Tooth crown is a term that is used to describe the visible portion of the tooth in your mouth. This is also called the clinical crown. Sometimes, this portion of the tooth has to be trimmed to fit a “cap” on it. This cap is referred to as the crown of the tooth. The cap can be made of metal, ceramic or a combination of both metal and ceramic. The cap is generally fitted on a tooth that has undergone RCT. At times as a part of a fixed bridge, the cap fits on the supporting tooth called the abutment.