Screen film is more sensitive than intraoral film so darkroom conditions must be optimal. The darkroom should be white light tight with GBX-2 (red) safelight filters on the safelight lamps mounted at least 4 feet from the work surface. Quality image processing is dependent on the strength, volume and temperature of the processing chemistry. Properly maintained and replenished solutions at the recommended time and temperature are mandatory. Optimal performance depends on daily, weekly and monthly roller/unit cleaning and solution replenishment or change. In addition, special chemical formulations are needed for processing films at higher temperatures and to accommodate roller transport of the film.
Daylight loader automatic processing systems are not safe for panoramic film loading and processing. The amber screen is not sufficient to remove the spectra of light to which the film is most sensitive and results in film fog. In addition, the internal workspace is usually not adequate for convenient and proper handling of the cassette during film unloading and reloading procedures. If a daylight loader processor is used, it is best to close the amber screen and handle the cassette and film with extreme care so as to not cause white light exposure or handling artifacts.
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