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Metal-porcelain bonding to a magnetizable alloy
M Pezzoli1, E Angelini, G Bruzzone
1University of Torino, Italy.
The Journal of Prosthetic Dentistry
|July 1, 1989
Summary
Magnetizable palladium-cobalt (Pd-Co) alloy shows comparable bond strength to ceramic alloys. This finding suggests its potential use in metal-ceramic dental restorations.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Ceramics
Background:
- Porcelain-fused-to-metal (PFM) restorations are common in dentistry.
- Evaluating new alloys for improved bonding and durability is crucial for clinical success.
Purpose of the Study:
- To compare the bond strength of a magnetizable Pd-Co alloy to porcelain against traditional precious and nonprecious ceramic alloys.
- To investigate the failure modes of these material combinations.
Main Methods:
- Four-point flexure test and direct shear test were employed to assess bond strength.
- Continuous loading until bond failure was performed.
- Fractured surfaces were analyzed using scanning electron microscopy (SEM).
Main Results:
- The magnetizable Pd-Co alloy exhibited good bond strength, comparable to specific ceramic alloys and intermediate between precious and nonprecious alloys.
- Precious alloys primarily failed at the oxide-porcelain interface.
- Nonprecious alloys showed preferential fracture paths between the metal fracture and oxide layer.
- Magnetizable alloy failures occurred at the oxide-porcelain interface and within the porcelain bulk.
Conclusions:
- The magnetizable Pd-Co alloy demonstrates promising bond strength and fracture behavior.
- Its performance suggests potential for application in metal-ceramic abutment crowns.