. Elementary and dental radiography . e surface presenting away from the seam of the enclosingenvelope. The twelfth film—the one farthest from the seam—has thesensitive surface presenting inward the seam. Because it is efficacious and is furnished promptly and at a reasonablecost, the most popular dental X-ray film is the Eastman film suppliedin -mall packets. The black paper of the packet is thick enough to pro-tect the film against moisture when taking pictures of the upper teeth,but additional protection is needed when making radiographs of the lower IXC DENTAL RADIOGRAPHS 87 teeth. Th
. Elementary and dental radiography . e surface presenting away from the seam of the enclosingenvelope. The twelfth film—the one farthest from the seam—has thesensitive surface presenting inward the seam. Because it is efficacious and is furnished promptly and at a reasonablecost, the most popular dental X-ray film is the Eastman film suppliedin -mall packets. The black paper of the packet is thick enough to pro-tect the film against moisture when taking pictures of the upper teeth,but additional protection is needed when making radiographs of the lower IXC DENTAL RADIOGRAPHS 87 teeth. This protection may be given by covering the packet with rubberclam. The rubber dam is staked out with pins to prevent curling, andcovered with ordinary rubber cement, such as is used to repair the innertubes of bicycles and automobile tires. Allow the cement to dry a minuteor so. Place the packet on one end of the rubber, remove the pins atsaid end, and fold the rubber; so covering the packet. Trim off theexcess rubber. (Fig. 78.). Fig. 79. Illustrating method of covering a more or less circular film with black paper. This method of protecting the film against moisture is so much better—easier, quicker, more efficient, and less expensive—than the usualmethod of covering the film with unvulcanized plate rubber that adescription of the latter will not be given. Lately I have adopted a method of covering film packets to protectthem against moisture, that is just as efficacious and much more con-venient and less expensive than the one just described. Take a piece ofmending tissue, such as is used by tailors to mend clothing, of such sizethat when folded over the film packet (Fig. 78, C and D) it will extendbeyond the packet on the three open slides, about one-half inch. Warmthe edges of the tissue slightly by passing over the flame of an alcohollamp or Bunsen burner, and pinch them together. Then warm them (theedges) to stickiness again and turn them back and stick them to t
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