The Dental cosmos . of the pin in thin borax paste, and touchonly the contact line of the two wires with the borax. Put the leastbit of gold plate, or pure gold, or fine gold solder on the outer end ofthe post, hold in the flame of a Bunsen burner, and neatly unite thetwo wires without running any solder over their sides. This featheredpost should be found to fit closely the grooved socket, as in Fig. 4 ; 366 THE DENTAL COSMOS. resist every effort to rotate it, and yet permit withdrawal by a directpull. A thin platinum plate may be then fitted on the root end, aplate tooth backed, adjusted, an
The Dental cosmos . of the pin in thin borax paste, and touchonly the contact line of the two wires with the borax. Put the leastbit of gold plate, or pure gold, or fine gold solder on the outer end ofthe post, hold in the flame of a Bunsen burner, and neatly unite thetwo wires without running any solder over their sides. This featheredpost should be found to fit closely the grooved socket, as in Fig. 4 ; 366 THE DENTAL COSMOS. resist every effort to rotate it, and yet permit withdrawal by a directpull. A thin platinum plate may be then fitted on the root end, aplate tooth backed, adjusted, and hard-waxed on the plate and to thefeather-wire, the end of which should be left free as in Fig. 5, sothat it may be grasped by pliers to withdraw the crown and the platewithout disturbance, for investment and soldering in the usual 6 shows the completed crown, after mounting with sandarac var-nish, hot resin, copal varnish, or very thin cement. In favorable Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. •cases, under skilled hands, using exact instruments, the feathered post-crown will fit nearly moisture-tight, and the varnish will make itquite so. It is entirely practicable to fit the plain wire post to the simpleround socket, to fit the root-plate, to back and adjust the crown, andto remove and solder all together as usual ; then reinvest the crownin plaster and marble-dust, leaving the post exposed. To this solderthe feather of small wire, locating it so that its seat will be in thethickest part of the root. Then put it on the root, mark with a pencil Fig. 7. Fig. 8. Fig. 9. Fig. 10.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdentist, bookyear1890
