A practical treatise on artificial crown- and bridge-work / By George Evans. With 500 illustrations.
- George Evans
- Date:
- 1888
Licence: Public Domain Mark
Credit: A practical treatise on artificial crown- and bridge-work / By George Evans. With 500 illustrations. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![GOLD COLLAR CROWNS WITH PORCELAIN FRONTS. INCISORS AND CUSPIDS. This style of crown for incisors and cuspids, as originally made by Dr. C. M. Richmond, and with which his name has become associated, consisted of a cap for the root, formed of a band of gold capped with platinum on which was soldered a tooth with a slot in the center between the pins. Through this slot a screw passed which entered into a cylinder previously screwed and cemented into the root-canal. The form of gold collar crown in general use at present is, in principle, the same as what has been known in dentistry as a gold pivot tooth, with the addition of a gold collar for the root, and having the advantage of oxyphosphate for its cementation. These improvements, however, enhance its value as a crown, and materially change the process of its construction. In miaking an incisor or cuspid crown of this style, the collar, having l)een formed, is trimmed even with the surface of the end of the root. With the collar in position on the root, a corundum-wheel is passed over the labial edge, along the margin of the gum, to level the gold with the root and render it invisible when the crown is finished. The work will then ]:)resent the appearance shown in Fig. 154. The cap is made by adapting the surface of a very thin piece of platinum plate to the Jower edge of the collar, and uniting them with solder in the flame of a lamp (Fig. 155). The quan- tity of solder used must be very small, and it should be placed on the platinum outside of the collar, as otherwise it will flow over the inside of the collar and interfere with the tit of the cap. The platinum is then trimmed to the collar, and the cap adjusted on the root. The labial section of the surface of the cap is](https://iiif.wellcomecollection.org/image/b21223105_0084.jp2/full/800%2C/0/default.jpg)
