A practical treatise on artificial crown- and bridge-work . THE GOLD SEAMLESS CAP CROWN. 107 the artificial crown can then be proceeded with. Where thenatural crown is very badly decayed or broken down and themethod just described is not practicable, the portion of thenatural crown or root remaining should be shaped and preparedto receive an artificial crown. Then the form of the cervix isascertained with a wire as described on page 86, and an impres-sion of the parts taken in wax, and the wire form, the twistedends having been shortened, is carefully adjusted on the wax atthe cervical line. T
A practical treatise on artificial crown- and bridge-work . THE GOLD SEAMLESS CAP CROWN. 107 the artificial crown can then be proceeded with. Where thenatural crown is very badly decayed or broken down and themethod just described is not practicable, the portion of thenatural crown or root remaining should be shaped and preparedto receive an artificial crown. Then the form of the cervix isascertained with a wire as described on page 86, and an impres-sion of the parts taken in wax, and the wire form, the twistedends having been shortened, is carefully adjusted on the wax atthe cervical line. The plaster model, when made, will show thewire slightly imbedded in the plaster. The plaster should betrimmed to the inner edge of the wire, as that represents theexact form of the root (Fig. 205). Another method is to encircle and adapt to the form of theroot a strip of annealed copper, No. 35 standard gauge, about Fig. 205. Fig. one-eighth of an inch wide/Yrhe copper is then removed, the. ?^ndgJi£^tfrLgjifl:^*^ir>ilI^fl wHh ^n aHA™.^ the copper adjusted on the root, and tin- ends cemented with a warm impression is next taken with plaster, in which the copperband is removed in position. A model made from this impres-sion, after the copper is removed, presents the exact form of theroot. From a bite taken in wax a plaster articulation is then madeto the model. A hole is then drilled in the center of the formof the root on the model to be crowned. In this hole, and overthe end of the root, a ball of soft plaster, slightly colored withcarmine, is placed, and the teeth of the articulation, coveredwith tin foil, closed on it. This, on separation, gives the outlineof the form of the grinding-surface for the crown. The sides of
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherphila, bookyear1889
