What is the main purpose of proper occlusal plane alignment in radiographs?

• A. To maximize bite force during imaging.
• B. To ensure consistent geometry, reduce distortion, and improve reproducibility of measurements.
• C. To minimize radiation exposure to the tongue.
• D. To allow a wider field of view.

Answer: (B)

Proper occlusal plane alignment creates a consistent, predictable orientation of the teeth and jaws relative to the image receptor and X-ray beam. When this plane is kept parallel to the film (and the beam is directed to minimize tilt), geometric magnification and angular distortion are reduced, so measurements taken on the radiograph are more accurate and reproducible. This is crucial for orthodontic assessment and treatment planning, as well as for comparing images over time to gauge changes. The other options don’t relate to image geometry or measurement reliability: bite force isn’t the imaging goal, tongue exposure isn’t controlled by occlusal plane alignment, and widening the field of view isn’t achieved by how the occlusal plane is positioned.