extra oral views Flashcards
what views can be taken to view the mandible
postero-anterior mandible
lateral oblique mandible
DPT
what views can be taken to view the maxilla and cranium
lateral ceph
occipito mental view of the face
sailography
what 3 landmarks do we need to be aware of
radiographic baseline
frankfurt plane
maxillary occlusal plane
what is the radiographic baseline
line from outer canthus of the eye to external acoustic meatus
what does the radiographic baseline represent
the BASE OF THE SKULL
what is the frankfurt plane
line from the inferior orbital border to upper external acoustic meatus
when is the frankfurt plane used
when taking a DPT
what is the maxillary occlusal plane
line from the ala of the nose to tragus of the ear
when is the maxillary occlusal plane used
in cone beam ct
what causes compton scattering
when x rays pas through tissue, some are scattered
what would happen if we didnt manage scattering
add to background fog, producing a greyer image lacking contrast
what are PA mandible used for
mainly fractures (including medio-lateral displacement)
midline usually obscured by spine
what are the advantages of pa mandible
reduced magnification
reduction dose to eyes (lens is quite photosensitive)
how are PA mandibles taken
pt faces receptor
nose and forehead touching receptor
aim centre of beam to midline of pt - height of mid ramus
when are lateral obliques taken
fractures, pathology, 8s assessment, dental assessment, caries
