| A composite resin is a
tooth-colored plastic mixture filled with glass (silicon dioxide).
Introduced in the 1960s, dental composites were confined to the
front teeth because they were not strong enough to withstand the
pressure and wear generated by the back teeth. Since then,
composites have been significantly improved and can be successfully
placed in the back teeth as well. Composites are not only used to
restore decayed areas, but are also used for cosmetic improvements
of the smile by changing the color of the teeth or reshaping
disfigured teeth.
How is a composite placed?
Following preparation, the dentist places the composite in layers,
using a light specialized to harden each layer. When the process is
finished, the dentist will shape the composite to fit the tooth. The
dentist then polishes the composite to prevent staining and early
wear.
How long does it take
to place a composite?
It takes the dentist about 10-20 minutes longer to place a composite
than a silver filling. Placement time depends on the size and
location of the cavity-the larger the size, the longer it will take.
What is the cost?
Prices vary, but composites average about one-and-a-half to two
times the price of a silver filling. Most dental insurance plans
cover the cost of the composite up to the price of a silver filling,
with the patient paying the difference. As composites continue to
improve, insurance companies are more likely to increase their
coverage of composites.
What are the
advantages of composites?
Esthetics are the main advantage, since dentists can blend shades to
create a color nearly identical to that of the actual tooth.
Composites bond to the tooth to support the remaining tooth
structure, which helps to prevent breakage and insulate the tooth
from excessive temperature changes.
What are the
disadvantages?
After receiving a composite, a patient may experience post-operative
sensitivity. Also, the shade of the composite can change slightly if
the patient drinks tea, coffee or other staining foods. The dentist
can put a clear plastic coating over the composite to prevent the
color from changing if a patient is particularly con-cerned about
tooth color. Composites tend to wear out sooner than silver fillings
in larger cavities, although they hold up as well in small cavities.
How long will a
composite last?
Studies have shown that composites last 7-10 years, which is
comparable to silver fillings except in very large restorations,
where silver fillings last longer than composites. |
