ADAA X-Ray Practice Exam

Placing the receptor parallel to the teeth with proper vertical angulation is essential because bitewing radiographs evaluate interproximal contacts and the height of the crestal bone. When the receptor lies parallel to the long axis of the teeth, the X-ray beam can be directed perpendicular to the sensor and square to the contacts. This minimizes geometric distortion, so the spaces between teeth are shown accurately and the crest of the bone is depicted at its true level. If the receptor is tilted toward the cheek or the angulation is off, the contacts can appear smeared or overlapped and the bone height can look misleading, making it hard to assess periodontal status. Using a receptor that’s too small misses part of the posterior region, preventing a complete and accurate view of the interproximal contacts and bone height.