Restorative & Materials · single question
Which cement is radiolucent and can obscure diagnostic properties on an X-ray?
Show answer and explanation
Correct answer: C. Composite resin
- A. Amalgam is highly radiopaque (appears bright white on radiographs) — it does NOT obscure underlying radiolucent pathology; instead, it creates scatter/shadow artifacts.
- B. RMGIC is typically radiopaque due to heavy metal fillers added for radiopacity.
- C. Correct. Composite resin is radiolucent (or only mildly radiopaque depending on formulation). When placed as a core or restoration, it may be indistinguishable from secondary caries or underlying pathology on radiographs, obscuring the diagnostic image.
- D. Silicate cement (historical material) is relatively radiolucent, but it is no longer in clinical use.
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