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Interface radiation dosimetry in mandibular reconstruction.

H C Schwartz, M Wollin, D L Leake

    Archives of Otolaryngology (Chicago, Ill. : 1960)
    |May 1, 1979
    PubMed
    Summary
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    Metallic trays used in mandibular reconstruction significantly increase radiation dose, potentially harming surrounding tissues. Using nonmetallic trays helps maintain dose homogeneity during radiation therapy, avoiding excessive irradiation and soft-tissue reactions.

    Area of Science:

    • Biomaterials Science
    • Radiation Oncology
    • Medical Physics

    Background:

    • Radiation therapy can cause dose enhancement at interfaces between different materials.
    • Mandibular reconstruction often involves implantable trays, creating such interfaces.
    • Understanding dose distribution is crucial for patient safety during radiation treatment.

    Purpose of the Study:

    • To investigate the impact of different mandibular tray materials on radiation absorbed dose.
    • To determine if metallic or nonmetallic trays affect dose homogeneity in surrounding tissues.
    • To provide recommendations for material selection in mandibular reconstruction prior to radiation therapy.

    Main Methods:

    • Radiation dose measurements were performed in tissue-equivalent material surrounding implants.

    Related Experiment Videos

  • Four tray materials were tested: titanium, vitallium, stainless steel (metallic), and Dacron/polyetherurethane (nonmetallic).
  • Absorbed dose was quantified adjacent to each implant type.

    • Main Results:

    • Metallic trays (titanium, vitallium, stainless steel) showed a significant absorbed dose enhancement of 29% to 36%.
    • The nonmetallic Dacron/polyetherurethane tray exhibited only a 1% dose enhancement.
    • Dose enhancement was directly related to the atomic number difference at the material interface.

    Conclusions:

    • Metallic implants in mandibular reconstruction can lead to substantial, localized increases in radiation dose.
    • Nonmetallic trays minimize radiation dose enhancement, preserving dose homogeneity.
    • Selecting nonmetallic materials for mandibular trays is recommended to avoid excessive irradiation and potential soft-tissue complications during radiation therapy.