Earthquake Ride (Universal Studios) Washington DC Metro. Sweets is in a subway wreck at the start of the episode. Check out the Earthquake ride portion in this video. in episode 5x15 The Bones on the Blue Line.
A tooth crown is an artificial cap that covers and protects a tooth. A crown completely encases a tooth, starting at the gums. Crowns are used to recondition teeth, improving strength, size, shape and appearance.
The usual reason for placing a crown on a tooth is to reinforce the tooth as it has been broken down by decay, failed fillings etc. Every filling that is done to a tooth places the living element of the tooth under strain - ie the pulp which resides in the root canal system.