A practical treatise on mechanical dentistry . is a very frequent demand. It is for supplying the loss of the firstmolar and bicuspids. If the cuspid is intact, the anterior end ofthe bridge may be attached by a strong band of clasp metal passing 58o MECHANICAL DENTISTRY. around this tooth, partly beneath the margin of the gum, so as topresent the least possible exposure. If, as is frequently the case,there is extensive decay, it will be best to excise the remaining por-tion of the tooth and replace it with an artificial crown as shown inthe illustration. The latter method the editor believes
A practical treatise on mechanical dentistry . is a very frequent demand. It is for supplying the loss of the firstmolar and bicuspids. If the cuspid is intact, the anterior end ofthe bridge may be attached by a strong band of clasp metal passing 58o MECHANICAL DENTISTRY. around this tooth, partly beneath the margin of the gum, so as topresent the least possible exposure. If, as is frequently the case,there is extensive decay, it will be best to excise the remaining por-tion of the tooth and replace it with an artificial crown as shown inthe illustration. The latter method the editor believes to be thebetter practice, even where the cuspid is a vital tooth. A gold capis then made for the second molar. If this tooth is decayed it willonly be necessary to remove the decay, and the cement which is usedfor setting the bridge will make the most perfect filling material be-neath the gold cap. The intervening molar and bicuspid crowns aremade in the following manner: The porcelain faces are backed with Fig. gold or platinum and the tips ground squarely off. Zinc pattern dies,an assortment of which should be made from the grinding surfaces ofmolars and bicuspids, are used for swaging from pure gold a tip orcap for the protection of the porcelain face; for without this protec-tion the porcelain would be almost certain to be broken. The con-cave surface of these tips is filled by melting coin-gold into surface is then ground smooth and fitted to the squared surfaceof the porcelain face and waxed in position. Triangular pieces ofplatinum are then cut of the proper size to fit the sides of the tooth,waxed in position, and the whole invested, leaving the back open,which is filled with coin-gold. The several surfaces of a tooth thusprepared are shown in Fig. 532. BRIDGE DENTURES. 581 These teeth are then fitted into position in the bridge, as previ-ously described. Fig. 534 shows the completed work in the mouth. Where only one molar or bicuspid is lost, sufficient
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