The Dental cosmos . Ordinary backings with facings, and abutments with cap backings. Fig. Stationary bridge. removable, and mixed. The first is thesimplest, and when set is like the ordi-nary type of bridge in not being remov-able. The second form introduces a newfeature, in that everything but the porce-lain crowns is removable at will. Bridgesof the third group involve simply the ad-dition of any other crown or metallicwork to either of the preceding forms. The methods of work do not differmuch from those now employed, but ofcourse certain variations are necessary. must be used, owing to
The Dental cosmos . Ordinary backings with facings, and abutments with cap backings. Fig. Stationary bridge. removable, and mixed. The first is thesimplest, and when set is like the ordi-nary type of bridge in not being remov-able. The second form introduces a newfeature, in that everything but the porce-lain crowns is removable at will. Bridgesof the third group involve simply the ad-dition of any other crown or metallicwork to either of the preceding forms. The methods of work do not differmuch from those now employed, but ofcourse certain variations are necessary. must be used, owing to the fact that thebridge remains on the cast during thesoldering. Thirdly, the crowns must be fitted withcap backings as previously described(Fig. 6), except that the soldering is notdone until the whole bridge is thus soldered, the ordinary backingwith the facings, becomes continuous withthe cap backings with their pins, whilethe latter are firmly united to the hollowpin crowns. The bridge is now soldered BEST.—A SYSTEM OF CROWNING AND BRIDGING, ETC. 1249 in the usual manner
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