Comparative mechanical property characterization of 3 all-ceramic core materials
1American Dental Association Health Foundation, Paffenbarger Research Center, Gaithersburg, Maryland, USA.
The International Journal of Prosthodontics
|May 18, 2000
Summary
High-purity and glass-infiltrated alumina offer superior strength and toughness for dental ceramics compared to leucite-reinforced glass. These advanced materials provide better clinical predictability for dental restorations.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Ceramics
Background:
- Ceramic core materials are crucial for dental restorations, influencing longevity and clinical success.
- Understanding the mechanical properties of these materials is essential for predicting failure and optimizing treatment outcomes.
- Flaw size significantly impacts the strength and fracture toughness of brittle dental ceramics.
Purpose of the Study:
- To rank three ceramic core materials based on biaxial flexural strength and fracture toughness.
- To provide clinicians with data for predicting the clinical performance of dental restorations.
- To compare the mechanical properties of leucite-reinforced glass, glass-infiltrated sintered alumina, and high-purity, high-density alumina.
Main Methods:
- Biaxial flexural strength was determined using the piston-on-3-ball method.
- Plane-strain fracture toughness was measured via the short-bar chevron-notch method.
- Three ceramic types were evaluated: leucite-reinforced glass, glass-infiltrated sintered alumina, and high-purity, high-density alumina.
Main Results:
- High-purity, high-density alumina and glass-infiltrated sintered alumina exhibited significantly higher biaxial flexural strength than leucite-reinforced glass.
- Glass-infiltrated sintered alumina demonstrated superior fracture toughness compared to high-purity, high-density alumina.
- All tested ceramic core materials met the International Standards Organization's minimum strength requirements.
Conclusions:
- Glass-infiltrated sintered alumina and high-purity, high-density alumina offer enhanced strength and toughness over conventional core materials.
- While glass-infiltrated sintered alumina possesses higher fracture toughness, high-purity, high-density alumina shows greater flexural strength.
- The findings support the use of advanced alumina-based ceramics for improved durability in dental applications.
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