What would typically appear on a bitewing radiograph?

A bitewing radiograph is specifically designed to capture the crowns of the upper and lower teeth in one area of the mouth, typically focusing on the posterior teeth. This type of radiograph is particularly effective for detecting caries (cavities), assessing the interproximal spaces between adjacent teeth, and evaluating the health of the supporting bone structures.

The correct answer highlights that a bitewing radiograph shows alveolar crest and faulty restorations. The alveolar crest is the uppermost part of the alveolar bone, which is crucial for dental health since it supports the teeth. The radiograph helps in assessing the level of the alveolar crest, which can indicate periodontal health, while also allowing the dentist to identify any faulty restorations, such as those that may be leaking or improperly placed.

In contrast, the other options do not align with the purpose of a bitewing radiograph. TMJ alignment pertains more to images taken to assess the temporomandibular joint, while sinus cavities and wisdom teeth position are typically evaluated using different types of imaging, such as panoramic radiographs or cone beam CT scans, which are better suited for examining broader anatomical features.