. Principles and practice of filling teeth. 60 PRINCIPLES AND PRACTICE OF FILLING TEETH. serviceable kind of ligature is waxed floss silk, on account of itsgreat strength in relation to its bulk, thereby admitting a suffi-ciently strong ligature to be readily forced between the teeth. In cases where the dam has a tendency to be dragged over theligature and become displaced, leaving the ligature on the tooth,the difficulty may be overcome, by the use of small glass beadsstrung on the ligature and distributed at various points around thetooth. On a molar, for instance, where the tendency would b
. Principles and practice of filling teeth. 60 PRINCIPLES AND PRACTICE OF FILLING TEETH. serviceable kind of ligature is waxed floss silk, on account of itsgreat strength in relation to its bulk, thereby admitting a suffi-ciently strong ligature to be readily forced between the teeth. In cases where the dam has a tendency to be dragged over theligature and become displaced, leaving the ligature on the tooth,the difficulty may be overcome, by the use of small glass beadsstrung on the ligature and distributed at various points around thetooth. On a molar, for instance, where the tendency would begreatest for the dam to slip, a bead may be placed respectively atthe disto-buccal, the disto-lingual, the mesio-buccal, and the mesio-lingual angles of the tooth, and these beads will present sufficientbulk to resist the displacement of the dam. In lieu of beads Dr. Fig. E. K. Wedelstaedt has suggested the tying of a small roll of cot-ton in the ligature, and thus creating bulk. The manner ofadjusting the ligature is to force it between the teeth on the distalsurface of the tooth to be ligated, pass it around the lingual sur-face, and out buccally or labially, as the case may be, between themesial surface of this tooth and the distal surface of the one nextin line. The two ends of the ligature now extend out so theoperator may readily grasp them, but the portion embracing thetooth is usually not far enough rootwise. Before attempting toforce the ligature to place the first loop of a surgeons knot shouldbe formed, like Fig. 25, by passing one end of the ligature twicearound the other, instead of once. This kind of a knot will holdfirm when drawn tight against the tooth to a greater degree thanwhere the ordinary knot is used, and will thus admit of the secondloop of the knot being tied without the ligature loosening. Before EXCLUSION OF MOISTURE DURING
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