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CUTTING INSTRUMENTS 63

with a pull cut (Fig. 71). Scalers are made in rights and lefts,
in many different sizes and shapes, some for the removal of
large deposits on the crowns of teeth, and others for minute

particles at the neck and under the gum (Fig. 72).
(h) File.—An instrument designed for filing down or re-
moving surplus filling material. The Black (Fig. 'j^),Searle
and '^Flexo^' files (Fig. 74) are prominent examples. Rheine^s
and D. D. Smithes Approximal Trimmers^ popular varieties,

are also useful.

Fig. 72.—Thompkin's scalers.

(i) Saw.—The saw is generally used in a special frame,
and has teeth on one or both sides. It is useful for sepa-
rating teeth and for trimming surplus material from proximal
fillings. The Kaeber, Wilson, Clapp, Gordon-While and 'Uhin-

ribbon^^ saws are prominent varieties (Fig. 75).
Knife.—Synonym, Trimmer, An instrument with a
(j)
thin, knife-like blade, made in various shapes, designed for
trimming or shaving off surplus filling material at the gingival,
buccal and lingual margins of proximal fillings. Blacks^

(Fig. 76), Wedelstaedt^s, Pichler^s (Fig. 77) said Gordon-Whitens
are all useful examples.
(k), (1), (m), (n) Wheel, Point, Disk, Strip.—Wheel. A
small grindstone ranging from K inch to i inch in diameter,
of various thicknesses and made of corundum or carborundum,