Final answer:
A comminuted fracture will require the longest treatment and rehabilitation to restore function.
Step-by-step explanation:
The type of fracture that will require the longest treatment and rehabilitation in order to restore function is a comminuted fracture. A comminuted fracture is a fracture in which the bone breaks into several fragments. This type of fracture often requires surgery to realign the bone and may involve a longer recovery period to restore full function.