CBCT Indications and Interpretation Flashcards
CT skill effective dose in uSv
1000 uSv
Dental Pano effective dose in uSv
15 uSv
dental effective dose of full mouth in uSv
85 uSv
Dental CBCT effective dose in uSv
100 uSv
most common implication for a CBCT
what view is best?
IMPLANT PLANNING
- need to see 3D prjections
- relationship of canal location
cross -sectinoal from the side so you can see the lingual and buccal plate thickness
second reason for CBCT
ENDO - after conventional radiographs - complex anaomty and morphology - suspected perioapical pathosis trauma root resoprtion - apicoectomy planning
top 9 indications for CBCT
- implant
- endo
- ortho
- impactions and extractions
- pathology evaluation
- anatomic structure location
- trauma evaluation
- TMJ evaluation
- airway assessment
elements of a CBCT Radiologic report
- Patient info
- scan info
- radilogic findings - general findings
- radiologic impression - differential diangosis or definitive diagnosis
shades of gray in a CBCT black? grey? light grey? light to white white
black – air / like a sinus
dark gray – fate and loose connective tissue
lighter grey - soft tissue
light grey to white - calcified tissue and bone, teeth
white – metal
sequence you should use when looking at anatomy?
acronym?
- oral cavity
- paranasal
- skull base
- neck
“Only Play Soccer Naked”
look at every slice in how many planes?
3 planes
definition of ostium
small opening
how can you tell it is an axial slice?
aatomy of teeth
- in posterior you have two buccal roots and one palatal root
- woudlnt see this in mandibular
what view will most of our indentifications be in with CBCT?
axial
what is the only strucute we have to identify that could be seen above the orbit?
Frontal sinus
ethmoid air cells found where?
black - within nasal cavity in axial slice
BETWEEN THE ORBITS
OPTICAL CANAL location
find optic nerve and trace it – iti is going MEDIALLY
superior orbital fissure location?
more LATERAL than the optic canal
zygomatic process of the maxilla
his favorite one to test us on
- starts to communicate with zygomatic bone
Pterygopalantine fossa location
note which axial slice as well
just posterior to the maxillary sinuses
looks grey
A(so more superior in the slices he will give us)
infraorbital canal
note which axial slice as well
B*
looks like it is located where the zygomatic process of the maxilla is but in a more inferior slice
- within the bony structure of the mandible
infraorbital foramen will be in basically same place but in a more inferior axial slice
lateral wall of maxillary sinuse
note which axial slice as well
B*
pterygomaxillary fissure
note which axial slice as well
B*
opening into the ptergopalantine fossa
so just posterior to the maxillary sinus and may not have us distinguish between the fissure and the fossa
coronoid process
note which axial slice as well
should start to be going through the level of the condyle
pterygoid plates
should be posteior to maxillary sinus and lateral to the nasopharyngeal airway
mandibular condylar head
somewhat more posterior and lateral
- can recognize the bony outline
ramus of mandible
looks like it is between the zygomatic and the condylar head
is located in the more inferior axial slice he will give us
nasolacrimal duct
more superior in the axial slices
looks more grey than opaque
- lateral aspect of the nasal septums
nasal turbinate
looks grey ish and is medial to the septum
hard palate in close proximity to? in axial slice?
nasopalatine canal and intermaxillary suture
OROPHARYNGEAL airway space vs. nasopharyngeal airway space
OROPHARYNGEA is in the slices more inferior
- going through more of the maxilla nad mandible rather than coronoud process/ orbit area
epiglottis located at what level
lower mandibular dentition
- differentiate this between the uvula
hyoid bone vs greater cornu of hyoid bone?
Hyoid bone is more medial
both are at the level of the mandibular dentition
