal nerve endings, specifically A-delta and C-fibers, which transmit pain signals in response to external stimuli (PubMed, 2021). According to the hydrodynamic theory, the movement of fluid within these tubules triggers the pulpal nerves, leading to dentin hypersensitivity (Brännström, 1963). This anatomical complex is the primary focus of treatments for dental pain and sensitivity. Pharmacological interventions typically involve either the physical occlusion of the tubules or the chemical desensitization of the nerves (Journal of Clinical Dentistry, 2009). Occluding agents like strontium or arginine create a barrier to fluid movement, while potassium salts act directly on nerve membranes to inhibit repolarization (NIH, 2022). Understanding the interaction between the tubules and the nerves is essential for the development of desensitizing toothpastes and professional dental treatments.

Other names

Dentinal tubulesDental pulp nervesOdontoblast-nerve complexA-delta and C-fibers

Therapeutic agents work via two main pathways: physical occlusion of the dentin tubules to block fluid movement (hydrodynamic theory) or chemical desensitization of pulpal nerves by increasing extracellular potassium concentration to prevent nerve firing.