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Deutsche Version

Patrix Preparation
 
1. When determining the direction of insertion, align the master model at a right angle to the ridge of the jaw.
 
2. Model the crown as usual. Set the patrix (HFA, POM or wax) in close proximity to the stump by use of a parallel mandrell, secure it to the base of the crown an then include it into the crown moulding. The insertion surface results from the shape of the patrix (no milling required).
 
3. Invest the so created unit and cast as usual. Ensure that insertion surface, milling and ball are absolutely free of wax residues.
Prepare as usual; no work on the primary element required.
 
4. Face the crown in the usual way. Full facings can be implemented, except for the parallel border surface of the patrix. After facing polish the patrix initially with a silver wire brush and then polish it with polishing paste and a soft brush.
Caution: No material may be removed from the ball (polishing without loss of material)!