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CBCT for Third Molars — NDEB AFK MCQ

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ModerateRadiology & ImagingCBCT for Third MolarsNDEB AFK

Which of the following is the primary advantage of cone-beam CT (CBCT) over panoramic radiography for assessment of impacted third molars?

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Correct answer: A — Three-dimensional assessment of the relationship between roots and the inferior alveolar canal

CBCT provides three-dimensional imaging that allows precise assessment of the spatial relationship between third molar roots and the inferior alveolar canal in all planes (axial, coronal, sagittal). This overcomes the superimposition inherent in two-dimensional panoramic imaging. CBCT is indicated when panoramic radiograph signs suggest close IAN proximity (root darkening, canal narrowing/deflection, root apex deflection/bifurcation). CBCT has a higher radiation dose and cost than panoramic but provides critical information that may alter the surgical approach or patient counselling.

Reference: White & Pharoah – Oral Radiology: Principles and Interpretation, 8th ed., 2019