A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . l of the obturator-model fromits investment, as will be described. Before filling these V-shaped spaces, however,the obturator-model must be removed to permit deepening and roughening thesurfaces so that the added plaster will perfectly adhere. The above restoration,however, is not always necessary with every cleft. One should fully appreciatethat this original model of the cleft (Figs. 19 and 20) represents the only surfaceswhich the obturator is supposed to exactly fit the har
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . l of the obturator-model fromits investment, as will be described. Before filling these V-shaped spaces, however,the obturator-model must be removed to permit deepening and roughening thesurfaces so that the added plaster will perfectly adhere. The above restoration,however, is not always necessary with every cleft. One should fully appreciatethat this original model of the cleft (Figs. 19 and 20) represents the only surfaceswhich the obturator is supposed to exactly fit the hard parts of the mouth and nasalcavity. It should, therefore, be carefully protected from injury through the manytechnic trials to which it is subjected. In preparing the plaster working-model for investment in the flask, the pos-terior ends c, Fig. 21, should extend no farther than the requirements of thelingual portion of the obturator, with surfaces slanting slightly upward and for-ward. Space should be allowed at the lingual borders of the obturator for a concaveseating g, as will be described later. Fig. 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. 28.
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Keywords: ., bookcentury1900, bookdecade1920, bookidpracticaltre, bookyear1921
