Specification of James Thom : fitting artificial teeth.

  • Thom, James.
Date:
1863
Catalogue details

Licence: Public Domain Mark

Credit: Specification of James Thom : fitting artificial teeth. Source: Wellcome Collection.

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    Thoms Improvements in Mounting or Fitting Artificial Teeth, from which the model was taken. In order to remedy this defect, and give the required accuracy to the artificial gum, I submit it to the following additional and corrective process, which I claim as contituting my said Inven¬ tion. Having trimmed the vulcanized indian-rubber and made any necessary 5 corrections thereto, I replace it (the teeth being imbedded in their proper positions) in the plaster mould, within a metal collar of a conical shape, which, by means of a screw press brings the parts of the plaster mould into close contact with each other, and with the vulcanized indian-rubber. While subjected to this pressure I heat it to about 220 degrees of Fahrenheit, which 20 so far softens the vulcanized indian-rubber as to cause it to conform itself strictly to the mould. In this state it is left to cool and harden; on being taken out it retains the true form of the mould, and accurately fits the mouth from which the original model was taken. Although I have described this process as being applied to vulcanized indian-rubber, it is also equally 15 applicable to any other vulcanized vegetable gum. In witness whereof, I, the said James Thom, have hereunto set my hand and seal, this Twelfth day of March, in the year of our Lord One thousand eight hundred and sixty-three. JAMES THOM. (l.s.) LONDON: Printed by George Edward Eyre and William Spoitiswoode, Printers to the Queen^s most Excellent Majesty. 1863.