Dentin Defenses: Reparative Dentin

Dentin Defenses: Dentinal tubules are a potential pathway for the diffusion of noxious chemicals or microorganisms to the pulp. The dentin has a limited capacity for its own defense – by the complete or partial closure (obliteration) of the tubules via the following processes: Defense Process
Definition
Source
Mechanism Dentinal Sclerosis   Histologically, sclerosed dentin appears as Read More…

Sources of “Insults” to the Pulp

Insults
Reason For Pulpal Damage Dental caries
Microbial invasion and host inflammatory response to microbes and their byproducts. Microleakage in restored teeth
The presence of a gap between the tooth and restoration leads to bacterial entry and resultant pulpal inflammation. Trauma (Mechanical trauma; With intact tooth structure)
This is associated with luxation / avulsion injuries. TRead More…

CORRELATION BETWEEN CLINICAL PAIN & PULP NEUROBIOLOGY

  CLINICAL CONDITION
HISTOLOGICAL PICTURE Hypersensitive exposed dentin
Elevated number of nerve fibers in underlying pulp and dentin (“nerve sprouting” occurs in response to inflammatory stimuli). Silent Pulpitis
Fibrotic changes in pulp forms a barrier between the lesion & the nerve fibers. Co-existence of vital pulp & periapical lesions
May be caused by CGRP nerve sprRead More…

SENSORY NERVES OF THE PULP

  SENSORY NERVE TYPE
FEATURES Nerve endings of myelinated A-delta fibers
·     Involved in sharp pain sensations. ·     Most sensitive to stimuli that cause movement of dentinal fluid à “hydrodynamic stimuli”. ·     It is still unknown whether these receptors are present in dentin, predentin, odonbtoblastic layer, pulp, or a combination of these sites. C-fibers
Read More…