Excerpt from The Dental Register, 1873, Vol. 27
Next in order we will consider brie¿y the taking of impres sions. Formerly many materials were used for this purpose, and none were entirely subservient to the requirements. Yet plaster of Paris approximates more closely every e... xigency than any other known substance, and for this reason is in almost universal use. It is not, however, entirely free from objections; the most noticeable is its shrinking in process of crystalization. In using it for impressions I use salt Water, which causes it to solidify much quicker. I use as little plaster as I can, having previously prepared a thin film of wax, attached to the posterior palatine border of the cup, to prevent plaster escaping posteriorly. In introducing the cup, previously directing patient to hold the head erect, to be ready, and when introduced to breath through the nose, I would pre fer my patient to be seated in a.low chair. The cup when in troduced should be pressed upon the posterior part and the anterior gently brought in place, which will press all surplus to the front, when sufficiently hard to remove.
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