Specification of Matthew Cartwright : mouth-pieces for dental and other purposes.

  • Cartwright, Matthew.
Date:
1860
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Matthew Cartwright : mouth-pieces for dental and other purposes. Source: Wellcome Collection.

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    Cartwright's Improvements in Mouth-pieces for Dental and other Pm poses* firmly held together; the flask should then be placed in a vice, 01 otherwise firmly fixed, as by a powerful screw opposite to the nozzle of a cylinder, in which the vulcanite is heated, care being taken to place the nozzle well into the hole of the lid. The vulcanite, which may be softened in the cylinder by means of steam, is then driven by means of a piston attached to a screw, 5 worked by the hand through the nozzle of the cylinder into the flask, until the vulcanite comes out of the escape gates. The operator should then pause for a minute, and then again proceed to force, by means of the screw, more vulcanite into the flask, which will be found capable of receiving it without any equivalent quantity exuding from the escape gates. When the flask will 10 not receive any more, the surplus vulcanite should be pinched off at the escape gates, and two small screws made to fit such escape gates screwed in. The operator should again proceed to force in as much more vulcanite by the cylinder or piston screw as the cavity will admit, so that the vulcanite may be firmly compressed into the mould. The flask is then allowed to remain a few 15 minutes to cool, so that the vulcanite may get partially set in the cavity. The flask is then to be removed from the nozzle of the cylinder, and a metal nut or stopper placed to fill up the hole in the lid. The flask is then removed from the clamp and screwed into a bridle clamp, which is brought over the nut or stopper. The vulcanite is then hardened by placing the flask with its 20 contents on an ordinary steam or dry heat vulcanizer, and keeping up the heat at a temperature of three hundred and fifteen degrees for about two hours. After the flask is taken out of the vulcanizer it is allowed to cool, and the clamp may then be removed, and the parts separated in the usual way. The vulcanite ends communicating with the escape gates and hole in the lid must 25 next be cut off even with the surface of the mouth-piece, and at these spots not covered with gold, holes may be drilled, so as to form small cavities, which may be filled with fresh vulcanite, or Jacob’s gutta percha ; if the former, the mouth-piece must again be placed upon the model and put in the digester, and the vulcanite while in a hot state covered with crystal gold. If the latter be 30 used, it may be melted into the cavity by means of a hot iron, and the surface covered with crystal gold. Another and more simple mode of covering the mouth-piece with the gold leaf, crystal gold, platina, or tin foil, is as follows :—After having formed the wax mouth-piece and teeth upon the model, the same is placed in the lower 35 half-flask, and fixed therein with liquid plaster. The gold leaf, crystal gold, platina, or tin foil is then nicely adapted upon and over the upper side of the wax mouth-piece, and after soaping or oiling the plaster in the lower half-flask the upper half-flask may be placed upon the lower half, and the flask filled up