Which statement about bitewing radiographs is true?

• A. They are primarily used to evaluate interproximal caries and crestal bone levels
• B. They replace the need for periapical radiographs
• C. They show the entire tooth length and jaw contour
• D. They are not useful for detecting early caries

Answer: (A)

Bitewing radiographs are designed to visualize the crowns of adjacent teeth and the height of the crestal bone between them, which makes them ideal for spotting interproximal caries and monitoring crestal bone levels for periodontal health. The image focuses on the biting surfaces and the bone between teeth, so you can see early demineralization that starts at the contact areas and assess whether the bone level has changed over time.

They do not show the entire length of each tooth or the full jaw contour, because the film or sensor is placed to capture the crowns and the interproximal spaces, not the roots or the outer jaw outline. They also do not replace periapical radiographs, which are needed to visualize tooth roots and the surrounding periapical tissues for pathologies like root infections or bone lesions.

Bitewings are particularly useful for detecting early proximal caries, so the statement claiming they are not useful for early caries would be inaccurate.