A practical treatise on artificial crown- and bridge-work . crown of pure gold, or gold lined with platinumas a precaution against melting, is shortened suf-ficiently to represent the absent coronal sectionof the tooth, and wnth a corundum-disk the orifice « V- of the anchorage cavity is formed. A shell of thin platinum ofthe size and shape of the anchorage cavity is then inserted andcemented with wax on the inside of the crown. The crown isthen invested and filled with 18-carat gold solder, which shouldbe cut into small pieces, and be placed successively in the crown Fro. and melted by
A practical treatise on artificial crown- and bridge-work . crown of pure gold, or gold lined with platinumas a precaution against melting, is shortened suf-ficiently to represent the absent coronal sectionof the tooth, and wnth a corundum-disk the orifice « V- of the anchorage cavity is formed. A shell of thin platinum ofthe size and shape of the anchorage cavity is then inserted andcemented with wax on the inside of the crown. The crown isthen invested and filled with 18-carat gold solder, which shouldbe cut into small pieces, and be placed successively in the crown Fro. and melted by maintaining a uniform heat with the large flameof a blow-pipe. The base of the crown is next ground level andaccurately fitted to the cap and articulated to the antagonizingteeth. It is then clamped in position to the cap, the pivots ofwhich are protected with investing material (Fig. 321), andsoldered, making a perfect joint. This is an easy method ofconstructinsr an otherwise dilficult form of crown. SPECIAL PROCESSES AXD APILIASCES IX liRIDOE-WORE. 1(35 Fig. 322 illustrates a lu-idge sui>portefl bv a 1 tar-anchorage ina solid gold crown on the roots of a molar and a shell crown ona cuspid. Cornurtimi Bonds or Bars for Brii/;/i.^., which obviate the removalof crowns of intervening natural teeth between the sections of aprojected bridge, are formed l)v passing a heav}- band of oval- FiQ. 322.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
