. The principles and practice of dental surgery. take a flat single-cut file,more or less fine, according to the size of the serrations wanted ;pass the point of the plugger eight or ten times, witli a steadymovement, across the file, in the direction of the cut. By turn-ing the point and carrying it again across the file, at right-angles with the first cut, the surface is dentated with rows ofsharp points. The extreme point of the instrument must thenbe made as hard as possible (pale straw color), short of brittle-ness; but beyond the point the temper may be more elastic andsofter. Instrument
. The principles and practice of dental surgery. take a flat single-cut file,more or less fine, according to the size of the serrations wanted ;pass the point of the plugger eight or ten times, witli a steadymovement, across the file, in the direction of the cut. By turn-ing the point and carrying it again across the file, at right-angles with the first cut, the surface is dentated with rows ofsharp points. The extreme point of the instrument must thenbe made as hard as possible (pale straw color), short of brittle-ness; but beyond the point the temper may be more elastic andsofter. Instruments with their working extremities bent at variousangles, and of different lengths p,Q ^27. Fig. 128. and sizes, some reduced nearlyto a sharp point, like thoserepresented in Figs. 127, 128,are required in consolidatingthe gold in cavities of thegrinding, approximal, and buc-cal surfaces. The points maybe round or flat as the operator may prefer. Points, also,much smaller than the smallest here represented, bent at differ-ent angles, are 334 INSTRUMENTS EMPLOYED IN FILLING TEETH. Fig. 129.
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