Dental x-rays

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Development of baby teeth

Development of permanent teeth

Tooth anatomy

Dental x-rays are a type of picture of the teeth and mouth. X-rays are a form of electromagnetic radiation, just like visible light. They are of higher energy, however, and can penetrate the body to form an image on film.

Structures that are dense (such as silver fillings or metal restoration) will block most of the photons and will appear white on developed film. Structures containing air will be black on film, and teeth, tissue, and fluid will appear as shades of gray.

X-ray - teeth

The test is performed in the dentist's office. There are 2 types of x-rays: bite-wing and periapical.  The bite-wing is when the patient bites on a paper tab and shows the crown portions of the top and bottom teeth together. The periapical shows one or two complete teeth from crown to root.  In addition, there is a method of x-ray called digital that many dentists are using now.  The image runs through a computer and the amount of radiation transmitted during the procedure is less than traditional methods.

The x-ray machine is aimed at one section of teeth when a picture is taken. Most dental x-rays include four or more views of the teeth.

There is no special preparation. Notify the dentist if you are pregnant.

The x-ray itself causes no discomfort. Some people find that biting on the piece of film makes them gag; slow, deep breathing through the nose usually relieves this feeling.

Dental x-rays help diagnose disease and injury of the teeth and gums. 

Review Date: 08/12/2005
Reviewed By: Johanna Jacobs, D.D.S., General and Cosmetic Dentistry, New York, NY. Review provided by VeriMed Healthcare Network.