What is the proper patient positioning for bitewing radiographs?

The proper patient positioning for bitewing radiographs involves aligning the ALA-tragus line parallel to the floor. This positioning is crucial because it helps to ensure that the radiographic image captures the appropriate areas of the posterior teeth, which are typically the primary focus of bitewing films. The ALA-tragus line is an anatomical reference line drawn from the ala (wing) of the nostril to the tragus of the ear, and when this line is parallel to the floor, it facilitates optimal vertical angulation of the X-ray beam.

By positioning the patient in this way, the chances of getting a clear and diagnostic image are increased, as it minimizes the distortion and superimposition of anatomical structures that may occur with incorrect alignment. This positioning technique is designed to ensure that both the maxillary and mandibular teeth are adequately represented in the bitewing view, particularly the interproximal areas, which are critical for detecting caries and assessing periodontal health.