Specification of Urial King Mayo : artificial teeth and plates.

  • Mayo, Urial King.
Date:
1871
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Urial King Mayo : artificial teeth and plates. Source: Wellcome Collection.

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    Mayo's Improvements in the Preparation of Artificial Teeth. but one-thirtieth of the space in a solid state to what it does as a liquid or in the state of collodion. This property of the prepared cotton pre¬ vented it from being successfully used. In the United States of America attempts to so utilize it have been made by mixing it with mineral 6 or other matters, but the mixture was rendered too brittle and was objectionable in other respects. The hard collodion has been obtained and subsequently broken up, re-dissolved, and afterwards pressed into a mould containing the tooth or teeth. As the material hardened it would shrink so much as to require great force to keep it in connection 10 with the teeth, they often being broken by it; besides though dry or hard on the exterior the interior of the plate often remained for months in a soft state, being subjected to constant shrinkage, all of which was fatal to it for its intended purpose. In carrying out my Invention I do not press the material in a mould 15 upon or against the tooth or teeth placed therein in order to fix it ov them to it and give shape to the material, but I condense the material in a mould and indurate the moulded mass so as to reduce it to a shape closely approximating to such as may be desirable, as, for instance, I make it for an upper jaw plate of the form as shown in Eigures 4 and 5, 20 or for a lower jaw plate as shown in Eigures 6, 7, and 8. In case of the blank for the upper jaw plate I make it to cover such part of the jaw or of such and the roof of the mouth as may be desirable. The blank for the lower jaw plate is to be of the form required and to have grooves a, b, disposed in it exteriorally in manner as shown, such 25 being to serve as supports to the teeth and their backing.^ In preparing the plastic material for being moulded I take, for instance, one pound of the soluble cotton (by soluble cotton I mean cotton prepared by sulphuric and nitric acid in a manner well known for the purpose of making collodion of such cotton by dissolving it in 30 ether and alcohol or some other suitable substitute) and reduce it to a pulpy state by means of about three pounds of sulphuric ether and twelve ounces of alcohol. It is to be borne in mind that I do not reduo©' the mass to a Kquid but simply to a pulpy or plastic state. In such a state it will shrink to about one-fourth of its bulk in drying. 35 Generally speaking before being fit for use the material has to be strained or otherwise properly treated so as to deprive it of extraneous matters. To accomplish this it may be driven through a sieve or sieves by pressure applied to it; next it is to be forced or condensed under
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