Vulcanite and celluloid : instructions in their practical working for dental purposes / by S. Eldred Gilbert.

  • Gilbert, S. Eldred.
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: Vulcanite and celluloid : instructions in their practical working for dental purposes / by S. Eldred Gilbert. Source: Wellcome Collection.

Provider: This material has been provided by the University of Toronto, Harry A Abbott Dentistry Library, through the Medical Heritage Library. The original may be consulted at the Harry A Abbott Dentistry Library, University of Toronto.

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    Modelling Composition.—E'ext to plaster, this is probably the best material for impressions. To use it to the best advantage, water should be heated in a shallow vessel until it reaches the boiling point. It should then be removed from the flame and the composition placed in it, allowing it to remain until thoroughly softened, by which time the water will have lost some of its heat, and the material will not be too hot to handle when taken out of the water with the spatula. Pass the impression cup over a flame until it is heated suflaciently to prevent the hardening of the material when brought in contact with it. Build up the composition to approximate the form of the arch; then proceed as with w^ax until the surface begins to harden slightly. Press it around the outside of the ridge, applying also a slight pressure with the index finger upward and forward to that part which overhangs the back of the tray. Allow it to cool still more, and at the end of another minute or so it may be carefully removed, caution being used not to draw in the sides by pressure against the corners of the mouth. Plunge the impression in cold water at once, letting it remain until hard. Before filling it with plaster wet the surface. A smooth, glossy model, with a clear repro- duction of each line in the mouth, will be the result. To remove the impression from the cast, heat the water as before; place the cast and impression in it until the compound is softened, when it is easily detached. In most eases ]^o. 2 Modelling Composition will meet all the requirements. Plaster of Paris {Sulphate of Calcium).—This I consider to