Final answer:
A sugar-tong splint or a volar splint is commonly used for distal radius and ulna fractures, such as a Colles fracture. In more severe cases, metal pins and wires may be surgically inserted to hold the bones in place.
Step-by-step explanation:
The type of splint typically used for distal radius and ulna fractures, including a Colles fracture, is referred to as a sugar-tong splint or a volar splint. When surgery is required for a severe fracture, a system of metal pins and wires may be used to maintain the correct anatomical alignment during healing, as demonstrated by the described x-rays of a broken upper part of the ulna. The Colles fracture, which is a complete transverse fracture across the distal radius, often requires a splint or cast that maintains the wrist and forearm in proper alignment to allow for adequate healing, especially if the fracture involves the radiocarpal joint of the wrist which can affect wrist function.