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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![form a slight space between it and the antagonizing teeth (Fig. 19). Pulpless incisors and cuspids should be ground to the margin of the gum at the labial portion, and slightly above the margin on the posterior half (Fig. 20). Bicuspids which are to have porcelain fronts are given the same general form (Fig. 21). Bicuspids and molars with or without pulps, for all-gold crowns, should have as much of the natural crown left as possible, as it offers a form of attachment for the artificial crown which is more secure and more convenient than is attained by any other method (Figs. 22 and 23). For the porcelain system, incisor, cuspid, and posterior roots are usually ground level with the margin of the gum. The palatal Fig. 21. Ftg. 22. Fig. 23. Fig. 24. portion is favored in some cases by leaving it a triiie above the margin. The root-canal is shaped to the form of the post or pin so that it shall fit it tightly. For details see the articles on the Bon will and Logan crowns. The occluding edges or surfaces of antagonizing teeth should be removed sufficiently to allow ample space for the artificial crowns or to favor them in the act of occlu- sion. Corundum or composition wheels or points should be kept wet and cool in these and other operations in the mouth. Special Preparation of Badly Decayed Teeth or Hoots.—The tem- porary exposure of the end of a root or of the cervical portion of a crown for the purpose of facilitating or simplifying a crowning operation, especially in the adaptation of a collar or band, is ettected by inserting in the ])ulp-chamber or the root-canal a piece of gutta-percha large enough to admit of a portion being brought over against the investing membranes, to compress them for a day or more. Where a secure attachment for the gutta- percha cannot be obtained, a plug of wood should be inserted](https://iiif.wellcomecollection.org/image/b21223105_0039.jp2/full/800%2C/0/default.jpg)
