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Inflammation01:38

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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Chronic Inflammation: Introduction01:12

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Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...
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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
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Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
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Development of a Direct Pulp-capping Model for the Evaluation of Pulpal Wound Healing and Reparative Dentin Formation in Mice
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Inflammation and regeneration in the dentin-pulp complex: a double-edged sword.

Paul R Cooper1, Michelle J Holder1, Anthony J Smith1

  • 1Oral Biology, School of Dentistry, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom.

Journal of Endodontics
|April 5, 2014
PubMed
Summary

Dental infections activate innate immune responses via molecular signaling. Controlling inflammation is key for tissue repair, suggesting new immunomodulatory treatments for endodontics.

Keywords:
Dentinenamelepigeneticextracellular matrixhistone deacetylase inhibitorsinterleukinslow-level light therapymigrationpulpreactive oxygen species

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Area of Science:

  • Immunology
  • Dental Biology
  • Molecular Signaling

Background:

  • Dental infections trigger innate immune responses involving various cells in the dentin-pulp complex.
  • Pattern recognition receptors, like Toll-like receptors, detect bacterial components, initiating intracellular signaling cascades.

Purpose of the Study:

  • To elucidate the molecular and cellular mechanisms of innate immune activation in dental infections.
  • To explore the role of inflammation in dental tissue repair and potential therapeutic strategies.

Main Methods:

  • Review of molecular and cellular signaling pathways in response to dental pathogens.
  • Analysis of immune cell involvement and mediator expression in the dentin-pulp complex.
  • Examination of the temporal effects of inflammation on tissue repair.

Main Results:

  • Bacterial detection by odontoblasts and pulpal cells activates signaling pathways (NF-κB, p38 MAPK).
  • Proinflammatory mediators (cytokines, chemokines) are upregulated, recruiting immune cells but potentially causing collateral damage.
  • Inflammation resolution promotes repair, while chronic inflammation inhibits it, indicating context-dependent mediator effects.

Conclusions:

  • Understanding immune signaling in dental infections is crucial for therapeutic development.
  • Anti-inflammatory and immunomodulatory approaches, including molecular and photobiomodulatory technologies, show promise for endodontic treatments.