Dentin tubule and mineralized dental surface

The dentin tubule and mineralized dental surface are the primary structural targets for pharmacological and mechanical interventions in restorative dentistry and the treatment of dentin hypersensitivity. Dentin tubules are microscopic, fluid-filled channels that traverse the dentin, providing a pathway between the oral environment and the dental pulp (StatPearls, 2023). According to the hydrodynamic theory, the movement of fluid within these tubules in response to external stimuli triggers pulpal nociceptors, resulting in the characteristic sharp pain of hypersensitivity (Brännström, 1963). Therapeutic strategies focus on either occluding these tubules to prevent fluid movement or using ionic agents to decrease the excitability of the associated nerve fibers (Orchardson & Gillam, 2006). Furthermore, the mineralized surfaces of enamel and dentin, composed primarily of hydroxyapatite, serve as the site for remineralization therapies where fluoride and calcium-based compounds are used to restore structural integrity and reduce permeability (Journal of Conservative Dentistry, 2014). These targets are essential for maintaining dental health and managing pain associated with tooth wear, recession, and decay.

Other names

Dentinal tubulesExposed dentinEnamel mineral surfaceHydroxyapatite surfaceDental substrate

Therapeutic agents act by either physically occluding the dentinal tubules to block fluid movement or by chemically desensitizing the intradental nerves. Tubule occlusion is achieved through the precipitation of minerals, such as calcium phosphates or fluorapatite, or the use of protein precipitants like glutaraldehyde, which effectively halts the hydrodynamic mechanism of pain (Brännström, 1963; Cummins, 2010). Alternatively, agents like potassium nitrate increase the extracellular concentration of potassium ions, leading to a sustained depolarization of the nerve membrane that inhibits the transmission of pain signals (Orchardson & Gillam, 2006). Remineralizing agents further interact with the mineral surface to promote the deposition of acid-resistant crystals, thereby strengthening the tooth structure and reducing sensitivity (Marinho et al., 2003).