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Fracture strength of 5 different all-ceramic crown systems
1Department of Prosthodontics, Albert-Ludwig University, Freiburg, Germany.
The International Journal of Prosthodontics
|February 19, 1999
Summary
All-ceramic crowns show comparable fracture resistance to porcelain-fused-to-metal crowns. However, aging significantly reduces their strength, necessitating further in vivo research for clinical use.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Prosthodontics
Background:
- All-ceramic crowns are increasingly used for anterior restorations due to esthetic demands.
- Evaluating the long-term durability and fracture resistance of these materials is crucial for clinical success.
Purpose of the Study:
- To assess the fracture resistance of five distinct all-ceramic crown systems.
- To compare their performance before and after simulated aging (cyclic preloading).
- To benchmark against traditional porcelain-fused-to-metal (PFM) crowns.
Main Methods:
- Five all-ceramic systems (In-Ceram, Empress, Celay) and PFM crowns were fabricated on natural maxillary incisors.
- Specimens underwent simulated aging including chewing simulation and thermocycling.
- Fracture strength was determined and compared between groups.
Main Results:
- Cyclic preloading and thermocycling significantly reduced the fracture strength of all tested all-ceramic crown systems (P < 0.01).
- No statistically significant differences in fracture strength were observed between the all-ceramic groups and the PFM control group after aging.
Conclusions:
- All-ceramic crowns demonstrate potential for anterior restorations with comparable strength to PFM crowns.
- Clinical application requires caution, advocating for in vivo studies prior to routine implementation.