Radiographs Flashcards
What are radiographs
Images created using X-ray photons
X-ray photons pass through an object before interacting with a receptor
What does transmitted mean
Passes through unaltered
What does absorbed mean in radiographs
Stopped by the tissue
Within radiographs what does scattered mean
Changes direction
which radiograph is not intra oral
panoramic
lateral
Why are there different shades of grey in radiographs
Correspond to the types of tissue that the X-ray passed through
What does radiolucent mean
Darker areas on image
Less attenuation of X-rays
What is the name for the lighter areas on the image where more attenuation of X-rays has occurred
Radioplaque
Why use radiographs
To show anatomy and pathology not visible to the naked eye
How do radiographs identify caries
They result in a decreased radiodensity therefore appears radiolucent (darker) compared to the rest of the tooth
What are the intra-oral radiographs
Bitewing
Periapical
Occlusal
What are the extra-oral radiographs
Panoramic
Lateral
Which radio graph is cross-sectional
Cone beam computed tomograph
What is the purpose of a bitewing radiograph
Provides a view of multiple side teeth (molars, pre-molars) including:
crowns
parts of roots
some interdental bone
What is a periapical radiograph
Provides a full length view of a particular tooth/teeth
Shows:
crown
entire tooth
bone structure around tooth
Only one dental arch can be imaged at a time
What does a panoramic radiograph show
Provides a ‘zoomed out’ view of the jaws
Shows:
Entire dentition as well as jaws and mid-face
Worse resolution than intra-oral radiographs
What can an occlusal radiograph capture
Provides a view of one dental arch
Either maxillary OR mandibular
Taken at different angles:
-Anterior
-Lateral
-True
-Oblique
What are the disadvantages of Cone beam computed tomography
Increased radiation dose
Increased cost
What does cone beam computed tomography capture
Provides cross-sectional imaging of the teeth/jaws: ‘3D scan’
What is the curve of Spee
Normal anatomical curvature of the occlusal plane
Curves upwards posteriorly
Where is the mental foramen
Lies below premolars
