The purpose of this study was to compare the qualities of the four different processing chemicals(solutions).
With EP 21 films(Ektaspeed phis film, Kodak Co., USA), nine unexposed and nine exposed films of a step wedge were processed utilizing automatic film processor(XR 24, Durr Co., Germany) for 5 days. During 5 days, the total number of processed films including out-patient´s intraoral films were about 400-500 for each brand.
Base plus fog density, film density, contrast of processed films were measured with densitometer(model 07-443. digital densitometer, Victoreen..Co., USA). These measurements were analyzed for comparison.
The results were as follows,
1. For the base plus fog density, there was significant difference among the four chemicals (p<0.05). The sequence of the base plus fog densities was in ascending order by Kodak, X-dol 90, Agfa and Konica.
2. For the film density, all chemicals showed useful range of photographic densities(0.25-2.5). The sequence of the film densities was in ascending order by Kodak, X-dol 90, Konica and Agfa. But there was no statistically significant difference of film density between X-dol and Kodak (p<0.05).
3. The sequence of the contrasts was in ascending order by Konica, X-dol 90, Kodak and Agfa. But there was no statistically significant difference of contrast between X-dol and Konica (p<0.05).
These results indicated that the four processing chemicals had the clinically useful film density and contrast, but only Kodak processing chemical had useful base plus fog density.
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