. A manual of mechanical dentistry and metallurgy . e-blade of the same to go around theteeth on the palatal surface. Having carved the wax in this way, forming festoonsor exposing roots, as the case may recjuire, take a spiritlamp with a small flame and an air-bulb, which is betterthan a blow-pipe, and by gently puffing upon the waxsmooth away the rough, irregular projections while re-taining the larger undulations of the form desired. Weare now^ ready for the tin-foil and stippling. Take a strip6 66 MECHANICAL DENTISTRY AND METALLURGY. of No. 60 tin-foil, a little wider than the outside surf
. A manual of mechanical dentistry and metallurgy . e-blade of the same to go around theteeth on the palatal surface. Having carved the wax in this way, forming festoonsor exposing roots, as the case may recjuire, take a spiritlamp with a small flame and an air-bulb, which is betterthan a blow-pipe, and by gently puffing upon the waxsmooth away the rough, irregular projections while re-taining the larger undulations of the form desired. Weare now^ ready for the tin-foil and stippling. Take a strip6 66 MECHANICAL DENTISTRY AND METALLURGY. of No. 60 tin-foil, a little wider than the outside surfaceof the gum, and by commencing at one side with the broadend of the ivory-pointed carver, No. 3, burnish the tindown smoothly and uniformly over the entire surface,occasionally using the pointed end to work between theteeth, and the straight blade of carver No. i to cut thetin from around the teeth. The inside of the model istreated in the same way, except that a narrow, V-shapedpiece is cut from the tin before placing it on the palatal Fig. zT-. surface, to avoid folding, and that the entire outer edge ofthe plate is trimmed around. The stippling is done withan ordinary blunt-pointed excavator, or with a suitableengine plugger that will give a reacting blow. If donedelicately and closely, 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 hal
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Keywords: ., bookcentury1900, bookdecade1900, bookidman, booksubjectmetallurgy
