Localization Techniques

Question 1

Use of localization technique (why do we need it)

Answer 1

Foreign objects
Root tips
Supernumerary teeth
Impacted teeth
Separation of roots in multi root teeth

Question 2

Methods of localization

Answer 2

Tube shift technique

Right angle technique

Question 3

Purpose of Tube shift technique

Answer 3

Defines location of unknown object relative to position of known object

2 PA xrays used w/ diff horizontal or vertical angulations

Usually can be accomplished w/ FMS with no further exposures

Question 4

Right angle technique

Answer 4

2 xrays taken at right angles to each other

Sometimes called cross sectional technique

Ex. Occlusal radiograph (film at right angle to periapical)

Question 5

Synonyms for tube shift technique

Answer 5

Buccal object rule
SLOB rule
Clark’s rule
BAMA rule (buccal always moves away)

Question 6

Tube shift technique

Answer 6

One PA radiograph taken

2nd PA radiograph taken: film stays in same position and tube head is shifted either mesial or distal in relation to the position of the previous radiograph

Question 7

In tube shift technique, object is LINGUAL if…

Answer 7

Object of interest moved relative to the reference point in the SAME direction as the tube head

Question 8

In tube shift technique, object is BUCCAL if…

Answer 8

The object of interest moved relative to the reference point in the OPPOSITE direction of the tube