Conservative and Endodontics MCQ Answer 18

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Answer b) lingual

Pathways of the Pulp, 8th Ed, Cohen and Burns 2002, 120-123

SLOB Rule.

Same Lingual, Opposite Buccal. Also known as BOR, Buccal Object Rule, or Clark's Rule.
Helps clinician radiographically determine B-L position of fractures, perforations, foreign bodies, and anatomic landmarks in relation to root apices or other bony landmarks.
*Object closest to the buccal surface appears to move in the direction opposite the movement the movement of the cone or tube head when compared with a second film.
This also applies to vertical tube head angulations.