BDA Radiography for Dental Nurses 2025 – 400 Free Practice Questions to Pass the Exam

In the bisected angle technique for periapical radiography, the main beam angle is primarily determined by the alignment of the image receptor and the tooth being imaged. This technique involves positioning the film at a specific angle to the long axis of the tooth and then bisecting the angle formed between the receptor and the tooth to determine the direction of the X-ray beam.

By focusing on the alignment, the practitioner ensures that the radiograph accurately represents the tooth and surrounding structures, minimizing distortion and producing a clearer image. This precision is crucial for diagnosing conditions and planning treatments effectively.

The other factors, while potentially relevant to the overall process of radiography, do not directly influence the determination of the main beam angle in the bisected angle technique. For example, the shape of the dental arch and the patient's height may affect other aspects of imaging but not the specific mechanics of aligning the film and setting the beam angle for this particular technique.