. 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 . l established and known that a definitedescription can hardly be deemed necessary, or anysuggestions on that head further than, that they aregenerally made more crooked than is either neces-sary or convenient, and as each forcep is always usedfor its own definite side of the mouth, they afi*ord afirmer and securer hold for the hand if
. 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 . l established and known that a definitedescription can hardly be deemed necessary, or anysuggestions on that head further than, that they aregenerally made more crooked than is either neces-sary or convenient, and as each forcep is always usedfor its own definite side of the mouth, they afi*ord afirmer and securer hold for the hand if one handle isbent around the little finger, than if both are madestraight. But as correct adaptation—accuracy offit—of the instrument to the tooth, both for efficiencyof action, and to avoid, as much as possible, thebreaking of the teeth or other accidents, is a con-sideration of prime importance, I shall describethis part of it somewhat minutely. INSTRUMENTS FOR EXTRACTING TEETH. 115 As the upper molar teeth have, alinost uniformly,three roots, two external and one internal, it is evi-dent that, to fit the tooth accurately, the blades ofthe instrument must be of entirely different ; the internal blade must be a single concave or Pjo. 2.).. crescent shape, and of the width of the neck of amedium sized tooth of that class. The externalblade, at its point, must be a double concave, with apoint between, to fit into the bifurcation of the ex-ternal roots. But, as these external roots are ofunequal sizes, the anterior being larger and also moreprominent than the other, so the grooves or concavitiesin the blade of the instrument must be of difterent 116 INSTRUMENTS FOR EXTRACTING TEETH. sizes to fit them ; the anterior groove being bothlarger and deeper than the posterior, otherwise thebearing of this blade will be only on the anteriorroot, and the point, intended for that purpose, cannotreach the bifurcation of the roots ; the result of whichwould be that the instrume
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