Which radiographic projection is MOST useful for assessing the level of the alveolar crest?

Correct answer: B. Vertical bitewing

• A. ❌ Panoramic images have inherent magnification and distortion and poor resolution in the anterior region — unsuitable for measuring crestal levels.
• B. ✅ CORRECT — The VERTICAL bitewing orients the receptor along its long axis, capturing several millimeters more crestal bone than a horizontal bitewing. It is the projection of choice when bone loss exceeds what a horizontal bitewing can display, and it keeps the beam perpendicular to the crest for an undistorted bone level.
• C. ❌ Periapicals show the full root and apex and are valuable adjuncts, but geometric distortion makes them less reliable than bitewings for crest measurement.
• D. ❌ The horizontal bitewing is excellent for interproximal caries and for MINIMAL bone loss, but it crops the image before moderate-to-severe crestal loss can be seen.

Note: Rule of thumb: caries → horizontal bitewing; bone levels in a periodontitis patient → vertical bitewing.