. The principles and practice of dental surgery. ple and easy; but there are manycases in which it is both difficult and tedious. The head of thepatient should rest with the face upward, as already described,and sustained in the same way with the left arm of the operator;while, with the thumb of the left hand placed on the gum abovethe tooth, the upper lip should be elevated. The fore-finger should be pressed firmly against the palatinesurface of the tooth, and the left side of the chin gently graspedwith the other three fingers. Then, withan instrument (Fig. 105) having a wedge-shaped point,
. The principles and practice of dental surgery. ple and easy; but there are manycases in which it is both difficult and tedious. The head of thepatient should rest with the face upward, as already described,and sustained in the same way with the left arm of the operator;while, with the thumb of the left hand placed on the gum abovethe tooth, the upper lip should be elevated. The fore-finger should be pressed firmly against the palatinesurface of the tooth, and the left side of the chin gently graspedwith the other three fingers. Then, withan instrument (Fig. 105) having a wedge-shaped point, grasped with the right hand,as in Fig. 102, or 106, the operator shouldproceed to introduce the gold, standing atthe right side of the patient, with the thumb of the right handresting on a tooth to the left of the one he is about to fill, <^^against the cheek. He should commence by laying the firstfolds against the walls of the cavity nearest to him, and thusintroduce fold after fold, until it is compactly filled. The ex- FiG. 106. Fig. ?•,<l/ truding portion may be consolidated with a round or square-pointed instrument, or with a straight-pointed one as representedin Fig. 107. Great care is necessary to prevent the instrumentfrom slipping and wounding the gums. After having partially FILLING SUPERIOR INCISORS AND CUSPIDS. 295 consolidated the gold, the overlapping portion must be firmly pressed toward the centre of the cavity,^ . • Fig. 107. and the point of the instrument repeat-edly applied to every part of the surfaceof the filling, until it can no longer be made to yield to pressure. This done, the gold may be fileddown to the level of the tooth, smoothed with Arkansas stone,and burnished or polished. When the cavity is shallow and the orifice broad, the gold asit is introduced must be held in its place with the thumb of theleft hand, until a sufficient quantity has been placed in the cavityto obtain for it the necessary support from the surrounding
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