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Fig. G6.

Fig. 07. Fig. GS.

Fig. GG. First rubbep dam grasp, for upper front teeth. See tabulation of grasps, also text.
The two thuTiibs on the occlusal side with the nails of each over the edges of the hole, which is
stretched a little. The two forefingers are on the gingival side opposite the thumbs.
Fia. 67. First grasp. Position right side in front ; patient's head thrown back. First move-
ment pass the rubber over the tooth ; thumb nails are next to tooth and carry the edge of the
;
hole hard against the giuns. Notice particularly that the object is to carry the edges of the hole
in the rubber fully to the gingivae.
Fig. 68. First grasp. Second movement ; hold the thumbs firmly in position as in Figure 67 ;
let go the grasp of the rubber with the forefingers, still holding it with the thumbs, with the nails
against the tooth. A little shaking motion of the thumbs, without releasing the pressure, allows the
rubber to close around the tooth ; remove the thumbs. If these movements are rightly made, the
edges of the hole will be turned under the gingiva'. (Jrasp the next hole in the rubber in the same
way and repeat the same movements for tooth after tooth. This particular use of the nails is
essential in all rubber dam grasps.