. The principles and practice of dental surgery. ation of a cavity for the proper reception and retention of afilling, a variety of instruments are required, which should beconstructed of the best steel, and so tempered as to prevent themfrom either breaking or bending. Their points should be soshaped, that they may be conveniently applied to any part of atooth, and made to act readily upon the portion which it is neces-sary to remove. The instruments employed for this purpose are called excava-tors. They may be formed either with handle and point in one piece; or fitted to se-FiG. 82. ^ , „ p
. The principles and practice of dental surgery. ation of a cavity for the proper reception and retention of afilling, a variety of instruments are required, which should beconstructed of the best steel, and so tempered as to prevent themfrom either breaking or bending. Their points should be soshaped, that they may be conveniently applied to any part of atooth, and made to act readily upon the portion which it is neces-sary to remove. The instruments employed for this purpose are called excava-tors. They may be formed either with handle and point in one piece; or fitted to se-FiG. 82. ^ , „ parate handles made of wood, ivory, pearlor cameo; or be madeto fit into one commonsocket handle. Thosehaving separate han-(j/ dies are more conve-nient than the others,but it would be well forevery practitioner tobe provided with a num-ber of each kind. Steel-handled excavators arecheaper than woodenor ivory-handled ones;but if small they are not so easily grasped, and if large theybecome too heavy. The handle best suited for delicate manipu-. IXSTRUMENTS FOR FORMING THE CAVITY. 273 lation is made of cocoa or ebony, largest an inch above theferule, and tapering both ways. The principle of constructionis to give suflBcient size for the fingers to hold it securely, and tolessen the weight at the end of the handle. Socket handles areuseful for those who wish compactness of apparatus; also forthose who are in the habit of pointing their own 83 represents such an instrument: the lower one made of Fig. 83.
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