Restorative & Materials · single question
What appears as a radiolucent black 'line' in the ramus area on a panoramic radiograph?
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Correct answer: A. Air space (pharyngeal airway or pterygomandibular space superimposed)
- A. Correct. A black (radiolucent) line in the ramus region on a panoramic radiograph typically represents an AIR SPACE — specifically the pharyngeal airway or pterygomandibular space (air between the medial surface of the ramus and the pharynx) projected through the ramus. This is a normal anatomical ghost image and should not be mistaken for pathology.
- B. The inferior alveolar canal appears as a radiolucent band (canal shadow) within the mandibular body, not the ramus.
- C. The internal oblique ridge is a RADIOPAQUE line on the lingual surface of the mandible — not radiolucent.
- D. A fracture would present as a distinct, irregular radiolucent line — not the typical uniform dark band seen from air space superimposition.
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