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Related Experiment Videos

Dimensional stability of record bases fabricated from light-polymerized composite using two methods

K G Boberick1, J McCool

  • 1Department of Operative Dentistry, Temple University School of Dentistry, Philadelphia, PA 19140, USA.

The Journal of Prosthetic Dentistry
|May 12, 1998
PubMed
Summary

Modified fabrication of light-cured composite record bases significantly reduces posterior border gaps. Stage curing with foil protection minimizes polymerization shrinkage, improving fit and reducing distortion in dental prosthetics.

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Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Biomaterials Engineering

Background:

  • Resin-based composite record bases are prone to polymerization shrinkage during curing.
  • This shrinkage can cause distortion and significant gaps at the posterior border of dental prosthetics.
  • Accurate fit is crucial for the function and stability of record bases.

Purpose of the Study:

  • To evaluate gap formation in maxillary record bases made from light-cured composite (Triad).
  • To determine if altering fabrication methods impacts gap size and pattern.
  • To analyze the effects of composite width and time on gap formation.

Main Methods:

  • Twenty record bases were fabricated using two methods: manufacturer's directions (full light exposure) and a modified stage-curing technique with foil protection.

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  • Bases were tested 1 hour and 7 days post-fabrication.
  • Gap measurements were taken at the posterior border and at 5 mm increments along the palatal area.

    • Main Results:

    • Both fabrication methods resulted in dimensional changes and gap formation.
    • The manufacturer's method (method 1) produced larger mean gap sizes at the posterior border compared to the modified stage-curing method (method 2).
    • Composite width did not significantly influence gap size.

    Conclusions:

    • The modified stage-curing technique (method 2) consistently resulted in smaller average gap sizes than the standard method (method 1).
    • Partially shielding the composite during light curing and readapting between stages significantly reduces posterior border gap formation.
    • This modified technique offers improved adaptation for resin-based composite record bases.