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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    A.D. 1855.-N° 577. Specification. f. i Goodyear s Improvements in the Plates of Artificial Teeth. 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 5 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 10 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 15 have small cavities in the roots or parts imbedded in the plates. Having thus described the nature of the said Invention, I have only further to state, that in thus making improvements in artificial plates and teeth of india-rubber and gutta percha compounds, combined with sulphur, that whilst in the moulds I cause the materials and the moulds to be subjected to heat 20 for about six hours, and in doing so I gradually raise the heat up to about 230° of Fahrenheit, say, in about half an hour, and then, unless there be a con¬ siderable quantity of foreign matter present, the heat may be raised as quickly as maybe to about 295° of Fahrenheit; otherwise I raise the heat more slowly, and retain the compound at about that temperature for the remainder of the 25 six hours, and then allow the whole to cool down, when the process will be completed. The artificial plates or teeth thus formed will then be ready to be trimmed and fitted. I claim the above-described manufacture of artficial plates and teeth. In witness whereof, I, the said Charles Goodyear, have hereunto set my 30 hand and seal, this Eighth day of September, in the year of our Lord One thousand eight hundred and fifty-five. CHAs GOODYEAR, Jr. (L.s.) Witness, Fanny Goodyear. q k LONDON : Printed by George Edward Eyre and William Spottiswoode, Printers to the Queen's most Excellent Majesty. 1855.
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