Lectures on operative dental surgery and therapeutics . ane perpendicularto the arch, it is forced laterally, so that separation of the 24 teeth is accompanied with less annoyance to the patientthan by any other mode of wedging, as the loose fibres arenot permitted to work ont and encroach upon the tongueor lips. Sometimes it will be found advantageous todip the cotton into sandrac varnish previous to its insertionbetween the teeth, which soon hardens, and forms asolid block. Should cotton be used for wedging in cavitiessituated upon the labial or buccal surfaces, as before men-tioned, the gum
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Lectures on operative dental surgery and therapeutics . ane perpendicularto the arch, it is forced laterally, so that separation of the 24 teeth is accompanied with less annoyance to the patientthan by any other mode of wedging, as the loose fibres arenot permitted to work ont and encroach upon the tongueor lips. Sometimes it will be found advantageous todip the cotton into sandrac varnish previous to its insertionbetween the teeth, which soon hardens, and forms asolid block. Should cotton be used for wedging in cavitiessituated upon the labial or buccal surfaces, as before men-tioned, the gum should be split, and the cotton forced intothe cavity, until considerable pressure is apparent uponthe gum, leaving it there twenty-four or forty-eight hours, when the gingival border will be found driven from itsobjectionable position. Hubber has a place also amongwedging materials, but I cannot advocate its use, for Ihave not only seen painful, but dangerous, results, fre-quently involving periosteal trouble, from a violent andtoo constant pressure.. Fig. 5. a. Pellet of cotton wedged between tlie teeth. b. Silk ligature looped previous to compression. We now come to a consideration of the rubber dam andits use. As it is important to prevent the encroachment offluids of the mouth upon that portion of the tooth wherethe operation of filling is being conducted, this mostvaluable auxihary enables us to perform operations which, w^ithout it, would be an absolute impossibility, especially 25 where teeth are decayed on the approximal or buccalsurfaces. There are but few cases iu which it should notbe used; and, when the operator has become skilfulin applying it, he willingly gives the extra time foradjusting the rubber dam, to be assured of a satisfactoryconclusion of his work. In using the rubber, it requires, not only tact, but skill;for the clamp frequently impinges upon the gum, inflictinga continuous and most excruciating pain throughout thewhole operation; and, in some cases,