Radiology · single question
A panoramic radiograph is shown. What does the image most likely demonstrate?
Show answer and explanation
Correct answer: A. Impacted permanent first molar (#6)
A) Impacted permanent first molar — CORRECT.
On careful analysis, the erupted tooth in the area shows deciduous (primary) tooth anatomy, while the permanent first molar is present but impacted. Key distinguishing feature: the erupted tooth is a primary molar (retained C) identifiable by its root morphology and crown anatomy. The unerupted permanent first molar below/beside it is IMPACTED — not a supernumerary tooth because it has normal first molar anatomy.
B) Retained primary molar: The retained primary IS present, but the question asks what you see — the impacted permanent tooth is the clinical finding requiring attention.
C) Supernumerary: A supernumerary tooth would be an EXTRA tooth beyond the normal complement — this is the normal permanent first molar that is impacted.
D) Normal eruption: The permanent first molar is impacted — this is not normal.
On careful analysis, the erupted tooth in the area shows deciduous (primary) tooth anatomy, while the permanent first molar is present but impacted. Key distinguishing feature: the erupted tooth is a primary molar (retained C) identifiable by its root morphology and crown anatomy. The unerupted permanent first molar below/beside it is IMPACTED — not a supernumerary tooth because it has normal first molar anatomy.
B) Retained primary molar: The retained primary IS present, but the question asks what you see — the impacted permanent tooth is the clinical finding requiring attention.
C) Supernumerary: A supernumerary tooth would be an EXTRA tooth beyond the normal complement — this is the normal permanent first molar that is impacted.
D) Normal eruption: The permanent first molar is impacted — this is not normal.