
What Are Sealants?
Sealants
What is a sealant?
A dental sealant is a thin plastic film painted on the chewing surfaces of molars
and pre-molars (the teeth directly in front of the molars). Sealants have been
shown to be highly effective in the prevention of cavities. They were developed
through dental research in the 1950s and first became available commercially in
the early 1970s. The first sealant was accepted by the American Dental Association
Council on Dental Therapeutics in 1972.
How effective are sealants?
Scientific studies have proven that properly applied sealants are 100 percent
effective in protecting the tooth surfaces from caries. Because sealants act as
a physical barrier to decay, protection is determined by the sealants’ ability
to adhere to the tooth. As long as the sealant remains intact, small food particles
and bacteria that cause cavities cannot penetrate through or around a sealant.
In fact, research has shown that sealants actually stop cavities when placed on
top of a slightly decayed tooth by sealing off the supply of nutrients to the
bacteria that causes a cavity. Sealant protection is reduced or lost when part
or all of the bond between the tooth and sealant is broken. However, clinical
studies have shown that teeth that have lost sealants are
no more susceptible to tooth decay than teeth that were never sealed.
Are sealants covered by insurance?
Although insurance benefits for sealant procedures have increased considerably,
coverage is still minimal. The trend is toward expanded coverage of this benefit,
especially as companies start to realize that sealants are a proven preventive
technique. This preventive measure can help reduce future dental expenses and
protect the teeth from more aggressive forms of treatment.
How are sealants applied?
Sealant application involves cleaning the surface of the tooth and rinsing the
surface to remove all traces of the cleaning agent. An etching solution or gel
is applied to the enamel surface of the tooth, including the pits and grooves.
After 15 seconds, the solution is thoroughly rinsed away with water. After the
site is dried, the sealant material is applied and allowed to harden by using
a special curing light. Other sealants are applied and allowed to harden much
the same way nail polish is applied to fingernails. Sealant treatment is painless
and could take anywhere from five to 45 minutes to apply, depending on how many
teeth need to be sealed. Sealants must be applied properly for good retention.
How long will a sealant last?
Sealants should last five years, but can last as long as 10 years. One study reported
that seven years after application, an impressive 49 per-cent of treated teeth
were still completely covered. Sealants should not be considered permanent. Regular
dental check-ups are necessary to monitor the sealants’ bond to the tooth.
Who should receive sealant treatment?
Children, because they have newly erupted, permanent teeth, receive the greatest
benefit from sealants. The chewing surfaces of a child’s teeth are most
susceptible to cavities and the least benefitted by fluoride. Surveys show that
approximately two-thirds of all cavities occur in the narrow pits and grooves
of a child’s newly erupted teeth because food particles and bacteria cannot
be cleaned out.Other patients also can benefit from sealant placement, such as
those who have existing pits and grooves susceptible to decay. Research has shown
that almost everybody has a 95 percent chance of eventually experiencing cavities
in the pits and grooves of their teeth.
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SOURCES: American Dental Association; the National Institute of Dental Research;
Leslie V. Margens, DDS, MPH, professor and chair of the Department of Health
Ecology,School of Dentistry, University of Minnesota, Minneapolis; Leonard Cohen,
DDS, MpH, MS, associate professor and chair of the Department of Education and
Instructional Resources, Baltimore College of Dental Surgery, University of
Maryland at Baltimore.


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