A crown (cap) is a restoration
that is placed on teeth that have lost a lot of their
structure. There are many different types of crowns, full porcelain, porcelain
fused to metal, full metal crowns... Your dentist will explain the advantage and
disadvantage of each kind for you.
The
process of making a crown includes many steps that start in our office
with
preparing the teeth and taking impressions from the tooth/teeth involved.
Then a temporary crown or bridge is placed on your teeth.
The impressions
are sent to the lab. In the lab a mold of the teeth is poured and the work
begins. 
There are multiple steps and different technicians work on the mold
to fabricate a crown or bridge. The completed work is sent back to the
office and after necessary checks and adjustments it is cemented onto your
teeth.