Physiological dentinal structures

Physiological dentinal structures refer to the mineralized connective tissue that forms the bulk of the tooth, situated between the dental pulp and the outer enamel or cementum (StatPearls, 2023). This tissue is characterized by a complex architecture of dentinal tubules—microscopic channels that radiate from the pulp to the dentinoenamel junction—containing odontoblastic processes and interstitial fluid (PubMed, 2021). Dentin serves a primary biological function of providing structural support to the brittle enamel and acting as a protective barrier for the vital pulp tissue (NIH, 2022). It is composed of approximately 70% inorganic hydroxyapatite, 20% organic collagenous matrix, and 10% water (StatPearls, 2023). In clinical pharmacology, dentin is not a single molecular receptor but a therapeutic substrate for agents like fluoride, which promotes remineralization, and potassium nitrate, which reduces nerve excitability in cases of hypersensitivity (PubMed, 2020). Damage to these structures, often through acid erosion or bacterial action, results in dental caries or dentin hypersensitivity, necessitating restorative or desensitizing treatments. The integrity of the dentinal structure is also crucial for the success of adhesive dentistry, where resin monomers must infiltrate the collagen network to form a hybrid layer (PubMed, 2019). Therapeutic challenges include managing the permeability of the tubules to prevent pulpal irritation from external chemicals or bacteria.

Other names

DentinDentinumDental matrixDentinal tubule systemCircumpulpal dentin

Drugs targeting dentinal structures typically work through tubule occlusion to reduce sensitivity, remineralization of the hydroxyapatite matrix to restore mineral density, or the induction of reparative dentin formation by stimulating underlying odontoblasts.