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Related Experiment Videos

Long-term stability of two different mandibular bridging systems

A L Söderholm1, D Hallikainen, C Lindqvist

  • 1Department of Oral and Maxillofacial Surgery, Helsinki University Central Hospital, Finland.

Archives of Otolaryngology--Head & Neck Surgery
|September 1, 1993
PubMed
Summary

Narrow-beam roentgenography and spiral tomography effectively monitor bone healing after mandibular reconstruction. The AO-THORP system shows superior screw fixation compared to classic AO plates, reducing complications.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Biomaterials Science
  • Medical Imaging

Background:

  • Mandibular reconstruction often utilizes rigid plate fixation for long-term stability.
  • Assessing the long-term success and potential complications of different fixation systems is crucial.
  • Advanced imaging techniques are needed for detailed monitoring of bone-implant interfaces.

Purpose of the Study:

  • To evaluate narrow-beam roentgenography and spiral tomography for monitoring screw and plate fixation in mandibular reconstructions.
  • To compare the efficacy of AO-THORP (Titanium plasma-coated hollow and solid core reconstruction plates) versus classic AO stainless steel plates.
  • To assess bone apposition and fixation integrity over time.

Main Methods:

  • Studied 22 rigid plate bridgings of mandibular defects.

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  • Utilized AO-THORP reconstructions in 13 patients and classic AO stainless steel plates in nine.
  • Employed narrow-beam roentgenography and spiral tomography for detailed examination.

    • Main Results:

    • AO-THORP system demonstrated excellent bone apposition to screws in 96% of cases.
    • Classic AO screw fixation was inadequate in 30% of cases, with 56% plate loosening.
    • Imaging provided detailed information on bone resorption around screws, aiding follow-up decisions.

    Conclusions:

    • Narrow-beam roentgenography and spiral tomography are reliable tools for monitoring mandibular reconstruction.
    • The AO-THORP system offers superior screw fixation and stability compared to classic AO plates.
    • Classic AO plate bridging should be considered temporary due to higher complication rates.