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Related Experiment Videos

A comparative study of ceramic crown margins constructed using different techniques.

A Lomanto1, S Weiner

  • 1New Jersey Dental School, Newark.

The Journal of Prosthetic Dentistry
|June 1, 1992
PubMed
Summary
This summary is machine-generated.

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This study evaluated direct lift-off techniques using different porcelain carriers. Vita thermoplastic material showed the smallest marginal gaps, indicating superior fit for dental restorations.

Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Ceramic Engineering

Background:

  • The direct lift-off technique is crucial for fabricating precise dental restorations.
  • Variations in carrier materials can influence the marginal fit of porcelain restorations.
  • Accurate marginal adaptation is essential for the longevity and success of dental crowns.

Purpose of the Study:

  • To compare the marginal gap formation of three direct lift-off techniques using different carrier materials.
  • To evaluate the influence of Vita, Ducera, and Dentsply Spectrum materials on marginal gap dimensions.
  • To determine the optimal carrier material for minimizing marginal discrepancies during porcelain fabrication.

Main Methods:

  • Three commercially available porcelain materials (Vita, Ducera, Dentsply Spectrum) were tested.

Related Experiment Videos

  • Marginal gap widths were measured at four firing stages: shoulder, body-incisal, glaze, and correction.
  • Measurements were taken at three sites per specimen for each firing stage.

    • Main Results:

    • All tested techniques yielded clinically acceptable marginal gaps.
    • The Vita thermoplastic carrier resulted in the smallest marginal gap across most stages.
    • Ducera material exhibited the largest marginal gaps specifically after the glaze firing stage.

    Conclusions:

    • The choice of carrier material significantly impacts marginal gap formation in direct lift-off techniques.
    • Vita thermoplastic carrier material demonstrates the most favorable marginal fit for porcelain restorations.
    • Further research may explore other material properties influencing marginal adaptation in dental ceramics.