a. Processing Tank. The processing tank most commonly used in dental
clinics has three compartments (see figure 3-4). The compartment to the left contains
the developing solution, water is in the center compartment, and the fixing solution is on
the right. In addition to the three compartments, a source of hot and cold water, a drain,
an overflow valve, and a cover are needed. The water is adjusted to the proper
temperature and is allowed to circulate in the middle compartment and pass from the
tank by the overflow valve. This action provides temperature controls to the developing
and fixing solution.
Figure 3-4. Tank for processing dental film.
b. Processing Procedures. In order to produce a radiographic image, the
processing procedure for the film is sequenced as follows: developing, rinsing, fixing,
washing, and drying. The quality and diagnostic value of radiographs depend upon
proper processing procedures.
c. Developing. All equipment should have a definite place in the darkroom to
facilitate handling when the user is working by the safelight only. Steps used when
developing film are as follows:
(1) Wash gloved hands so that they are clean and dry. This is to prevent
the appearance of finger marks on the developed film.
Remove the lightproof wrapper from the film.
Dispose of contaminated wrappers in accordance with (IAW) local standing
operating procedures (SOP).