A Practical treatise on artificial crown- and bridge-work, and porcelain dental art / by George Evans.
- George Evans
- Date:
- 1900
Licence: Public Domain Mark
Credit: A Practical treatise on artificial crown- and bridge-work, and porcelain dental art / by George Evans. 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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![drill across the portion to be removed, and then cnt between the holes with a fissnre-bur or cornndum-disk, whieh will permit of easy removal of the part (Fig. 20). In preparing incisors and cuspids for gold collar crowns with porcelain fronts, where the pulp is to Ije ]jreserved, the labial surface and incisive edge should be ground down as much as possible without exposing the pulp or subjecting it to irritation; the palatal portion at an angle from the cervical border to the incisive edge, enough to level its prominences of contour and form a slight space between it and the antagonizing teeth (Fig. 21). Pulpless incisors and cuspids should be prepared by grinding the labial face to the gum^margin, Avith the palatal portion slightly projecting and squared off to the inner line of the root-canal. (See Fig. 22.) Bicuspids which are to have porcelain fronts are given the same general form (Fig. 23). Fig. 20. Ftg. 21. Fig. 22. Fig. 23. Fig. 24. Fig. 25. Bicuspids and molars with or without pulps, for all-gold crowns, should have as much of the natural crown left as possible, as it affords a more secure and more convenient attachment for the artificial crown than any other method (Figs. 24 and 25). It should be borne in mind, however, that unnecessarily cut- ting away the enamel and dentin of teeth ^^dth living pulps leaves them in an extremely sensitive condition, and is likely to result subsequently in some serious lesion of the pulp. Slight sensitive- ness, such as may be readily caused in excessive shaping, is relieved by drying the exposed dentin with hot air and applying carbolic acid two or three times as required. For the porcelain system, roots are usually ground level with the margin of the gum. The palatal portion in some cases is left a](https://iiif.wellcomecollection.org/image/b21223075_0061.jp2/full/800%2C/0/default.jpg)
