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By combined stamped crowns






The most simple design metall-plastic crown is the stamped crown, faced with plastic veneers (Y.I.Belkin, 1947).

The abutment tooth prepares as well as on the full metal stamped crown. Obtain prints, send them to a lab, make stamped crown. After crown checking (fitting) in the mouth abutment tooth further ground off with a cutting, vestibular and contact surfaces on the thickness of the plastic facing (1, 0-1, 5 mm). The vestibular surface of the metal crown drilled hole, the crown is filled heated wax and put on the abutment tooth. Inside the crown of wax is obtained by the imprint of the prepared tooth stump. The remaining wax layer corresponds to the thickness of hard tissues, grinded for making facing. Excess wax is squeezed out of the crown after the overlay. Without removing the crown obtain print of the dentition. After removing imprint crown installed in its place and cast working model from the gypsum.

Crown is heated, remove from the working model; remove the remnants of wax and polish. Scrollsaw vestibular wall of the crown, leaving a narrow rim in the gum part. At the cutting edge of metall is removed, so that after facing the rest of the cutting edges are not acted out of plastic, and was not visible in smiling. Around the edge of the window from the vestibular surface makes slicing serving retention points for the plastic facing. Formed teeth are bred in lip and oral side alternately. Cuts should not be parallel. As a rule, do not make cuts in the gum rim.

Prepared frame stamped crown is set on a working model and simulate (sculpture) by means wax anatomical form of vestibular surface with regard to the shape of adjacent teeth.

Gypsum in dental flask and replace the wax on the plastic. After polymerization, the crown is removed from the flask, trim, grind (machining) and polishing.

V.C.Pogodin (1983) proposes to leave from the stamped crowns only that part on the oral surface of the tooth, which has contact with the antagonists. In this method, a plastic facing will cover the vestibular surface, a significant portion of contact surfaces, completely cutting edge (as a plastic crown). This allows for correction of the anatomical shape and the cutting edge of the crown during the inspection in the mouth on the reference tooth and prevent fracture of facing. Indications to application of crowns without rim, as the author, are the diastema between the teeth, short upper lip, deeply incisive overlap.

 

 

Fig.1. Combined stamped crowns by Y.I.Belkin (а) and V.C.Pogodin (б)

 


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