7 Radiographic Techniques 2 Flashcards
Why take bitewing radiographs?
- detect caries
- monitor caries progression
- assess periodontal status
- assess existing restorations
For high risk caries patients, how often should radiographs be taken?
Posterior bitewing radiographs at 6 month intervals until no new or active lesions are apparent and patients risk category changes
Vertical bitewings increase radiation dosage as you often need to take 2 of each side instead of 1, in what scenario would you take a vertical bitewing over a horizontal?
For periodontal assessment when you need to see more of the root and supporting bone
What teeth do you want to image in a horizontal bitewing?
distal edge of the 4 to the mesial edge of the 8
What are the positioning requirements for a bitewing?
Film and object parallel
Film and object as close as possible
X-ray beam perpendicular to object and film
What colour of Rinn holder is used for bitewings?
Red in DDH
What is the pros and cons to using a holder for a bitewing?
PRO - holds film accurately, assists in x-ray tube positioning
CON - uncomfortable for patient
What is a more comfortable alternative to a holder, but less accurate?
Paper tab
How do you achieve the x-ray beam being perpendicular to the object and receptor
Make sure all 4 corners of the collimator are touching the guided ring
On a bitewing, where does the orrientation dot go?
Towards the palate
To reduce magnification, what should the source, object and receptor relationship be
LONG source to object relationship
SHORT object to receptor relationship
In a periapical, where does the orientation dot go?
the crown of the tooth
If children do not cooperate with a bitewing radiograph, what alternative can be offered
What is the disadvantage of this?
Lateral oblique mandible
Reduced detail
