Which radiographic technique is commonly used to minimize distortion and produce accurate images?

• A. Paralleling technique
• B. Bisecting angle technique
• C. Occlusal technique
• D. Panoramic technique

Answer: (A)

Distortion in dental radiographs happens when the tooth, film, and X-ray beam aren’t aligned so the image preserves true size and shape. The paralleling technique tackles this by keeping the receptor parallel to the tooth’s long axis and directing the X-ray beam perpendicular to both. This geometric setup minimizes magnification and distortion, producing a true-to-size image. A film holder or aiming device helps maintain this alignment consistently, which is why this technique is favored for accurate periapical images.

The other techniques involve more variation in geometry: the bisecting angle method uses an angled projection that often causes elongation or foreshortening because the film isn’t parallel to the tooth; the occlusal approach is used for different structures and doesn’t optimize for distortion control; panoramic imaging covers the whole arch but introduces magnification and distortion from the curved focal trough and positioning.

So, the paralleling technique is the best choice for minimizing distortion and yielding accurately dimensioned radiographs.