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Dental x-rays

X-ray - teeth; Radiograph - dental; Bitewings; Periapical film; Panoramic film; Cephalometric x-ray; Digital image

Dental x-rays are a type of image of the teeth and mouth. X-rays are a form of high energy electromagnetic radiation. The x-rays penetrate the body to form an image on film or screen. X-rays can be either digital or developed on a film.

Structures that are dense (such as silver fillings or metal restoration) will block most of the light energy from the x-ray. This makes them appear white in the image. Structures that contain air will be black and teeth, tissue, and fluid will appear as shades of gray.

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How the Test is Performed

The test is performed in the dentist's office. There are many types of dental x-rays. Some of them are:

Many dentists are also taking x-rays using digital technology. These images run through a computer. The amount of radiation given off during the procedure is less than traditional methods. Other types of dental x-rays can create a 3-D picture of the jaw. Cone beam computerized tomography (CBCT) may be used before dental surgery, such as when several implants are being placed.

How to Prepare for the Test

There is no special preparation. You need to remove any metal objects in the area of the x-ray exposure. A lead apron may be placed over your body. Tell your dentist if you might be pregnant.

How the Test will Feel

The x-ray itself causes no discomfort. Biting on the piece of film makes some people gag. Slow, deep breathing through the nose usually relieves this feeling. Both CBCT and cephalometric x-ray do not require any biting pieces.

Why the Test is Performed

Dental x-rays help diagnose disease and injury of the teeth and gums as well as help planning the appropriate treatment.

Normal Results

Normal x-rays show a normal number, structure, and position of the teeth and jaw bones. There are no cavities or other problems.

What Abnormal Results Mean

Dental x-rays may be used to identify the following:

Risks

There is very low radiation exposure from dental x-rays. However, no one should receive more radiation than necessary. A lead apron can be used to cover the body and reduce radiation exposure. Pregnant women should not have x-rays taken unless necessary.

Considerations

Dental x-rays can reveal dental cavities before they are clinically visible, even to the dentist. Many dentists will take yearly bitewings to look for early development of cavities in between the teeth.

Related Information

Impacted tooth
Dental cavities
Periodontitis
Tooth abscess
Broken or dislocated jaw
Malocclusion of teeth

References

Berman LH, Rotstein I. Diagnosis. In: Hargreaves KM, Berman LH, eds. Cohen's Pathways of the Pulp. 11th ed. St Louis, MO: Elsevier; 2016:chap 1.

Brame JL, Hunt LC, Nesbit SP. Maintenance phase of care. In: Stefanac SJ, Nesbit SP, eds. Diagnosis and Treatment Planning in Dentistry. 3rd ed. St Louis, MO: Elsevier; 2017:chap 11.

Parks ET, Aps JK. Radiographic techniques. In: Dean JA, ed. McDonald and Avery's Dentistry for the Child and Adolescent. 10th ed. St Louis, MO: Elsevier; 2016:chap 2.

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Review Date: 2/5/2018  

Reviewed By: Ilona Fotek, DMD, MS, Dental Healing Arts, Jupiter, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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