Intro to routine radiology

Question 1

What are the 2 effects of ionising radiation.

Answer 1

• Deterministic

• Dose related effect of X-radiation (Eg Marie Curie)
• Should NEVER occur in dentistry

• Stochastic / non deterministic (random)

• May occur with ANY dose of X-radiation
• May occur in dentistry
• Universal precautions

Question 2

What intra oral dental views are available?

Answer 2

• Bitewing radiography
• Periapical radiography
• Occlusal radiography

Question 3

When are Bitewing radiograpghs taken?

Answer 3

Bitewing radiographs

• Mainly taken to look for proximal caries
• Safety net for occlusal caries
• Show crown of tooth + coronal part of root
• Also indicated when periodontal bone loss is less than 5mm

Question 4

study the problems in this radiograph?

Answer 4

Question 5

how much over lap is acceptable?

Answer 5

• As few contact points as possible
• No more than half the thickness of the enamel
• Enamel dentinal junction needs to be clear

Question 6

What is cervical burnout?

Answer 6

An apparent radiolucency found just below the cementum-enamel junction (CEJ) on the root due to

• anatomical variation (concave root formation or root bifurcation) or
• a gap between the enamel and the bone covering the root.

It mimics root caries but don’t get caries on the root without loss of alveolar bone