A practical treatise on artificial crown-, and bridge- work / by George Evans.

  • Evans, George, 1844-1942.
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: A practical treatise on artificial crown-, and bridge- work / by George Evans. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    crowns and caps (the latter held more firmly by the protruding ends of the pins) are generally removed in the impression; if not, they should be transferred from the mouth to it. The plaster is then varnished and oiled, and on the side containing the crowns a model is run, composed of equal parts of calcined marble-dust and plaster, to which a little sulfate of potassium is added. When the model has set, it is mounted with plaster on an articulator, and the other side of the colored plaster impres- sion giving the articulation is run with plaster and the opposite section of the articulator adjusted. When the impression plaster is removed (an operation which is greatly facilitated by its having been colored with carmine), a correct model and articulation of the case will be found, with the crowns and caps in exact posi- tion as in the mouth (Fig. 274). Fig. 274. Another method is to first take the articulation in wax and then the impression in an impression-tray with plaster, and make a model and articulation from them in the usual manner Dr. Melotte's method is to place a piece of impression com- pound m the space between the crowns to be occupied by a bridge, and occlude the teeth. The compound is then chilled removed trimmed, and readjusted until it accurately fits the space when it is placed in position and an impression is taken with plaster. When the impression is removed, iron pins to act as dowels are placed in the portions representing the natural