Objectives: Measuring the bond strength between a ceramic crown and a luting agent has involved Instron testing and mechanical evaluations of in-vitro isolated simulation models. Strength was based on the load to fracture value and microscopic evidence of cohesive as compared to adhesive failure at the interface.

Methods: In this study, mechanical bond strength data for three luting agents and the Procera®‚ AllCeram crown were used to design finite element models with "spring" elements positioned between the luting agent and the crown ceramic surface. The higher the spring value (N/mm) the less the potential for movement at the luting/ceramic interface.

Results: In the FEA, a spring value of 20,000 N/mm was needed between Zinc Phosphate and the ceramic elements at load to fracture of 1098 N. For Fuji Plus the spring value was 10 N/mm at a load to fracture of 998 N, and for Panavia 21 a spring value of 2.5 N/mm at load to fracture of 1090 N.

Conclusions: The spring value for Zinc Phosphate was extremely high indicating little or no movement at the interface. The spring value for Fuji Plus and Panavia 21 were much lower indicating movement during loading. Panavia 21 demonstrated move movement than the other two luting agents which may be an indication of bonding.

Supported by Nobel Biocare/University of Michigan Center for Excellence.

Back to the Dental Materials: III - Ceramics and Cements Program
Back to the IADR/AADR/CADR 80th General Session (March 6-9, 2002)

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