. A manual of mechanical dentistry and metallurgy . as possible, in parallel lines, so that in the adjustment of the finished piece the crowns will move readily to their place. The simplest and no doubt the most practical method of bridge-work is that first described by Dr. J. L. Williams. CROWN- AND BRIDGE-WORK. 187 Two or three typical cases will Ije described which will besufficient to present the subject. Bridging from Cuspid to Cuspid.—V\g. 160 shows amodel of a mouth in which the sufierior laterals and centralshad been extracted. The cuspid teeth were badly decayed,with exposure of the p
. A manual of mechanical dentistry and metallurgy . as possible, in parallel lines, so that in the adjustment of the finished piece the crowns will move readily to their place. The simplest and no doubt the most practical method of bridge-work is that first described by Dr. J. L. Williams. CROWN- AND BRIDGE-WORK. 187 Two or three typical cases will Ije described which will besufficient to present the subject. Bridging from Cuspid to Cuspid.—V\g. 160 shows amodel of a mouth in which the sufierior laterals and centralshad been extracted. The cuspid teeth were badly decayed,with exposure of the pulps. The first step is the removalof these pulps. The crowns are then fitted as already de-scribed and placed in position. An impression is taken inplaster, the crowns remaining embedded on its impression is varnished and oiled, and a model of Fig. investing- material poured. After this has hardened theimpression is carefully cut away, and we have a model ofthe mouth with the crowns in position. A bite is takenand the articulation secured in the usual manner. The re-maining crowns, having been backed, are fitted, and theface of the work embedded in investing material. The whole piece is now united at the back by soldering,and when finished presents the appearance shown at i88 MECHANICAL DENTISTRY AND METALLURGY, Fig. 162 slicnvs a mcxlel of the mouth after the hridgehas been cemented in place. A Lateral Bridge.—Fig. 163 is an illustration of a pieceof this work for which there is a very frequent demand. Itis for supplying the loss of the first molar and , as is frequently the case, there is extensive decay in thecuspid, it will be best to excise the remaining portion of thetooth and construct an artificial crown as shown in the illus-tration. A gold cap is then made for the second this tooth is de
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