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Dental radiographic units in which the dental film is placed in an external film cassette. These units are designed for imaging the maxillofacial region using a rotating x-ray beam (panoramic radiography), which produces a single image of the dental arch as a fixed elliptical shape; and/or to obtain images of the complete skull (cephalometric radiography) or of a region of interest from various angles. Some extraoral units can produce multilayered transverse images of the maxillary and mandibular jaws (cross-sectional tomography).
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