Dental Assistant Practice Exam

Which technique is commonly used for bitewing (BWX) exposure when the paralleling technique cannot be utilized?

1. Bisecting Angle Technique

2. Horizontal Technique

3. Vertical Technique

4. Direct Exposure Technique

The correct answer is: Bisecting Angle Technique

The bisecting angle technique is a valuable approach for capturing bitewing radiographs when the paralleling technique cannot be applied. This technique is particularly useful in scenarios where the anatomy of the patient's mouth makes it difficult to position the film or sensor parallel to the long axis of the teeth, such as in cases of a shallow palate or when a patient has other anatomical limitations. In the bisecting angle technique, the film or sensor is placed adjacent to the tooth, and the central ray of the x-ray beam is directed at an angle that bisects the angle formed by the long axis of the tooth and the film. This method allows for an effective capture of the image while minimizing distortion, and it helps to illustrate the interproximal surfaces of the teeth, which is the primary purpose of bitewing radiographs. This technique is favored in situations where the patient cannot comfortably open their mouth wide enough or when anatomical variations prevent the use of other methods. Its ability to produce diagnostic quality images under challenging conditions highlights its significance in dental radiography practice.