Buccal object rule

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The initial radiograph (left) indicated that a metal foreign object was embedded somewhere in or near the teeth, but upon clinical examination, it could not be found anywhere in the gum tissue. Upon taking another radiograph (right) exposed at a very severe distal angulation, however, the metal fragment appeared to move a great deal to superimpose on the facial aspect of the premolar, indicating that the fragment was way more buccal than initially suspected. With the use of this second film, it was determined that the metal fragment was indeed embedded in the cheek.

The buccal object/SLOB rule is a method used to determine the relative position of two objects in the oral cavity using projectional dental radiography.

In 1909, Charles A. Clark described a radiographic procedure for localizing impacted teeth to determining their relative antero-posterior position.[1] If the two teeth (or, by extension, any two objects, such as a tooth and a foreign object) are located in front of one another relative to the x-ray beam, they will appear superimposed on one another on a dental radiograph, but it will be impossible to know which one is in front of the other. To determine which is in front and which is behind, Clark proposed his SLOB rule, as a complicated set of three radiographs, but which can be simplified as follows using just two:

Expose another film while angle of the x-ray beam has been changed. If an object moves in the same direction as the source of the x-ray beam, it is lingual to the other object. If the object moves in the opposite direction of the source, it is buccal to the other object.
Same Lingual; Opposite Buccal

SLOB rule in Dentistry Video Tutorial

Buccal Object Rule

References

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