. A manual on extracting teeth, founded on the anatomy of the parts involved in the operation; the kinds and proper construction of the instruments to be used; the accidents liable to occur from the operation, and the proper remedies to retrieve such accidents . materially insize, and as the central and lateral incisors and thecuspidati, in the same individual ahvays are of differentsizes, it is obvious that no one instrument, nor anytwo or three instruments can thus accurately fit allthe teeth to which they are to be applied; but bycarefully fitting one instrument to a tooth about theaverage,
. A manual on extracting teeth, founded on the anatomy of the parts involved in the operation; the kinds and proper construction of the instruments to be used; the accidents liable to occur from the operation, and the proper remedies to retrieve such accidents . materially insize, and as the central and lateral incisors and thecuspidati, in the same individual ahvays are of differentsizes, it is obvious that no one instrument, nor anytwo or three instruments can thus accurately fit allthe teeth to which they are to be applied; but bycarefully fitting one instrument to a tooth about theaverage, or a little above the average size, andanother to one a little below that size, the two canbe made to answer, very well, in all ordinary blades or jaws, should also be set so farapart at the joint, that when their ends have firmlygrasped the neck of the tooth, they shall not impingeupon and crush their crowns ; nor in doing this,should the blades be much if at all curved, but they INSTRUMENTS FOR EXTRACTIXU TEETH. 109 should rather approximate each other in direct linesfrom their joint to their points, otherwise they willact to some extent as excising forceps, and are there-fore liable to break the tooth, instead of extract-ing it. Fig. The comparative length of the blades and handleof the instrument is also of some importance. Ifthe blades are too short, in proportion, the leverageof the handles will be so great, that a sufficientamount of force to extract the tooth, will crush it;and on the other hand, if the blades are too long, anextra amount of force beyond what is necessary toextract the tooth, will be required, by the grip ofthe hand, to prevent the instrument from slippingfrom the tooth, while, of course, the tractile force of10 110 INSTRUxMENTS FOR EXTRACTING TEETH. either instrument would be precisely the same, pro-vided the entire length of each of the two instrumentswas the same. Therefore, a proper medium shouldbe observed in this regard. This pri
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