Prosthetic dentistry / by James Harrison Prothero.

  • Prothero, James Harrison.
Date:
1916
Catalogue details

Licence: Public Domain Mark

Credit: Prosthetic dentistry / by James Harrison Prothero. Source: Wellcome Collection.

    104/1222 (page 78)
    is introduced in the form of rather a wide roll extending from labial flange, over vault portion, to distal margin of tray. The impression, when taken, will not extend out to the buccal surfaces of the teeth, nor will it usually be necessary to include them in the preliminary impression, since the tray flange is usually wide enough to support the plaster against the buccal surfaces of the teeth and the adjacent gingival mar- gin of the border as well. However, if it is necessary to secure an impression of the entire buccal surfaces of the border, the tray flange can be increased in width by spreading the prelimi- nary impression material over the entire tray. Criass 4 ANTERIOR AND POSTERIOR TEETH ON ONE SIDE MISSING; THE OPPOSITE POSTERIOR TEETH IN PLACE The same general style of tray can be used as in the pre- ceding class. The compound should be thicker on the side where the teeth are missing.. The preliminary impression is obtained, trimmed and enlarged at the proper points, and the final impression secured in plaster. Crass 5 ¢ TEETH AND SPACES ALTERNATING WITH MORE OR LESS ~ REGULARITY Teeth and spaces alternating, in impression work, usually requires that the impression will be broken into several pieces in order to effect its removal. Such a case always requires special care to secure accurate results. The usual routine described for the preceding cases is applicable here, although with a deep-sided tray of the Angle type, oiled inside to prevent the plaster adhering, will often times prove more satisfactory than the combined impression. In fact, the Angle tray can be used for most any of the partial cases described, either with plaster alone, or combined with wax or modeling compound. The one serious objection to its use is due to the very wide flange, preventing ease of finger adaptation of the impression material. Crass 6 AN OCCASIONAL MISSING TOOTH These cases are handled in a similar manner to the pre- ceding class. A preliminary, compound or wax, impression is taken, enlarged and used as a receptacle for the plaster.