A practical treatise on mechanical dentistry . gold plate, which lies over the upper right first molar die. A suc-cession of blows on the hub, with a four-pound smooth-faced ham-mer, will drive the plate into the, die, and at the same time spreadthe hub metal from the center to its circumference in such a man- Fig. ner that the plate will be perfectly struck up with the least possiblerisk of being cracked. The flattened hub is seen in Fig. 475, whichalso shows at D the obverse of the struck up hub, and at E thecameo of the struck up plate, having every cusp and depressionsharply defined.
A practical treatise on mechanical dentistry . gold plate, which lies over the upper right first molar die. A suc-cession of blows on the hub, with a four-pound smooth-faced ham-mer, will drive the plate into the, die, and at the same time spreadthe hub metal from the center to its circumference in such a man- Fig. ner that the plate will be perfectly struck up with the least possiblerisk of being cracked. The flattened hub is seen in Fig. 475, whichalso shows at D the obverse of the struck up hub, and at E thecameo of the struck up plate, having every cusp and depressionsharply defined. 540 MECHANICAL DENTISTRY. The counter-die plate. Fig. 472, is made of a very hard castmetal, which will admit of the striking up of many crown-plates bythe means and methods described, if the crown-plates be not toothick and stiff. Of course, they should be annealed before theyare placed over the die. In careful hands the die-plate should giveclear cusp definitions after years of use. The peculiar action of the hub in forming first the center of thecrown-plate, and spreading from the center outward, as the hub isshortened under the hammer, until the die is overspread by the plateand hub, with the result shown in Fig. 475, is an essential featureof this process for obtaining easily and quickly the superior styles
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
