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Fio. 80.

Fia. 82. Fig. 83.
Fig. 80. Fifth S'rasp, for molar toelli. purticularly the third molars. Ste text for description.
First position ; the rubber is caught between the first and second fingers of both hands, with both
thumbs on the occlusal side ; each thumb giasps the rubber against the second joint of the closed
second finger.
Fig. 81. Fifth grasp. Second position ; stretch the rubber by the grasp between the thumbs
and second fingers ; by bending the two forefingers, catch them in the rubber close on either side
of the hole to be used, which is cut a little larger than usual, and stretch the hole open as shown.
See that the distal margin of the hole comes over the end portion of the pulps of the fingers and
that the median sides of the fingers are well over the margins of the hole as shown.
Fig. 82. Fifth grasp. Position right side behind, head of patient thrown well back. The
special rubber dam clamp has previously been set over the upper third molar of left side. First
movement ; find the nibbor dam clamp hy the sf-nse of touch pass the distal margin of the
;
hole in the rubber over the lingual portion of tlio distal margin of tlin clamp ; it may lie heard and
I'clt to snap as it goes over; bring the finger on the lingual side to the lingual foot of the ehimp,
then holding carefully, direct the patient to close I lie teeth lightly on the fingers to move the
ramus of the lower jaw backward out of the way and sweep the finger on the buccal side over the
clanip to its buccal foot.
Fig. S3. Fifth grasp. Second niuvi-ment ; nli'ase the hold nn the rubber with the thumbs and
second fingers; generally the rubber will be felt closing on the fingers; a slight shaking movement
will cause it to slip by the fingers and close around the tooth unner the elamp. These movements
should be conducted by the sense of touch ; and for this reason it is unnecessary to have the rubber
held away by the fingers of the assistant, as shown in the ilbistration, except for the purpose of
photographing.
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