The principles and practice of dentistry : including anatomy, physiology, pathology, therapeutics, dental surgery and mechanism / By Chapin A. Harris.

  • Harris, Chapin A. (Chapin Aaron), 1806-1860.
Date:
1881
Catalogue details

Licence: Public Domain Mark

Credit: The principles and practice of dentistry : including anatomy, physiology, pathology, therapeutics, dental surgery and mechanism / By Chapin A. Harris. Source: Wellcome Collection.

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

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    comes between the two roots just at the bifurcation. Mr. Snell em- ployed two pairs for the extraction of the lower as well as for the upper molars, in order, as he said, to have a hook to turn round the little finger, which he supposed must be on opposite sides of the instrument. But this, is rendered unnecessary by an improvement made by the author in 1833, which consists in having the handles of the instrument so bent that it may be as readily applied to one side of the mouth as the other, while the operator occupies a position to the right and a little behind the patient. By this improvement, the necessity for two pairs is wholly superseded; it, moreover, enables him to control the head of the j:>atient with his left arm and the lower jaw with his left hand, rendering the aid of an assistant wholly unnecessary. The shape of the instrument, as improved by the author, is shown in Fig. 138. It is now used by many hundreds of operators, who prefer it to any other instrument they have ever employed. When applied to a tooth, the handles turn toward the operator, at an angle of about twenty-five or thirty degrees. Without this curvature in the handles, the arm of the operator would often be thrown so far from his body as to prevent the proper control over the instrument. It is also important that the handles should be wide and accurately fitted to the hand. Fig. 138. side, with longer points in the centre of each blade of the beak. Fig. 139.