Selection and perception Flashcards
What is somatic deterministic effect?
Threshold dose below which effect will not occur
Severity proportional to dose
Genetic stochastic effects?
Can occur spontaneously or by radiation
DNA damage
What is so somatic stochastic effect?
Subject to law of chance - no threshold dose
What is selection criteria?
Choosing best test to answer question
How to screen for caries?
BW is gold standard
What are intervals for radiographs for radiograph for caries?
High risk - 6 monthly till no new or active lesions remain
Moderate risk - annual
Low caries risk - 2 year intervals (12-18 months children)
Should you radiograph with perio disease?
Guidelines radiographs should be available for all code 3 and 4s - can be BWs or PAs
Is full mouth PA exposure = full panoramic?
No full panoramic is less
What radiographs can be taken for endo?
Pre-tx
Guide file - if guide file > 3mm can repeat film
Master cone
Final fill
Why is pre-XLA radiograph needed for 8s?
Root anatomy tightly variable and complications that need to be discussed to obtain valid consent
What radiographs are best for trauma?
Intra-oral PA or occlusal films best for root or dentoalveolar fractures
Fractured mandible - full panoramic
When could occipitomental view be useful?
To identify bone injury
What imaging is useful for salivary gland disease?
Plain film radiograph can detect calculi
Sialogram gold standard
What are the 3 radio-densities likely to be visible on radiograph?
Soft tissue = grey
Air = radiolucent = black
Bones and teeth = radiopaque = white
What is the difference between radiopaque and Lucent - why do they appear different?
Radiopaque - higher atomic number and denser than normal tissue
Radiolucent - lower density less mineralised
