A practical treatise on artificial crown- and bridge-work . as much as possible in size, and additional investing material,composed of two parts marble-dust and one of plaster, applieduntil all of the bridge is covered except the space along thebackings and crowns where they are to l)e united in the solder-ing. To prevent fracture during the process of soldering, which CONSTJWCTION OF BRIDGE-WORK. 159 Tiiicrlit readilv occur tVoiu contraction in so large an investment,an Iron wire or a narrow horse-shoe shaped strip of sheet ironshould be phiced in the investment so as to encircle the teethand
A practical treatise on artificial crown- and bridge-work . as much as possible in size, and additional investing material,composed of two parts marble-dust and one of plaster, applieduntil all of the bridge is covered except the space along thebackings and crowns where they are to l)e united in the solder-ing. To prevent fracture during the process of soldering, which CONSTJWCTION OF BRIDGE-WORK. 159 Tiiicrlit readilv occur tVoiu contraction in so large an investment,an Iron wire or a narrow horse-shoe shaped strip of sheet ironshould be phiced in the investment so as to encircle the teethand crowns about one-fourth of an inch from their exterior sur-^face (Fii;. 307). In the spaces between the backings pieces otcrold or^platinum plate or wire, about one-eighth of an , are placed lengthwise, and the joints well soldered with20-carat gold solder. The soldering is best done with a gas blow-pipe on a^piece of charcoal with a concave depression. When thebridge is removed for finishing, the joints of the backings andcrowns are finished wit
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
