File:Denture making-2, Dental cosmos (1889).jpg

Identifier: dentalcosmos3118whit (find matches)
Title: Dental cosmos
Year: 1889 (1880s)
Authors: White, J. D McQuillen, J. H. (John Hugh), 1826-1879 Ziegler, George Jacob, b. 1821 White, James William, 1826-1891 Kirk, Edward C. (Edward Cameron), 1856-1933 Anthony, Lovick Pierce, 1877-
Subjects: Dentistry
Publisher: Philadelphia : S. S. White Dental Manufacturing Co
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

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Text Appearing Before Image:
roove in the teeth-halfof the flask, but, for reasons which will presently be given, it is pref-erable to cut the groove in the model-half as is shown in Fig. 3. Thegroove should be ample in width and depth, and should be beveledfrom its bottom to within one-sixteenth of an inch of the gum and 528 THE DENTAL COSMOS. palatine (or lingual) border. The like surface next the flask shouldbe slightly and evenly scraped to bevel it towards the groove, so thatthe two parts of the flask will come closer together than at first byabout the thickness of a sheet of No. 10 foil, the object being to com-pensate for the very thin septum of vulcanite which will usually bemade at the gum-border when the flask is finally closed, althoughby nice manipulation alone the septum may be reduced to the thin-ness of tissue-paper. It is however better to omit the scraping if itcannot be done with such evenness and delicacy that only a slightand uniform portion of the surface shall be removed. A vulcanite Fig. 2.
Text Appearing After Image:
scraper, shaped as shown in Fig. 4, is suited to the proper formationof the groove and the scraping of the plaster investment. Prior to the formation of the groove and the scraping just men-tioned there should be clearly in the mind of the manipulator theconviction that it pays to patiently wait for the hardening of theplaster investment before beginning to cut and scrape, because theparting edge of the groove at its gum-border should be as narrow asthe strength of the plaster will permit. It pays also to consider the character of the gum-outline, and soset the model in the flask and trim the investment that the surface FLASKING DENTURES FOR VULCANIZATION. 529 of the teeth-half shall slope up relatively to the gum-border, in orderthat the pressure of finally closing the flask shall not under anycircumstances jeopardize the thin porcelain blocks. An excellent Fig. 3.

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