Â­. Â­Dry ice is frozen carbon dioxide. A block of dry ice has a surface temperature of -109.3 degrees Fahrenheit (-78.5 degrees C). Dry ice also has the very nice feature of sublimation -- as it breaks down, it turns directly into carbon dioxide gas rather than a liquid.
The time for a broken collarbone to fully heal depends on the severity of the injury. In children, complete healing may take as little as three to six weeks. In adults, six to 16 weeks or more are often necessary for a collarbone to heal solidly.
The operation involved a 4in incision from the middle of the left side of my collarbone down towards the chest. He would put all the bits of the broken bone together like a jigsaw, and secure it with the plate and screws. Within two days (ten days after the accident), I was admitted to Kingston Hospital for surgery. I woke up afterwards pain-free, with a dressing on the wound and my arm in a sling.