Final answer:
An annual check-up would be considered a routine procedure.
Step-by-step explanation:
A routine procedure refers to a medical or dental procedure that is commonly performed and does not involve significant risks or complications. Out of the options listed, an annual check-up would be considered a routine procedure. This is because an annual check-up is a preventive measure that most individuals undergo on a regular basis to monitor their general health and detect any potential problems early on. On the other hand, the other options listed (Prosthodontics, Endodontics, Orthodontics) are specialized procedures that require specific expertise and are usually performed to address specific dental concerns or conditions.