Parallax Technique — NDEB AFK MCQ
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Correct answer: A — Periapical with parallax (tube-shift technique)
The parallax (tube-shift/Clark's rule/SLOB) technique uses two periapical radiographs taken with different horizontal tube angulations. If the impacted tooth moves in the same direction as the tube shift, it is palatal (Same Lingual, Opposite Buccal = SLOB rule). This 2D technique is effective for determining buccolingual position. CBCT provides the definitive 3D assessment but is not always the first investigation.
Reference: White & Pharoah – Oral Radiology: Principles and Interpretation, 8th ed., 2019