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Epoxy putty for free-form external skeletal fixators

S C Roe1, T Keo

  • 1Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, USA.

Veterinary Surgery : VS
|December 5, 1997
PubMed
Summary
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Epoxy putty demonstrates suitability as a connecting beam material for free-form external skeletal fixators. This cost-effective material offers favorable mechanical properties and ease of handling for orthopedic applications.

Area of Science:

  • Biomaterials Engineering
  • Orthopedic Biomechanics
  • Polymer Science

Background:

  • External skeletal fixators are crucial in treating complex fractures.
  • Connecting beams in fixators require robust and reliable materials.
  • Current materials like methacrylates have limitations.

Purpose of the Study:

  • To assess the viability of epoxy putty as a connecting beam material for free-form external skeletal fixators.
  • To compare the mechanical properties of epoxy putty with traditional methacrylate materials.

Main Methods:

  • Mechanical testing of beams (apparent modulus, bending strength, toughness) using three-point bending.
  • Evaluation of pin-material interface shear strength via pull-out testing.
  • Comparison of three methacrylate systems and three epoxy putties.

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Main Results:

  • Epoxy putties exhibited comparable strength and higher apparent modulus than methacrylates, but reduced toughness.
  • The Oatey Epoxy Putty showed superior shear strength at the smooth pin interface compared to methacrylates.
  • Roughened pins significantly enhanced interface strength across all tested materials.

Conclusions:

  • Epoxy putty is a suitable alternative for free-form external fixator connecting beams.
  • Its ease of handling, low cost, and adequate mechanical properties support its clinical use.
  • Further research into interface optimization with roughened pins is recommended.