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Dynamic fatigue of feldspathic porcelain
C W Fairhurst1, P E Lockwood, R D Ringle
1Department of Dental Materials, Medical College of Georgia, School of Dentistry, Augusta.
Summary
This study evaluated fatigue parameters in dental ceramics using dynamic fatigue testing. The research determined critical material properties for dental porcelains, crucial for understanding material durability and performance in oral environments.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Ceramics Research
Background:
- Stress corrosion fatigue is a known issue in dental porcelains, impacting their long-term durability.
- Previous research has assessed slow crack growth parameters in dental ceramics.
- Understanding fatigue behavior is critical for improving the reliability of dental restorations.
Purpose of the Study:
- To evaluate the fatigue parameters of a model experimental porcelain.
- To utilize dynamic fatigue testing to assess material properties.
- To determine crack growth exponent (n) and inert strength constant (sigma f0) for dental ceramics.
Main Methods:
- Dynamic fatigue testing with varying constant stressing rates (0.001 to 100 MPa/s) was employed.
- Biaxial flexure strength of 300 model porcelain specimens (1 mm thick) was tested in 37°C water.
- 100 specimens were tested in a moisture-free environment, and a commercial porcelain was used as a reference.
Main Results:
- The study successfully calculated fatigue parameters (n and sigma f0) for the model porcelain.
- Data on crack velocity and material constants were obtained under simulated oral conditions.
- Comparative data with a commercial dental porcelain (Jelenko Gingival) was generated.
Conclusions:
- Dynamic fatigue testing provides essential data for characterizing dental ceramic performance.
- The determined fatigue parameters are vital for predicting the service life of dental restorations.
- This research contributes to the development of more durable and reliable dental materials.