Radiographs Flashcards
What does the X-ray tube produce
Beams of x-ray
What can happen to the x-ray photons as they transverse tissue
Pass through unaltered
Change direction with no energy loss (scatter) or losing energy (scatter energy with absorption)
Be stopped, depositing all energy within tissue (absorption)
What are the different types of image receptora
Digital receptors (direct or indirect)
X-ray film packets
Screen-film
Combinations
How can the conversion of the latent image to the permanent visible image occur
Digitally of chemically
What are digital receptors
They react directly with x-ray photons or interaction with x-ray photons is still there but there has to be another step after to see the outcome
What are x-ray film packets
They are plastic covers that inside have a piece of x-ray film which directly reacted with the x-ray
What are screen film combinations used for
Extra oral radiography
What does a radiographic image allow
Pictorial representation of a part of the body
A record of the pattern of attenuation of the x-ray beam after it has passed through the matter
What are the intra-oral dental radiographic views
Bite wings
Periapical
Occlusals
What are the extra-oral dental radiographic views
Panoramic (DPR/DPT)
What are bitewings
Radiograph taken as patient bites on something between their upper and lower teeth
What teeth are bitewings usually done on
Molars
Why is it important not to get an overlap of adjacent teeth
So important information is not missed
What are bitewings used for
Caries diagnosis where the teeth contact each other
To see alveolar bone levels
Check how good restorations are
What are lateral cephalometric radiographs
They focus on the side of the head and are often used for orthodontic treatment
What are the dark changes in bone due to
Inflammatory changes in bone
What are periapicals used for
To assess bone levels and to see the change in bone supporting the roots
Why is a panoramic radiograph taken
The whole dentition can be seen
Useful for children moving where you are considering taking teeth out to avoid crowding
Can give a generalised view of bone levels
What happens in an occlusal radiograph
A film is placed in the occlusal plane
What are the different types of occlusal radiographs
Oblique
True
What is an oblique occlusal radiograph
Gives a large periapical style
Can be taken everywhere
What is a true occlusal radiograph
Gives a cross sectional view of the teeth however usually CBCT is used instead
Only used for lower teeth
How are radiographs viewed
Using a viewing box The uppers are placed at the top Right teeth to your left Incisors to the midline Molars to the side edges Top and bottom row is periapicals
What is the curve of spee
The curve that goes from anterior to posterior of the teeth and curves up slightly posteriorly
