A manual of dental mechanics.

  • Coles, Oakley, 1845-1906
Date:
1873
Catalogue details

Licence: Public Domain Mark

Credit: A manual of dental mechanics. Source: Wellcome Collection.

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    as a material for taking impressions. With a little practice it is quite as easy to use as anything else, and infinitely more certain in its results. The best plaster only should be used, the water should just have the chill off, and to this must be added (before the plaster) a thimble- full of salt to a quarter of a pint of water. The plaster must be shaken in so that it does not fall into the water lumpy, and when there is enough of it to absorb the water it may be well mixed with a flexible knife, such as a steel palette knife, or better still, an india-rubber paper knife. The plaster will now be of the consistency of cream, and in this state it may be put into the tray and introduced into the mouth. The ordinary tray of the form shown in Figs. 1 and 2 may be used if the surface is well roughened. The great secret of saving your patient any discomfort is to have just the right quantity of plaster in the tray to suit the case, and then with a steady hand place it well back in the mouth before you let it touch the teeth. After this bring the free border of the back of the tray into contact with the posterior part of the palate, and then press upwards from behind forwards until the whole of the tray embraces the dental arch. Adopting this plan secures two points; you
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