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Methylmethacrylate implants: a scanning electron microscopic study.

K Mishima1, N Matsunaga, T Amemiya

  • 1Department of Ophthalmology, Nagasaki University School of Medicine, Japan.

Annals of Plastic Surgery
|June 1, 1991
PubMed
Summary
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Scanning electron microscopy revealed degradation in two methylmethacrylate orbital implants after long-term use. One implant showed reduced magnetic force and rust, indicating material breakdown over time.

Area of Science:

  • Ophthalmology
  • Biomaterials Science
  • Materials Engineering

Background:

  • Orbital implants made of methylmethacrylate are used to restore ocular volume after enucleation.
  • Long-term performance and degradation of these implants are critical for patient outcomes.
  • Understanding material changes is essential for improving implant longevity.

Observation:

  • Two methylmethacrylate orbital implants, in use for 34 and 5 years, were analyzed using scanning electron microscopy (SEM).
  • One implant incorporated a prosthesis with a magnetic component.
  • SEM examination focused on surface morphology and material integrity.

Findings:

  • Significant surface irregularities and roughness were observed on the methylmethacrylate material.
  • The implant containing a magnet exhibited a marked decrease in magnetic force.

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  • Rust crystals were identified on the magnetic component, indicating corrosion.

    • Implications:

    • Long-term exposure to the orbital environment can lead to degradation of methylmethacrylate implants.
    • Corrosion of magnetic components may compromise the functionality of combined prostheses.
    • Findings suggest a need for improved biomaterials or surface treatments to enhance implant durability.