Final answer:
A cephalometric radiograph is taken in orthodontics to study and make measurements of the skull and analyze growth patterns.
Step-by-step explanation:
In orthodontics, the radiograph that is taken to study and make measurements of the skull and analyze growth patterns is called a cephalometric radiograph. Cephalometric radiographs are commonly used to evaluate facial structures, dental relationships, and growth patterns in orthodontic treatment planning. They provide valuable information for diagnosing and assessing skeletal and dental discrepancies. Orthodontists use cephalometric analysis to make measurements and study various angles and proportions. This information helps in treatment planning, especially for orthodontic interventions such as braces or other corrective measures.