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Cyclic loading of notched dental composite specimens
1Department of Restorative Dentistry, University of Illinois at Chicago, Chicago, IL 60612-7212, USA.
Summary
This study evaluated the fracture toughness of dental composites under cyclic loading. BelleGlass HP showed the best resistance to cyclic fatigue, outperforming other materials tested.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Mechanical Properties of Polymers
Background:
- Dental composites are widely used restorative materials.
- Understanding their mechanical integrity under functional stress is crucial for clinical longevity.
- Cyclic loading simulates intraoral conditions, impacting material performance.
Purpose of the Study:
- To assess the fracture toughness (K(IC)) of micro-filled, hybrid, nano-filled, and indirect dental composites.
- To investigate the effects of cyclic loading in various environments on composite durability.
Main Methods:
- Four dental composites (Micronew, Renew, Filtek Supreme Plus, BelleGlass HP) were tested.
- Specimens were subjected to cyclic loading (1 to 100,000 cycles) in air, water, artificial saliva, and ethanol-water mixtures.
- Fracture toughness and specimen failure rates were analyzed after aging and loading.
Main Results:
- Cyclic loading significantly affected composite properties, with variations based on aging media and cycle counts.
- Micronew exhibited increased failure and reduced fracture toughness with increased cycles.
- BelleGlass HP, Filtek Supreme Plus, and Renew showed resilience in water and artificial saliva, but some degradation occurred in ethanol-water mixtures or air at higher cycles.
Conclusions:
- BelleGlass HP demonstrated superior resistance to cyclic loading compared to the other tested composites.
- Renew and Filtek Supreme Plus showed intermediate performance.
- Micronew exhibited the lowest resistance to cyclic fatigue and environmental degradation.
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