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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
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.
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).
- 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.