.SLOB TECHNIQUE

.ITS INDICATIONS

.ADVANTAGES AND DISADVANTAGES.

Department of Operative Dentistry

Presenter: MANSOOR AHMED

Supervised by Dr: M.ALI

What is SLOB Technique?

Stands for: Same Lingual, Opposite Buccal

Also known as:

1) Cone shift technique

2) Tube shift technique.

3) Clark’s technique.

4) Buccal object rule.

The principle states that the object closest to the buccalsurface appears to move in the direction opposite the movement of the cone or tube head, when compared with a second film. Objects closest to the lingual surface appear to move (on a film) in the same direction that the cone moved; thus the "same lingual, opposite buccal" rule

.when the tube head is shifted mesially, the lingual or palatal

root will also be shifted mesially (in the same direction as

the shifted tube head) on the developed film and the buccal

or mesiobuccal root will be shifted distally (in the opposite

direction as the shifted tube head

Basic Radiographic Technique.The film is placed parallel to the plane of the arch..Cone has the central ray.

SLOB Radiographic Technique

Indications and Advantages of

SLOB technique

1. Separation and identification of superimposed canals

2.Movement and Identification of

superimposed structuresAn example is the zygomatic process,which often

obscures the apices of maxillary molars.

3.Determination of working length

4.Determination of curvatures

5.Determination of faciolingual locations.

(One of the important indication for

impacted canines.)

6.Identification of undiscovered canals

INDICATIONS / ADVANTAGES (Continued)

7. Location of Calcified Canals.

8. Application of the technique allows to distinguish

between various types of resorption.

9. It also helps the to determine the buccolingual

position of fractures and perforative defects.

10. To locate foreign bodies and to locate

anatomical landmarks in relation to the root apex,

such as mandibular canal.

Disadvantages1. Decreased ClarityRays passing through the object and striking the film at an angle the object becomes blurred.(More angle = More blurred)

2.Superimposition of structuresObjects that ordinarily have a separation on parallel radiographs may, with cone shift,moverelative to each other and become superimposed.Example: Roots of Maxillary molar.A mesial or distal angled radiograph moves the palatal root over the distobuccal or mesiobuccal,reducing the ability to distinguish the apices clearly.

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