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Related Experiment Videos

Porcelain shoulder adaptation using direct refractory dies

D M Schneider, M S Levi, D F Mori

    The Journal of Prosthetic Dentistry
    |November 1, 1976
    PubMed
    Summary
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    Direct refractory dies show promise for improving porcelain veneer crown adaptation, potentially achieving clinically acceptable margins. Further research is needed to refine the technique and address uneven adaptation issues.

    Area of Science:

    • Dental materials science
    • Prosthodontics
    • Ceramic engineering

    Background:

    • Porcelain-fused-to-metal (PFM) crowns are widely used in restorative dentistry.
    • Achieving precise marginal adaptation of porcelain veneer crowns is crucial for clinical success and longevity.
    • Direct refractory dies offer a potential method for fabricating PFM crowns with improved fit.

    Purpose of the Study:

    • To evaluate the marginal adaptation of porcelain veneer crowns fabricated using direct refractory dies.
    • To determine if this technique can achieve clinically acceptable fit tolerances.
    • To identify challenges and areas for improvement in the direct refractory die technique.

    Main Methods:

    • Eleven direct refractory dies were created from polysulfide rubber impressions of prepared Dentoform teeth.

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  • Porcelain veneer crowns were fabricated directly on these dies using standard laboratory procedures.
  • Marginal adaptation was quantitatively assessed using a micrometer eyepiece on a dissecting microscope.

    • Main Results:

    • The direct refractory die technique allowed for porcelain adaptation within clinically acceptable gold margin tolerances (39 μm) for average crowns.
    • Crown adaptation was observed to be closer than the typical cement film thickness (20–40 μm).
    • Significant variability in adaptation was noted, and achieving thin margins (<25.4 μm) required meticulous technique and limited firings.

    Conclusions:

    • Direct refractory dies show potential for fabricating porcelain veneer crowns with improved marginal fit.
    • The technique may yield crowns with adaptation within acceptable clinical ranges.
    • Further development is necessary to overcome technique-related challenges and ensure consistent, precise adaptation.