Final answer:
The headrest of a dental chair supports the occipital bone of the skull and the cervical vertebrae of the neck, providing stability, comfort, and protection during dental procedures.
Step-by-step explanation:
The design of a dental chair involves a headrest that primarily supports the occipital bone of the cranium at the back of the skull and the cervical vertebrae of the neck. The cranium consists of 22 bones, which include the cranial bones that form the brain case and the facial bones. The cranial bones provide structural support for the face and protection for the brain, while the cervical vertebrae are part of the vertebral column that supports the head, protects the spinal cord, and provides attachment points for muscles.
The headrest of the dental chair aims to stabilize these regions to ensure comfort and safety during dental procedures. The bones most affected while a patient is reclining in a dental chair are the occipital bone at the base of the skull, which rests against the headrest, and the cervical vertebrae, which are aligned with the spine to minimize stress and provide optimal support. The configuration of these bones is essential for supporting the head and neck in a stable position, preventing movement during dental treatments, and providing comfort for the patient.