Radiographic localisation

Question 1

Radiographic localisation - why is it necessary?

Answer 1

to determine location of a structure or pathological lesion in relation to other structures
- only needed where clinical examination is insufficient to provide answer

Question 2

clinical situations where radiographic localisation may be required

Answer 2

position of unerupted teeth
- normal but impacted/ectopic
- supernumerary
- proximity to important structures
location of roots/root canals
- endodontics
- surgery
relationship of pathological lesions
trauma
- dental
- bone fractures
soft tissue swellings

Question 3

Options for viewing teeth at right angles

Answer 3

= panoramic and lower true occlusal
- panelling periodical and lower true occlusal
- CBCT - cone beam CT

Question 4

What is parallax?

Answer 4

an apparent change in the position of an object, caused by a real change in the position of the observer

Question 5

SLOB - acronym meaning

Answer 5

same
lingual
opposite
buccal

Question 6

parallax locationtion - options

Answer 6

horizontal tube shift - equivalent views
- 2 periapicals
- 2 bitewings
- 2 oblique occlusal
vertical tube shift - different views
- panoramic and oblique occlusal
- panoramic and lower (bisecting angle) periapical