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Abstract
Conventional dental periapical x-ray machines are frequently used for taking extraoral
radiographs. Such views as the anteroposterior, lateral skull, oblique, Caldwell,
Waters, etc. require large focus-to-film distances. A positioning device that makes
long-distance positioning easy and foolproof has been developed. This eliminates undesirable
repetition and therefore reduces unnecessary exposure of the patient.
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© 1985 Published by Elsevier Inc.
