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.

    286/1222 (page 260)
    When a torsional bend in the clasp is required, as in turn- ing the angles of a bell-crowned tooth, it can be accomplished by substituting a pair of pliers for the fingers for holding the unadapted strip, the hawkbills being applied to the adapted portion, while round or flat beak or another pair of hawkbill pliers can be used on the unadapted portion, as the contour _ of the surfaces requires. To illustrate the steps as outlined, the adaptation of a clasp to an upper first bicuspid will be described. The two ends of the clasp will terminate mesially. The strip of concaved clasp metal is applied to the mesio- buccal angle of the axial surface of the tooth and the areas not in contact noted. These are corrected to the crest of the TON Fig. 138.— Clasp Adapted to the First One- Fig. 139.— Clasp Adapted to the Buccal Sixth of Tooth Periphery Surface of the Tooth buceal ridge, usually representing a linear distance of about three-sixteenths of an inch. Adaptation should then be se- cured between the buccal ridge and the disto-buccal angle in like manner. Then the turn is made around this angle and adaptation secured across the distal surface, to the disto- Fig. 140.— Clasp Adapted to Buceal and Fig. 141.— Peripheral Adaptation of Distal Surfaces of Tooth Clasp Completed lingual angle. From this point the strip is bent against the lingual surface to the center of this side. The final step con- sists in turning the mesio-lingual end of the strip into place. Thus the process. of peripheral adaptation of a clasp consists of five, or, in certain cases, seven distinct steps where the terminal ends of the clasp require special adaptation in the embrasures. SECURING SurFacE ADAPTATION OF THE CLASP To Dtr Witrn Hammer . Peripheral adaptation refers to the bending of the strip into partial band form, so that it embraces the periphery of