A practical treatise on artificial crown- and bridge-work . 264 ARTIFICIAL CROWN- AND BRIDGE-WORK. The bridge is tlien placed on a slide in the muffle of a con-tinuous-gum furnace. It is sustained in position by insertingthe pins in holes drilled in the slide (Fig. 512) or by suspendingit with platinum wire between two pUitiimm posts inserted inthe slab. The bridge is then baked the same as continuous-gumwork. It is next fitted to the mouth. If any alterations arerequired they should be made, or if any imperfections in the bodyoccur the places should be filled in and the bridge again
A practical treatise on artificial crown- and bridge-work . 264 ARTIFICIAL CROWN- AND BRIDGE-WORK. The bridge is tlien placed on a slide in the muffle of a con-tinuous-gum furnace. It is sustained in position by insertingthe pins in holes drilled in the slide (Fig. 512) or by suspendingit with platinum wire between two pUitiimm posts inserted inthe slab. The bridge is then baked the same as continuous-gumwork. It is next fitted to the mouth. If any alterations arerequired they should be made, or if any imperfections in the bodyoccur the places should be filled in and the bridge again is then ready for insertion. Insertion.—When the l)ridge is supported by crowns alone, theposts are barbed and the bridge is then cemented on, the same asany other. If one end is supported by a porcelain crown andthe other by a bar, the filling on the bar end is inserted up to the Fio. position the bar is to occupy before fastening the post of the crownend, which is then cemented and the filling of the bar end com-pleted. If both ends are bars, both fillings are inserted up tothe position of the bars, the bridge inserted, and the fillingsfinished; the bridge being held by an instrument or the fingersuntil the l)ar ends are partly covered. When gold is used, the rubber-dam should first be applied,and the cervical portion of the teeth of the bridge pressedtightly into it to avoid any space being left after its removal andthe completion of the operation. When amalgam is used, the rubber-dam is not necessary. In Fig. 513, No. 1 is a third molar, pulp alive, with largefilling; No. 2 is a porcelain bridge; No. 3 is a first molar, pulpdead, with a metal bar entering the pulp-chamber. PORCELAIN BRIDGE- WORK. 265 In Fig. 514, No. 1 is a second molar, pulp alive, with a crownfilling of gold or amalgam retaining the bar ; Xo. 2 is a porce-lain bridge; Xo. 3 is a gold crown wit
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
