The Smithsonian often plays a small role on the small screen, and those references are revealing about popular stereotypes of the Smithsonian. For many TV series, the standard destination for something old and dilapidated is, of course, the Smithsonian.
1 The part of the tooth that is visible in the mouth, above the gum line on lower teeth and below the gum line on upper teeth, is called the clinical crown.  A cemented restoration that partially or completely covers the outside of the clinical crown is referred to as a dental crown or cap.
The definition of crown is to give someone power, or to place a ceremonial headdress on a person's head. When you recognize a new person as king, this is an example of when you crown him. a garland or wreath worn on the head as a sign of honor, victory, etc.