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radiology endodontics teleradiography intraoral exam stomathognatic apparat panoramic carpus orthopanthomography maxillofacial surgery implantology x-ray computed tomography pediatric dentistry tooth orthodontics cone beam gnathology temporomandibular joint periodontics dentistry spot film device collimator medical radiology tomography work techniques column anatomic exposure control image receptor anatomic programs x-ray table generator potter bucky fluoroscopy x-ray tube grid radiography high tension cables high frequency generator