. A manual of mechanical dentistry and metallurgy . sely, the effect of the stippling is verypleasing. Manner of Flasking.—The flasking or investing of thecase should receive quite as much care as in rubber mount the model high in the shallow half of the flask,especially designed for celluloid. Now pour in thin plasteruntil it just reaches the lower edge of the plate. Whenthe plaster is set sufficiently, trim it to the proper shape forseparating, and then coat it with the liquid soap. Placethe deep ring of the flask in position and very carefully fill CELLULOID AS A DENTAL BASE. 67
. A manual of mechanical dentistry and metallurgy . sely, the effect of the stippling is verypleasing. Manner of Flasking.—The flasking or investing of thecase should receive quite as much care as in rubber mount the model high in the shallow half of the flask,especially designed for celluloid. Now pour in thin plasteruntil it just reaches the lower edge of the plate. Whenthe plaster is set sufficiently, trim it to the proper shape forseparating, and then coat it with the liquid soap. Placethe deep ring of the flask in position and very carefully fill CELLULOID AS A DENTAL BASE. 67 with thin, well-mixed plaster. Place on the top, wash theoutside of the flask to remove all the surplus plaster, thenplace it under gentle pressure for half an hour, or until theplaster has thoroughly set. \\hen ready to separate, place the tiask in hot water fora few minutes,—the sections may then be readily separated;after this is done remove with a suitable instrument all thewax that is loose and easily detached, then pour a small Fig. r, stream of boiling water upon the case until every particleof wax is washed out. Care should be taken at the sametime not to disturb the tin-foil. Outlet-grooves or Gates.—There are a number ofmethods of cutting vents or gates for surplus material, butthe following, which is about as practiced by Dr. Evans,is probably the best. The upper half of the flask with pieceinvested is shown in Fig. 38. The wax has been washedout, exposing to view the roots of the teeth, platinum pins,etc., as ready to receive the base plate; the stippled tin-foilis clinging to the sides of the plaster, and the reverse 68 MECHANICAL DENTISTRY AND METALLURGY. matrix, a, from the elevated portion, a, on the other halfof flask. Fig. 39, b, indicates a portion of a cut away,illustrating the manner of forming vents; in this cut it isonly carried half around in order show the condition beforeand after preparing. Commence by cutting a deep grooveall around the piec
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Keywords: ., bookcentury1900, bookdecade1900, bookidman, booksubjectmetallurgy
