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There are various mastoid chisels in use, some being acutely rounded at the end, some being square, others having concaveconvex bodies and still others being flat. All have their advantages and their disadvantages. Those with markedly rounded cutting edges allow the apex to sink into the bone before the sides, and thus necessitate uncertain chiseling, while the square-edged chisels, with pointed corners, are dangerous, as injury to the nerves, sinus, brain, etc., is liable to be caused by the sharp angles of the lateral edges. To avoid such difficulties and to possess a chisel combining the good and none of the bad qualities of the instruments in general use, I have had made, in six different sizes, a set of chisels which are concave-convex, bevel-sharpened on the front, very gently rounded on the back and slightly rounded on the edge with the corners turned forward so as to inflict no
Allport F. NEW MASTOID CHISELS. JAMA. 1912;LIX(23):2066. doi:10.1001/jama.1912.04270120051015
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