Dental pulp nerve fibers

Dental pulp nerve fibers are the sensory axons that provide innervation to the dental pulp, primarily arising from the trigeminal nerve. These fibers are categorized into myelinated A-delta fibers, responsible for sharp, immediate pain, and unmyelinated C-fibers, which mediate slow, dull, and aching pain typically associated with tissue injury (Hargreaves & Berman, 2015). Their primary biological role is nociception, serving as a sensory alarm system for the tooth against thermal, mechanical, or bacterial insults. In conditions like pulpitis, inflammatory mediators sensitize these fibers, leading to hyperalgesia and allodynia through the modulation of ion channels such as Nav1.7 and TRPV1 (Byers et al., 2003). Clinically, these fibers are the functional targets for local anesthetics, which interrupt signal transmission by blocking voltage-gated sodium channels. Understanding the neurobiology of these fibers is essential for effective pain management in endodontics and restorative dentistry (Renton, 2011). Additionally, these fibers play a role in neurogenic inflammation by releasing neuropeptides that regulate pulpal blood flow and immune cell recruitment (Fristad et al., 1994).

Other names

Pulpal nervesIntradental nervesDental pulp innervationPulpal nociceptors

Local anesthetics block voltage-gated sodium channels on the nerve fiber membrane, preventing the depolarization and conduction of pain signals to the central nervous system.