A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . after the dough has been removed, show-ing the original plaster-model A with the obturator-model in position in the lingualhalf of the flask and resting now upon the plaster nasal model B, which has justbeen poured into the flask, and finished ready for pouring the plaster palatal modelC, Fig. 31. Remember after each plaster and investment model is poured, all 462 PART IX. THE PROSTHETIC CORRECTION OF CLEFT PALATE the parts should be removed from the flask for finishing the newl
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . after the dough has been removed, show-ing the original plaster-model A with the obturator-model in position in the lingualhalf of the flask and resting now upon the plaster nasal model B, which has justbeen poured into the flask, and finished ready for pouring the plaster palatal modelC, Fig. 31. Remember after each plaster and investment model is poured, all 462 PART IX. THE PROSTHETIC CORRECTION OF CLEFT PALATE the parts should be removed from the flask for finishing the newly poured modeland preparing the flask for the next pouring. In removing the plaster models fromthe flask after pouring, the flask is held loosely in the hand with the fingers andthumb doubled under arid lightly touching the edges of the model to prevent itfrom suddenly falling out and breaking, the flask is then tapped sharply with alight hammer on the under side of one of its ends, the fingers being able to detectand guide the slightest movement of the model as it falls from the flask. If the Fic. 31. Fig. Lengthwise sectional views through the plaster, investment, and obturator-mod els. The above shows the Models A and C inthe flask with the dough placed prepara-tory to pouring the Investment Model E. plaster model clings to the model of the veil, showing that it has lapped beyond itstrue drawing line, loosen it carefully with a spatula. After its removal, itsfinishing consists in correcting all drawing and overlapping lines at v v andparting edges at u u, Fig. 34. Before returning the casts to the flask, varnish only the surfaces that are tOcome in contact with the next model to be poured. Finally, if oil is used over thesurfaces of the mold before pouring, stand the flask on edge that the excess oilin pockets may drain oft. One of the most important movements in the whole process is to secure abso-lute coaptation of the models at g and x, Fig. 31, in replacing them in
Size: 2010px × 1243px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidpracticaltre, bookyear1921
