Does anyone know whether the developed countries like the US and Korea use plaster bandages or polymer bandages over there if a patient has a broken bone?

Plaster is what they used during World War II, and more than a decade ago they started using polymer bandages. It's a liquid that is applied to the fracture and then solidifies into a hard solid after a period of time to hold the fracture in place. Now it seems to use more advanced method, but I don't remember what it is. I hope this helps.