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EXCLUSION or MOISTURE 109

Cotton rolls are supplied in 6 inch and i^-inch lengths, and in

diameters of 5/16, 3/8, 1/2 and 5/8 of an inch. The smallest
size is designated as number one, the next largest as number






















































Fig. 125.—Applying the rubber dam, showing the rubber dam clamp and clamp
forceps.


two, the next number three, while the largest is number

four. For holding these in position the Ivory, Zimmerman
or Simmons cotton-roll clamp is valuable.
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