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Published on: December 20, 2024
Fatigue behaviour of dental composite materials
James L Drummond1, Lihong Lin, Lulwa A Al-Turki
1Department of Restorative Dentistry, University of Illinois at Chicago, 60612-7212, USA. drummond@uic.edu
Journal of Dentistry
|February 3, 2009
Summary
Indirectly processed dental composites with large particle fillers demonstrated superior cyclic fatigue resistance compared to directly processed materials and those with micro- or nano-particle fillers. Ethanol-water mixtures negatively impacted fatigue life.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Mechanical Properties of Polymers
Background:
- Dental composites are widely used restorative materials.
- Understanding their fatigue behavior is crucial for clinical longevity.
- Filler type and processing method influence composite properties.
Purpose of the Study:
- To evaluate the cyclic fatigue resistance of particle and fiber-filled dental composites.
- To compare directly versus indirectly fabricated composite specimens.
- To assess the effect of environmental aging on fatigue life.
Main Methods:
- Five dental composites were tested: three direct (Restolux, Renew, Filtek Supreme) and two indirect (BelleGlass, Tescera).
- Notched bar specimens underwent cyclic loading (5-49 MPa) up to 100,000 cycles.
- Specimens were aged in various media, including water and ethanol-water mixtures.
Main Results:
- Indirectly processed composites (BelleGlass, Tescera) and Restolux showed higher fatigue resistance.
- Renew and Filtek Supreme exhibited lower fatigue resistance.
- An ethanol-water mixture significantly reduced fatigue resistance across all materials.
Conclusions:
- Indirect processing and large particle fillers enhance cyclic fatigue resistance in dental composites.
- Micro- and nano-particle fillers showed lower fatigue performance.
- Environmental factors, like ethanol exposure, can compromise fatigue durability.
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