What radiographic signs indicate approximal caries on a bitewing image?

What radiographic signs indicate approximal caries on a bitewing image?

• A. Radiopaque bands at contact areas.
• B. Radiolucent zones at the contact areas between adjacent teeth, often starting at the enamel-dentin junction and progressing toward the pulp.
• C. Uniform radiopacity between teeth.
• D. No radiolucency at contact areas.

Answer: (B)

Approximal caries on bitewing films show up as radiolucent areas located at the contact points between neighboring teeth. As caries progresses, demineralization begins in the enamel—often near the enamel-dentin junction—and the dark (radiolucent) area extends inward toward the pulp as it penetrates dentin. This pattern—a radiolucent zone precisely at the contact between teeth, starting at the enamel-dentin junction and moving toward the pulp—is the classic imaging sign of approximate caries on bitewings. Other patterns, like radiopaque bands, uniform radiopacity between teeth, or no radiolucency at contacts, do not indicate decay.

Approximal caries on bitewing films show up as radiolucent areas located at the contact points between neighboring teeth. As caries progresses, demineralization begins in the enamel—often near the enamel-dentin junction—and the dark (radiolucent) area extends inward toward the pulp as it penetrates dentin. This pattern—a radiolucent zone precisely at the contact between teeth, starting at the enamel-dentin junction and moving toward the pulp—is the classic imaging sign of approximate caries on bitewings. Other patterns, like radiopaque bands, uniform radiopacity between teeth, or no radiolucency at contacts, do not indicate decay.