Specification of Charles Goodyear : plates for artificial teeth.

  • Charles Goodyear
Date:
1855
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Charles Goodyear : plates for artificial teeth. Source: Wellcome Collection.

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    Provisional Goodyear s Improvements in the Plates of Artificial Teeth. thickness required, which layer of wax represents a model of the plate of caoutchouc which is afterwards to support the teeth and keep them firm in the mouth. When the crevices or cavities in or between the teeth are filled up with the wax, and the model of the plate completed, I take a plaster cast from the same, which cast I prefer should be enclosed in an iron rim or box for the 5 purpose of strength. This, when completed, together with the original plaster model (which I also prefer should be in an iron rim), form a mould which I use in the following manner :— After removing the wax from the cavities and crevices in or between the teeth, I readjust the teeth in their proper positions in the mould. I then fill 10 up the cavities and crevices and other vacant space in the mould with caout¬ chouc or gutta percha suitably prepared with sulphur, and after putting the several parts of the mould together and subjecting them to a sufficient degree of pressure, I cause the whole, that is to say, the mould containing the teeth with the caoutchouc or gutta percha, to be subjected to heat to convert the 15 compound into the hard product. To obtain a suitable colour, I mix with the caoutchouc or gutta percha Vermillion, oxides of zinc or iron, or any colouring substance which will stand the necessary degree of heat with the action of the sulphur. The best compound I believe to be one pound of india-rubber or gutta percha, or of the two combined in suitable proportions, with half a 20 pound of sulphur, together with a suitable quantity of colouring matter. I sometimes find it convenient to substitute the material for the masticators or teeth hidden from view, for which purpose the material is well fitted from its extreme hardness and durability. In order that the teeth may be more firmly attached to the plate, I prefer that they should be jagged or rough, or 25 have small cavities in the roots or parts imbedded in the plates. SPECIFICATION in pursuance of the conditions of the Letters Patent, filed by the said Charles Goodyear, junior, in the Great Seal Patent Office on the 11th September 1855. TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Charles 30 Goodyear, junior, of No. 42, Avenue Gabriel, Champs Elysecs, in the City of Paris, send greeting. WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters Patent, bearing date the Fourteenth day of March, in the year of our Lord One thousand eight hundred and fifty-five, in the eighteenth year of Her 35
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