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Related Experiment Videos

The stability of temporary prosthetic base materials. I: Introduction, angular changes and dimensional stability

J R Heath1, T K Boru, A A Grant

  • 1Department of Restorative Dentistry, Dental School, University of Manchester, U.K.

Journal of Oral Rehabilitation
|July 1, 1993
PubMed
Summary

Optimally manipulated shellac materials show less dimensional change than acrylic resin or wax for denture bases. Proper handling techniques are crucial for accurate fit and retention of shape in occlusal rims and trial dentures.

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Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Biomaterials Engineering

Background:

  • Accurate fit of occlusal rims and trial denture bases to casts and the patient's mouth is essential in prosthodontics.
  • Understanding the dimensional stability of baseplate materials is critical for successful denture fabrication.

Purpose of the Study:

  • To evaluate the shape and dimensional retention of grey and pink shellac, cold cure acrylic resin, and wax baseplate materials.
  • To determine the optimal manipulation techniques for minimizing dimensional changes in these materials.

Main Methods:

  • Strips and sheets of shellac, acrylic resin, and wax were molded over stylized edentulous casts.
  • Materials were softened via flame or water bath, with specimens prepared folded and unfolded.

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  • Angular changes, gap formation, and linear dimensions were measured after molding, thermal cycling, and room temperature storage.

    • Main Results:

    • Unfolded grey shellac, flame-softened and finger-molded on an unwarmed cast, exhibited the least angular change.
    • Pink shellac, water-bath softened and finger-molded on a warmed cast, showed the minimal gap.
    • Grey shellac, water-bath softened and finger-molded on a warmed cast, demonstrated the smallest dimensional change.

    Conclusions:

    • Optimally manipulated shellac materials exhibit superior dimensional stability compared to cold cure acrylic resin and modeling wax.
    • Specific manipulation techniques, including softening method, molding pressure, and cast temperature, significantly influence the dimensional accuracy of shellac baseplates.