A dental crown is a tooth-shaped " porcelain cap" that is placed over a tooth to restore its shape and size, strength, and improve its appearance.

It typically takes two separate appointments for a dentist to place a dental crown.
The first appointment involves:

Preparing (shaping) the tooth
Taking its impression
Placing a temporary crown.
The time needed to perform these steps can about an hour.During the time period between the two appointments, a dental laboratory will fabricate the crown. Two weeks or so are usually allotted for this process.

When the patient returns for their second visit, the dentist will cement the finished crown into place. This step can usually be completed in about 45 minutes or so.