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Dental crown or cap is
used for restoring lost
tooth structure. These
are some of the
indications for a dental
crown:
.
Loss of tooth structure
beyond 50%
.
History of root canal
treatment on a tooth
. Using the tooth
as an anchor for a
bridge
.
History of multiple
fractures on a tooth
. Restoring high
pressure areas of a
tooth
. As part
of bite (occlusal)
correction for the mouth
. Some cosmetic
cases
Regardless
of the indication,
dental crowns can come
in different forms. The
most common type of a
dental crown is called
Porcelain-fused-to-metal.
This type of dental
crown consists of a
metal core (coping) with
porcelain on the top.
The metal framework
gives the crown strength
and the porcelain
improves the esthetics.
In recent years with
introduction of new
porcelain injection
techniques and also
CAD-CAM technology that
allows creating a crown
out of a porcelain
block, new full
porcelain crowns have
been introduced to the
market.
While
these type of crowns
offer superb cosmetic
results, their strength
and durability is still
under evaluation.
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