The document discusses the SLOB (Same Lingual, Opposite Buccal) technique, which is used in dental radiography. The SLOB technique involves shifting the X-ray tube head to separate superimposed structures on a radiograph. When the tube is shifted mesially, the lingual root will shift in the same direction and the buccal root will shift in the opposite direction. The SLOB technique has advantages like separating superimposed canals and structures, aiding in working length determination and identifying undiscovered canals. However, it can also cause decreased clarity and increased superimposition of structures at more oblique angles.

1. .SLOB TECHNIQUE
.ITS INDICATIONS
.ADVANTAGES AND DISADVANTAGES.
Department of Operative Dentistry
Presenter: MANSOOR AHMED
Supervised by Dr: M.ALI

2. 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 buccal
surface 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

3. .
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

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

6. SLOB Radiographic Technique

7. Indications andAdvantages of
SLOB technique
1. Separation and identification of superimposed canals

8. 2.Movement and Identification of
superimposed structures
An example is the zygomatic process,which often
obscures the apices of maxillary molars.

9. 3.Determination of working length

10. 4.Determination of curvatures

11. 5.Determination of faciolingual locations.
(One of the important indication for
impacted canines.)

12. 6.Identification of undiscovered canals

13. 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.

14. Disadvantages
1. Decreased Clarity
Rays passing through the object and striking
the film at an angle the object becomes
blurred.(More angle = More blurred)
2.Superimposition of structures
Objects that ordinarily have a separation on
parallel radiographs may, with cone shift,move
relative 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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