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.
67/268 page 67
![slopes ])ciiig such that the gum on the hiMal and pahital as[ieets will not interfere with nor l)e disturhed hv this preliuiinarv work, as the root end is not, in this operation, to he cut quite down to the gum. An Ottolengui root-reamer jS^o. 2 is then employed to bore out the root to receive the crown-pOvSt, which is of the same size and shape as the Logan crown-post for a central incisor. The sectional view (Fig. 112) sliows the relation of the reamer to the root. The new Richmond crown (Fig. 113) is then tried on the root (Fig. 114), and its position relative to the adjacent and occluding teeth noted. If the cutting-edge of the crown is to be brought out for alignment with its neighbors, the root can be drilled a little deeper, and the reamer pressed outward as it revolves to cut the lal)ial wall of the ca\'ity. Tlie palatal yooX- slope must then V)e filed to make the V correspond to the changed inclination of the crown. Fig. 110. Fig. 111. Fig. 112. Thus, by alternate trial and reaming and tiling, the crown may be fitted to the root and adjusted in its relations until the post has a close, solid l^earing against the labial and palatal walls of the enlarged pul})-chamber, and the crown-slo[)es are se})arated from the root-sloi)es by the thickness of a sheet of heavy writing- paper. This space can be accurately gauged, and the root-slopes conformed to the crown-slopes by warming the crown and put- ting on its slopes a little gutta-percha, so that an impression of the root-end may be taken, and the root-slopes dressed with a file until the film of gutta-percha proves to be of equal thinness on l)oth slo[>es. To permanently attach the crown. Dr. liichmond usually takes a thill, perforated disk of gutta-]ici-cha, ]iushes the post through](https://iiif.wellcomecollection.org/image/b21223105_0067.jp2/full/800%2C/0/default.jpg)
