what causes distortion on radiograph
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Extra-oral views are not ideal for dental examination mainly due to superimposition of the contra-lateral side, which obscures the image and causes distortion of the image. However, it may be possible to obtain diagnostic radiographs of the maxillary and mandibular premolars and molars using extra-oral film placement, especially in dogs with wide skulls. Some examiners routinely use extra-oral film placement to radiograph the maxillary premolars and molar in the cat
http://www.vin.com/proceedings/Proceedings.plx?CID=WSAVA2008&Category=3861&PID=23911&O=Generic
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