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Related Experiment Videos

Marginal gap width of a new refractory porcelain system

F M McIntyre1, R A Bochiechio, R Johnson

  • 1Department of Fixed Prosthodontics, School of Dental Medicine, State University of New York, Buffalo.

The Journal of Prosthetic Dentistry
|June 1, 1993
PubMed
Summary
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Matching refractory die material to porcelain significantly improves marginal accuracy in porcelain inlays. This optimization reduces the marginal gap, enhancing restoration fit and longevity.

Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Ceramic Restorations

Background:

  • Marginal accuracy is crucial for the longevity and fit of indirect dental restorations.
  • Porcelain inlays require precise adaptation to tooth preparations to prevent secondary caries and maintain occlusal harmony.
  • Refractory die materials play a key role in the fabrication of accurate ceramic restorations.

Purpose of the Study:

  • To evaluate if matching the physical properties of refractory die material to porcelain enhances the marginal accuracy of porcelain inlays.
  • To compare the marginal gap of porcelain inlays fabricated using a matched refractory system versus an unmatched system.

Main Methods:

  • Fabrication of 30 addition-silicone impressions from a master inlay preparation.
  • Creation of 15 refractory dies for each of two material systems: one matched (Fortune) and one unmatched (Vita porcelain with Polyvest refractory).

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  • Measurement of the marginal gap using a microscope with micrometer adjustment on prepared dies with applied porcelain.

    • Main Results:

    • The matched refractory porcelain system resulted in a significantly smaller mean marginal gap (51.24 ± 20.84 microns) compared to the unmatched system (100.43 ± 17.30 microns).
    • A Student's t-test confirmed a statistically significant difference (p < 0.005) in marginal gap between the matched and unmatched systems.
    • The unmatched system exhibited a substantially larger mean marginal gap, indicating poorer adaptation.

    Conclusions:

    • Matching the physical properties of refractory die material to porcelain significantly improves the marginal accuracy of porcelain inlays.
    • Utilizing a matched refractory porcelain system is recommended for achieving superior fit and potentially better clinical outcomes in porcelain inlay fabrication.
    • This finding has implications for optimizing material selection in dental laboratories for enhanced restoration quality.