A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . The Flask Fig. 27 illustrates the cleft palate flask closed with its lingual and nasal covers(named according to their relations to the cleft), and provided with fittings to holdthe parts firmly in position during vulcanizing, etc. The body of the flask is beveledand finished on the inside, as shown by Fig. 28, which gives an interior view of a 458 PART IX. THE PROSTHETIC CORRECTION OF CLEFT PALATE vertical antero-posteiibr section through the body. The beveled planes dividethe
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . The Flask Fig. 27 illustrates the cleft palate flask closed with its lingual and nasal covers(named according to their relations to the cleft), and provided with fittings to holdthe parts firmly in position during vulcanizing, etc. The body of the flask is beveledand finished on the inside, as shown by Fig. 28, which gives an interior view of a 458 PART IX. THE PROSTHETIC CORRECTION OF CLEFT PALATE vertical antero-posteiibr section through the body. The beveled planes dividethe contents of the flask into lingual and nasal halves, which permit the separa-tion and removal of the casts from the flask, and from each other. The round Fig. holes in the sides of the flask are for the insertion of a screw-driver to separatethe upper and lower metal casts after they have been poured, and also after vul-canizing. These should be filled with investment to present a smooth surface onthe inside of the flask, until needed. Preliminary Principles With the model of the obturator finished and on the working-model of thecleft, the object now is to completely invest the obturator-model in parts in plasterwhich may be easily removed from the flask, and cleanly separated from each otherand the obturator-model intact. It therefore must be apparent that when theseplaster parts are duplicated in metal and the space of the obturator-model ispacked with rubber and vulcanized, the hard rubber obturators can be easilyremoved from the metal casts ready for finishing, in the same way that dentistspack, vulcanize, and finish their rubber plates. On the same principle that dentists invest the trial plate of a rubber denturein plaster—one surfa
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Keywords: ., bookcentury1900, bookdecade1920, bookidpracticaltre, bookyear1921
