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Related Experiment Videos

Compatibility of ceramic-ceramic systems for fixed prosthodontics

P J Steiner1, J R Kelly, A A Giuseppetti

  • 1National Naval Dental Center, Bethesda, Maryland, USA.

The International Journal of Prosthodontics
|July 1, 1997
PubMed
Summary

Dilatometric data accurately predicts ceramic-ceramic compatibility. Thermal contraction differences below 1 x 10(-6)/degree C indicate successful porcelain veneering, minimizing crack formation in dental restorations.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Ceramics

Background:

  • Ceramic-ceramic compatibility is crucial for dental restorations.
  • Predicting porcelain-coping interactions is essential for long-term restoration success.
  • High-expansion IPS-Empress porcelain requires compatible veneering materials.

Purpose of the Study:

  • To evaluate dilatometric data for predicting ceramic-ceramic compatibility.
  • To correlate thermal contraction differences with porcelain failure rates.
  • To assess the utility of standard dilatometry in dental ceramic applications.

Main Methods:

  • Porcelains with varying leucite content were fired onto IPS-Empress copings (n=72).
  • Thermal contraction coefficients (alpha) were measured using dilatometry (ISO 9693).

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  • Crack formation (failure) was assessed, and probability of failure (Pf) calculated.

    • Main Results:

    • Significant differences in thermal contraction coefficients (alpha) were observed (7.92-17.83 x 10(-6)/degree C).
    • Compatible porcelains (no cracks) exhibited a delta alpha magnitude < 1 x 10(-6)/degree C.
    • Dilatometry proved surprisingly predictive of failure probability despite cooling rate differences.

    Conclusions:

    • Standard dilatometry is a viable method for predicting ceramic-ceramic compatibility in dental applications.
    • Minimizing the absolute difference in thermal expansion is key to preventing cracks.
    • Three specific porcelains (IPS-Empress dentin, Duceram, Will-Ceram) demonstrated successful veneering of IPS Empress cores.