A practical treatise on mechanical dentistry . paraffin, and wax, or modeling compound, may~be used. When satisfaction in the occlusion is obtained, then thecase is returned to the model, and the waxing around the labialand buccal borders of the teeth completed. That portion of thetrial plate which covers the palatine surface is now removed, sothat the pins of the teeth will be nearly exposed, allowing the wax 366 MECHANICAL DENTISTRY. which is under the gum to remain. That the plate, after casting,.shall not be too cumbrous, the trial plate, which has been removed,must be substituted with two
A practical treatise on mechanical dentistry . paraffin, and wax, or modeling compound, may~be used. When satisfaction in the occlusion is obtained, then thecase is returned to the model, and the waxing around the labialand buccal borders of the teeth completed. That portion of thetrial plate which covers the palatine surface is now removed, sothat the pins of the teeth will be nearly exposed, allowing the wax 366 MECHANICAL DENTISTRY. which is under the gum to remain. That the plate, after casting,.shall not be too cumbrous, the trial plate, which has been removed,must be substituted with two thicknesses of French flower wax,cut carefully to the model, and pressed down closely with thefinger in such a manner that no wrinkles will appear to mar thebeauty of the work. Fig. 158 represents a case thus prepared. The dotted lines showthe borders of the thin wax. B, A, and C, represent nipples ofsolid wax, fixed to the posterior border and to the tuberosities, Aand C being the places of exit for the molten metal into the waste Fig. pockets, and B the place of entrance of the metal from the pouring-gain. The case is now transferred to the small brass flask, r, Fig. 159,.the sections of which have been welj oiled upon the inner surface,,to facilitate their removal from the investment. Either section isthen placed upon a plate of glass and plaster poured into it untilhalf filled. The model, as prepared, after being well saturatedwith water, is imbedded in this single section, allowing the teethand gums to remain uncovered. Set on the counterpart of the-flask and add more plaster along the posterior border until thenipples are reached or slightly covered. After this has set, theupper section may be removed and the surface of the plastercovered with a thin varnish or soapy water. Return the section. CAST METAL BASE. 367 and complete the investment. Fig. 159 shows the case thus madeready. After a proper time place the flask in hot water, that it may beseparated without in
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
