A temporary crown (provisional crown, interim crown) is short term crown used in dentistry. It serves until a final (definitive) restoration can be inserted. The temporary crowns are shaped by the dentist to form a tooth shape that protects the prepared tooth, prevents damage to the periodontal tissues (gums) and disguises the prepared tooth to a degree until the definitive crown can be made by a dental technician. These crowns come preformed to industry standard shapes and sizes.  This does not mean they are meant to fit every patient right out of the box.  A temporary crown will usually be cemented in place with a soft temporary dental cement. This allows for easy removal when fitting the definitive restoration.