Which technique is used to avoid distortion in dental radiographs when the film cannot be positioned parallel to the tooth's long axis?

The bisecting angle technique is employed specifically to address the challenge of obtaining accurate dental radiographs when the film cannot be positioned parallel to the long axis of the tooth. This technique involves positioning the film at an angle to the tooth such that the central ray of the x-ray beam is directed perpendicular to an imaginary line that bisects the angle formed by the long axis of the tooth and the film.

By using this method, it minimizes distortion and ensures a clearer and more accurate representation of the tooth's structure in the radiograph. This technique is particularly useful in cases where the anatomy of the mouth or the positioning of the patient does not allow for ideal film placement. Thus, it effectively compensates for the angle used, helping to achieve a diagnostic image while reducing the likelihood of distortion that can occur when the film is not parallel to the tooth.