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Fig.

Fig. 78. Fig.
Fig. 77. The fourth rubber dam grasp, for bicuspids and first and second molars, both right
and left sides, upper and lower. Both forefingers on the occlusal side, with the finger ends coming
together in the form of an inverted letter V, with the nails over the margins of the hole to be
used. Both thumbs on the gingival side.
Fig, 75. Fourth grasp. For upper left bicuspids, position right side behind ; head of patient
thrown back. First movement
; nails of botli fingers against the tooth passing the rubber over
;
tooth, bringing the nails of both forefingers hanl uiK>n the gingivne and hard against the tooth.
Fig. 7(!. Fourth grasp. Second movement ; release the nibber from the grasp by the thumbs
on the gingival side while holding it firmly on the gingivae by the finger nails on the occlusal side
until the rubber has closed around the tooth.
Kio. 7S. Fourth grasp. For lower left bicuspids, position right side in front; head of patient
upright. First movement pass the rubber over the tooth, bringing the nails
; of both fingers hard
against the gimis close against the tooth.
FiQ. 79. Fourth grasp. Second movement
; release hold by thumbs on gingival side of rubber,
while holding it firmly down by the fingers on the occlusal side; see that the rubber has closed
around the tooth, then remove the fingers.