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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![THE GOLD SYSTEM. CHAPTER V. PORCELAIN AND GOLD CROWN WITHOUT A COLLAR. The root of a cuspid will be taken as a typical case to illustrate the construction of this style of crown. The end of the root is prepared the same as for a porce- lain crown (Fig. 137). The root-canal is then uniforndy en- larged a reasonable distance up, with a drill Avliicli will tightly fit the opening. Into the canal, gauging its full diameter, is Fig. 137. Fig. 139. Fig. 140. Fig. 141. fitted a piece of iridio-phitiiitini ^\'ire, tapered off to a point, so that by introducing it far up the canal greater strength can l)e obtained, and the root rendered less liable to longitudinal fracture from pressure in a f)rward direction. A ]iiece of }tlatiiuim plate, a trifle larger than the end of tlie root, of about Xo. 30 U. S. standard gauge, with a hole ])unt'hed in its center, is then slipped on the post, which it nuist fit tiglitly (Fig. 138). When the post is adjusted firndy in the canal, the ]tlatimim plate is pressed down on the root, and burnished into the orifice](https://iiif.wellcomecollection.org/image/b21223105_0077.jp2/full/800%2C/0/default.jpg)
