
When X-rays pass through your mouth during a
dental exam,
more X-rays are absorbed by the denser parts (such as teeth and bone)
than by soft tissues (such as cheeks and gums) before striking the film.
This creates an image on the radiograph. Teeth appear lighter because
fewer X-rays penetrate to reach the film. Cavities and gum disease
appear darker because of more X-ray penetration. The interpretation of
these X-rays allows the
dentist to safely and accurately detect hidden abnormalities.
How often
dental X-rays
(radiographs) should be taken depends on the patient`s individual
health needs. It is important to recognize that just as each patient is
different from the next, so should the scheduling of X-ray exams be
individualized for each patient. Your medical and dental history will be
reviewed and your mouth examined before a decision is made to take
X-rays of your teeth.
The schedule for needing radiographs at
recall visits varies according to your age, risk for disease and signs
and symptoms. Recent films may be needed to detect new cavities, or to
determine the status of gum disease or for evaluation of growth and
development. Children may need X-rays more often than adults. This is
because their teeth and jaws are still developing and because their
teeth are more likely to be affected by tooth decay than those of
adults.