digital extraoral radiography Flashcards
problem with extraoral radiography
LAcks details
Pros of extraoral radiography
less invaisve
fast
relatively low dose
what is esntial for extraoral radiography
PAtient positioning
what may result if poorly done extraoral radiography
Superimposiioin and unequalmagnificaion/distortion of anatomical strucutres
what has been replacing extraoral radiographs
MDCT
CBCT
MRI
- 3D imaging
Indications for Extraoral radiographs
Osseous components of the TMJs Impacted teeth eruption abnormalities PAthology Trauma
what incorrectly done images may for in extraoral images
Double images
Ghost images
how to do pre-scan preps
Optimize exposure options to patient
Remove metal to obscure
lead apron
Position patient in machine
what to reference in patient positioning
Mid-sagittal plane
Cannthomeatal line/ frankfort horizontal plane
Canine reference planes
what to tell the patient before taking image
Close lips
Swallow
TOngue placed on roof of mouth
Hold still
what are some other extraoral projections
Lateral cephalometric -side of head
Posteroanterior (PA) cephalometric - striat forward
Water’s submentovertex - head angled upwarads slightly
Reverse Towne’s -head faced down
Lateral oblique
when to use a lateral cephalometric/ skull projection
Evaluation of craniofacial skeletal morphology
developmental growth
Occlusal relationship
Treatment progress
when to use a PA Cephalometric skull projection
Evaluation of facial asymmetric and orthognathic surgery
