Dental pulp sensory nerve fibers

Sensory nerve fibers in the dentin and pulp are specialized trigeminal afferent neurons that mediate the sensation of dental pain. These fibers are categorized into myelinated A-delta fibers, which respond to hydrodynamic stimuli in dentin with sharp, localized pain, and unmyelinated C fibers, which respond to inflammatory mediators in the pulp with dull, aching pain [1][2]. The unique environment of the tooth means that almost all stimuli—thermal, mechanical, or chemical—are perceived as pain due to the high density of nociceptors [2]. Key molecular components of these fibers include voltage-gated sodium channels (Nav1.7, Nav1.8) and transient receptor potential (TRP) channels like TRPV1 and TRPA1, which serve as the primary transducers of noxious stimuli [3]. Pharmacological targeting of these fibers is a cornerstone of dentistry, primarily through the use of local anesthetics that block sodium channels to prevent pain signaling during procedures [1]. Additionally, topical agents like eugenol are used to desensitize these nerve endings in cases of pulpitis [3]. Understanding the physiology of these fibers is crucial for managing conditions like dentinal hypersensitivity and acute pulpitis [2].

Other names

Pulpal nociceptorsIntradental sensory nervesDentin-pulp complex nervesTrigeminal afferent fibers in dental pulp

Inhibition of voltage-gated sodium channels (Nav1.7, Nav1.8) to prevent action potential propagation [1]; desensitization of transient receptor potential (TRP) channels such as TRPV1 and TRPA1 [3]; modulation of neurotransmitter release (e.g., CGRP, Substance P) from nerve terminals [2].