Final answer:
The patient's head is upright for maxillary films and tilted for the mandibular arch.
Step-by-step explanation:
When taking periapical x-rays, the patient's head is upright for maxillary films and tilted for the mandibular arch.
Periapical X-rays, also known as intraoral radiographs, are a type of dental X-ray that provides a detailed view of a specific tooth and its surrounding structures. These X-rays are commonly used in dentistry to diagnose and monitor various dental conditions. Periapical X-rays capture images of the entire tooth, from the crown to the root tip, as well as the surrounding bone.