Panoramic Anatomy

Question 1

what are the two types of misleading shadows present on a panoramic

Answer 1

double shadows, ghost shadows

Question 2

how are double shadows created

Answer 2

by structures located near the centre of rotation which due to their central position are captured twice

Question 3

how are ghost shadows created

Answer 3

by structures between the x-ray source and the centre of rotations

Question 4

how do ghost shadows appear on a radiograph

Answer 4

magnified, blurry, higher and transposed on the opposite side of their true anatomical position

Question 5

what is the selection criteria for panoramic radiographs in the GDP

Answer 5

grossly neglected dentition, part of periodontal bone assessment, bony lesion or unerupted tooth of a size of position that precludes complete demonstration on intra-oral radiographs, assessment of third molars, part of orthodontic assessment

Question 6

what is the selection criteria for panoramics in the dental hospital

Answer 6

assessment for fractures of the mandible, assessment of maxillary sinus pathology, assessment of destructive disease of TMJ articular surfaces, pre-implant planning