| 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. |