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PROCESSING
Bridges and crowns made of zirconium oxide are individual precision items and can easily be processed.
PREPARATION
General
-preparation suitable for ceramic, i.e. avoids sharp corners, edges and internal corners
-circular chamfers with cervical edge of at least 0.8 mm
-circular shoulder with rounded internal corners
-occulusal and incisal reduction for faced crowns: 1.5 mm to 2.0 mm
-minimum stump height: 3 mm
Contraindications are:
-deep cavities in the occlusal area
-rising chamfers (gutter preparation)
-finished margins
PREPARATION THE FRAMEWORK
After examining the fit, contact points and occlusion, the inner surfaces of the crown are cleaned using corundum blasting (aluminium oxide, 110 micromi, pressure 2 bar) followed by evaporation
FIXING
Conventional cementing
Due to the high degree of rigidity and stability of Ceramill ZI frameworks, conventional fixing with
-zinc oxide phosphate cement or
-glass ionomer luting (e.g. GC Fuji Plus) is possible in most cases
With conventional cementing, make sure that there is sufficient retention and that the minimum stump height is 3 mm
Adhesive fixing
For adhensive fixing, we recommend the fixing composites Panavia 21 or Panavia F 2.0 due to their excellent adhensive with the zirconium oxide framework material
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