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Radiology · single question

What does the SLOB rule in dental radiography stand for, and how is it applied?

  1. Same Lingual, Opposite Buccal — objects moving in the same direction as the tube shift are lingual
  2. Superior Lingual, Oblique Buccal — used for palatal root localization
  3. Same Labial, Opposite Buccal — used for mandibular tooth localization
  4. Subgingival Lingual, Occlusal Buccal — used in periodontal assessment
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Correct answer: A. Same Lingual, Opposite Buccal — objects moving in the same direction as the tube shift are lingual

The SLOB rule (Same Lingual, Opposite Buccal) is a radiographic technique used to determine the buccolingual position of objects (such as roots or foreign bodies) when the horizontal angulation of the X-ray tube is shifted. When comparing two radiographs taken at different horizontal angulations: if an object moves in the SAME direction as the tube shift, it is located on the LINGUAL side; if it moves in the OPPOSITE direction, it is located on the BUCCAL side. This is particularly useful in endodontics for locating the MB2 canal of maxillary molars, and in oral surgery for locating impacted canines or foreign bodies.

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