Which machine is used to expose an extraoral film for large areas of the oral cavity?

The machine specifically designed to expose an extraoral film for large areas of the oral cavity is the panoramic machine. This type of radiography is particularly useful because it captures a wide view of the teeth, jaws, and surrounding structures in a single image, making it easier to assess various dental conditions and plan treatments. Unlike intraoral films, which are limited to small portions of the mouth, the panoramic machine uses a rotating head to create a comprehensive view, accommodating the full dental arch and both the upper and lower jaws in one exposure.

Intraoral cameras are primarily used for capturing detailed images of individual teeth or small sections of the mouth, which is not suitable for whole jaw imaging. The X-ray developer, while essential for processing the films after exposure, does not play a role in the actual exposure or capturing of images. The dental chair is designed for patient comfort during examinations and procedures, but it does not function as a diagnostic imaging device. Thus, the panoramic machine is the correct choice for obtaining extraoral films of large areas of the oral cavity.