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Related Experiment Videos

Mechanical evaluation of a soft cast material

M G Zmurko1, S M Belkoff, J E Herzenberg

  • 1Division of Orthopedic Surgery, University of Maryland School of Medicine, Baltimore 21201-1192, USA.

Orthopedics
|August 1, 1997
PubMed
Summary

Scotchcast SoftCast (SCS) offers lower stiffness and yield force compared to rigid plaster of paris (POP) and Scotchcast Plus (SCP) casting materials. SCS is suitable for non-rigid applications, not for situations requiring rigid immobilization.

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Area of Science:

  • Orthopedics and Biomedical Engineering
  • Materials Science in Medical Devices

Background:

  • Casting materials are crucial for fracture immobilization and healing.
  • Existing rigid materials like plaster of paris (POP) and Scotchcast Plus (SCP) provide robust support.
  • A need exists for materials with varying degrees of flexibility for different clinical applications.

Purpose of the Study:

  • To compare the structural and material properties of a new semi-rigid casting material, Scotchcast SoftCast (SCS).
  • To evaluate SCS against established rigid materials: plaster of paris (POP) and Scotchcast Plus (SCP).
  • To determine the suitability of SCS for applications requiring different levels of immobilization.

Main Methods:

  • Fabrication of cylinders and flat beams using 4, 6, 8, and 10 layers of SCS, POP, and SCP.

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  • Mechanical testing of the fabricated samples using three-point bending.
  • Mechanical testing using diametrical compression to assess material properties.

    • Main Results:

    • Scotchcast SoftCast (SCS) exhibited significantly lower initial stiffness compared to both POP and SCP.
    • SCS demonstrated significantly lower yield force values across all tested layer thicknesses.
    • The mechanical properties of SCS were consistently inferior to the rigid POP and SCP materials.

    Conclusions:

    • Scotchcast SoftCast (SCS) is a semi-rigid material with demonstrably lower mechanical strength than rigid POP and SCP.
    • SCS may be appropriate for orthopedic applications where non-rigid support is desired.
    • SCS is not recommended for clinical situations necessitating rigid immobilization due to its lower stiffness and yield force.