Specification of John Henry Johnson : artificial dentures.

  • Johnson, John Henry.
Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Henry Johnson : artificial dentures. Source: Wellcome Collection.

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    Specification. A.D. 1871.—N° 3178. 3 Johnson's Improvements in Artificial Dentures. varnish may be slightly colored to graduate the tint already existing in the base. The improved composition for bases consists of oxychloride of zinc, made by mixing together oxide and chloride of zinc in such proportions 5 as to form a plastic mass, and so coloring the same that the composition will represent as nearly as possible the natural color of the gum. The teeth are mounted on wax or gutta percha in the usual manner, and are embedded in the plaster of a sectional mould, and after the removal of the wax the plastic material is introduced in its place and 10 retained within the mould until the material is hardened, the whole process being conducted without the application of heat. Pinely powdered ground silex, or other equivalent material, may be added to the oxy¬ chloride so as to give body and additional strength to the same. In connection with the improved oxychloride base it is preferred to 15 use single plain teeth, and to form the imitation of the exposed portion of the gum on the base by tinting if necessary and enamelling the same, as herein-before described. The oxychloride may form a portion only of the base; it may for instance be backed with metal, or the greater portion of the base may consist of metal to which the teeth are united 20 by oxychloride, which forms the imitation of the exposed portion of the gums. Prior to the application of the enamel to the oxychloride base the latter is coated with a solution of gum sandarac or other equivalent resinous gum, which acts as a medium for causing the adhesion of the 25 enamel. The essential features of this Invention are:— Pirst. A peculiar artificial denture having a base wholly or partly of composition, and a mode of imitating the natural gum, formed of and composing a part of the said composition. 3Q Second. An artificial denture in which plain single teeth are embedded in a composition base of which a portion is made in imitation of the exposed portion of the natural gums. Third. An artificial denture the base of which is composed wholly or in part of oxychloride with or without other ingredients.