The Strength of Cemented Alumina Core and Magnesia Core Crowns

Hondrum, Steven O.
September 1988
International Journal of Prosthodontics;Sep/Oct1988, Vol. 1 Issue 2, p190
Academic Journal
The fracture strengths of internally glazed or foil-retained magnesia core and alumina core artificial crowns were compared. Forty specimens were luted to epoxy resin master dies using zinc phosphate cement. Force was applied in an axial direction using an Instron universal testing machine. The mean failure value for restorations with retained platinum foil was 20% higher than restorations with internally glazed surfaces. These findings were contrary to previously published reports. The effect of the luting material, the axial nature of the applied force, and the strength gained by retaining the platinum foil in the restoration are thought to contribute to the results.


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