Mechanical dentistry : a practical treatise on the construction of the various kinds of artificial dentures ; comprising also useful formulae, tables, and receipts for gold plate, clasps, solders, etc., etc., etc. / by Charles Hunter.

  • Hunter, Charles.
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: Mechanical dentistry : a practical treatise on the construction of the various kinds of artificial dentures ; comprising also useful formulae, tables, and receipts for gold plate, clasps, solders, etc., etc., etc. / by Charles Hunter. 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.

    27/340 page 7
    hard before withdrawing ; but then it will be found in under-cut cases that it is impossible to withdraw the impression. If the dentist should ever experi- ence this, the best plan he can adopt for extract- ing the tray and material is to soften the latter by- means of warm water. Time must be allowed, and as the mouth becomes inured, the temperature of the water given may be increased, until the gutta-percha shall be softened sufficiently for with- drawal. To prepare this substance, heat it in water slightly under boiling point, and dry it before placing in the warmed impression tray. [c] Godiva, or Stent, Composition.—By means oi this composition impressions may be obtained with much more accuracy than with wax, though with less accuracy than with plaster. It does not, how- ever, demand so much from both operator and patient as the latter substance, and its inferiority is perhaps so little as to make it preferable in many cases where a plaster model is not easily obtained. Therefore we find the composition used generally for partial cases, while for edentulous uppers or lowers plaster is employed. It is softened in water of a somewhat higher tempera- ture than that required for wax; but the water should never be allowed to reach the boiling point, as over-heating destroys the material. The tray is filled in the manner already described. In taking the impression less force is required than for wax, and the material must be kept in position while setting by preserving a steady pressure upon the tray. When the composition has become sufficiently hard, the impression is withdrawn from
    digitised image 1
    digitised image 2
    digitised image 3