Radiology · single question
What is the BEST imaging modality for diagnosing a vertical root fracture (when periapical X-ray is not listed)?
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Correct answer: A. CBCT (Cone Beam CT)
CBCT (A) is the gold standard for diagnosing vertical root fractures when conventional periapical radiography is inconclusive. CBCT provides 3D cross-sectional imaging that can visualize:
• The fracture line in axial and coronal planes
• Periradicular bone loss patterns (halo/J-shape) that may not be visible in 2D films
• Extent of the fracture
• Panoramic (B): poor spatial resolution and geometric distortion make it inadequate for VRF diagnosis.
• MRI (C): excellent soft tissue imaging but poor for hard tissue/fine fractures — not indicated for VRF.
• Bitewings (D): useful for caries and crestal bone levels — not for diagnosing root fractures.
• Note: Even CBCT has limitations — metal restorations cause scatter artifacts that can obscure fine fractures.
• The fracture line in axial and coronal planes
• Periradicular bone loss patterns (halo/J-shape) that may not be visible in 2D films
• Extent of the fracture
• Panoramic (B): poor spatial resolution and geometric distortion make it inadequate for VRF diagnosis.
• MRI (C): excellent soft tissue imaging but poor for hard tissue/fine fractures — not indicated for VRF.
• Bitewings (D): useful for caries and crestal bone levels — not for diagnosing root fractures.
• Note: Even CBCT has limitations — metal restorations cause scatter artifacts that can obscure fine fractures.