Research Article| Volume 27, ISSUE 2, P177-183, February 1969

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Effect of radiation fog on the radiographic contrast of dental films

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      An experiment has been described whereby density and contrast were measured on Kodak Ultra-Speed, Du Pont LF, and Du Pont Dl periapical dental films. The films were positioned beneath a water phantom which simulated the scattering of radiation by tissues of the face. A small lead shield was in contact with a portion of the film packet to provide an area of control (reference) density. Another portion of each film received the image of a lead disk which was suspended in the water at a distance of 25 mm. from the film. The remainder of the film was subjected to both primary and secondary (scattered) radiation. All films were processed with two brands of developers, namely, Du Pont Xtra Fast and Kodak Rapid.
      The results and their important implications in dental practice are as follows:
      • 1.
        1. Film speed was constant, despite the change in the brand of developer.
      • 2.
        2. Variation of the contrast, as a function of the developer, was within 10 per cent.
      • 3.
        3. By using Du Pont developer, a saving of 2 minutes in developing time can be gained without affecting film speed or radiographic contrast.
      • 4.
        4. There was no major difference in contrast between the film types used in this study. Therefore, high-speed dental films should be employed without fear of any major deleterious effect on image quality.
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        • Shawkat A.H.
        A Quantitative Study of Scattered Radiation Fog on Low- and High-Speed Dental Roentgenograms.
        Oral Surg., Oral Med. & Oral Path. 1965; 20: 42-55
        • Morgan R.H.
        An Analysis of the Physical Factors Controlling the Diagnostic Quality of Roentgen Images.
        Am. J. Roentgenol. 1945; 54: 128
        • Henrikson C.O.
        The Speed and Contrast of Dental Films.
        Acta radiol. 1963; 1: 77