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Pulp innervation after radiation therapy.

J C Knowles, V A Chalian, H Shidnia

    The Journal of Prosthetic Dentistry
    |December 1, 1986
    PubMed
    Summary
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    Radiation therapy can decrease tooth sensitivity, affecting mandibular teeth immediately and maxillary teeth later. This functional impairment occurs even in histologically normal nerve tissue, impacting blood flow and nutrition over time.

    Area of Science:

    • Oral oncology
    • Radiation biology
    • Dental science

    Background:

    • Radiation therapy is a common cancer treatment.
    • Dental complications, including altered tooth sensitivity, can occur post-radiation.
    • Understanding the mechanisms of these changes is crucial for patient care.

    Purpose of the Study:

    • To investigate the impact of radiation on tooth sensitivity.
    • To correlate sensitivity changes with the location relative to the irradiated field and nerve trunk.
    • To explore the relationship between sensitivity, blood flow, nutrition, and time post-irradiation.

    Main Methods:

    • Observation of tooth sensitivity in patients undergoing radiation therapy.
    • Assessment of sensitivity in teeth within, adjacent, and distant to the irradiated field.

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  • Monitoring of blood flow rates and nutritional status over time.
  • Histological examination of nerve tissue.

    • Main Results:

    • Decreased tooth sensitivity was observed within and adjacent to the irradiated field.
    • Mandibular teeth outside the field showed immediate sensitivity decrease, while maxillary teeth showed a delayed decrease.
    • Functional impairment of neurons was noted despite minimal histological changes in nerve tissue.
    • Blood flow and nutrition were time-dependent.

    Conclusions:

    • Radiation therapy significantly impacts tooth sensitivity, with varying onset depending on tooth location and proximity to irradiated nerves.
    • Functional neuronal impairment can occur without apparent histological damage, suggesting complex radiobiological effects.
    • Time, blood flow, and nutrition are critical factors influencing post-radiation dental changes.