Interproximal burn-out is best described as radiolucent area outlined by normal anatomy. What is this artifact most commonly mistaken for?

• A. A true caries lesion
• B. Radiopaque feature due to enamel
• C. Not visible on radiographs
• D. Another artifact entirely

Answer: (A)

Interproximal burn-out is an imaging artifact caused by how enamel and dentin radiodensity interact with the X-ray beam and the geometry of the bitewing view. The result is a radiolucent area between adjacent teeth that looks like a small gap in the tooth structure, but it is actually bounded by the normal contours of the teeth rather than by actual decay.

This appearance is most commonly mistaken for a caries lesion because both present as radiolucent shadows in the interproximal space. The difference is that burn-out follows the predictable, intact anatomy and tends to align with the normal enamel/dentin borders, whereas real caries involves demineralization beyond those boundaries and would show a progressive, irregular outline that encroaches on tooth structure.

In practice, you differentiate by checking whether the radiolucency lies within the expected anatomic confines and whether it changes with different angles or radiographs. If the area maintains a sharp border defined by intact enamel/dentin and lacks any clinical evidence of decay, it’s interpreted as burn-out rather than caries.