ViScan Diagnostics

Orthopantomogram (OPG)

The Orthopantomogram (also known as an orthopantomograph, pantomogram, OPG or OPT) is a panoramic single image radiograph of the mandible, maxilla and teeth. It is often encountered in dental practice and occasionally in the emergency department; providing a convenient, inexpensive and rapid way to evaluate the gross anatomy of the jaws and related pathology.

There are multiple indications for this type of radiograph including yet not limited to :

General dental health evaluation for caries or pulp origin disease
Trauma assessment for tooth or jaw fractures
Infection evaluation of sinusitis, periodontitis or periapical abscesses
Tumor or radicular cyst evaluation
Temporomandibular joint assessment for disease, fractures or dislocations
Facial bone disease evaluation
Foreign body localization
Salivary stone identification (sialolithiasis)
Growth and development monitoring of pediatric teeth for location, shape, angle, supernumerary tooth presence and tooth germ absence to prevent or prepare for future aesthetic issues
Initial and progressive evaluation of orthodontic treatment (note an OPG alone is not usually sufficient for preoperative inspection or prosthesis measurement)

OPG X-ray Can Reveal Dental and Medical Problems Such as:

Cysts/ growth in the jawbones
Bone loss/ advanced periodontal disease
Soft Tissue Screening
Impacted teeth including wisdom teeth
Disorders of temporomandibular joint

The Main Advantages Of Panoramic Images/OPGs are:

Wide coverage of teeth and facial bones including the TMJ (Temporomandibular joint)
Quick and efficient procedure
Ease of examination
Low radiation dose
Can be used for patients who have restricted mouth opening
Useful aid for patient education and case presentation

Patient Position

During an OPG the patient remains in a stationary position (seated or standing) while both the x-ray source and film rotate in combination around the patient. The x-ray source rotates from one side of the jaw, around the front of the patient, and then to the other side of the jaw. The film rotates opposite to the x-ray source behind the patient. It takes a few seconds during which the patient must remain completely still.

Frequent QnA

What should patients expect when they arrive at the practice?

During the OPG the arm of the machine will rotate slowly around the head but will not come into contact with the patient. The Radiographer (a technologist trained in medical and dental imaging) will instruct the patient to bite on a small plastic mouthpiece attached to the machine, which keeps the top and bottom teeth separated and helps position the mouth properly in the machine.

For a Lateral Cephalogram you are required to hold still and bite together on the back teeth. Lips should be relaxed. The Radiographer will help ensure that patients are in the correct position before taking the x-ray.

How long does it take?

The procedure is very brief (about 5 minutes or less) and is painless and simple. It is very important that you follow all instructions and hold absolutely still once positioned.

Is there any special preparation required?

There is no special preparation required and there are no after effects following the scan. Once at the practice, patients will be asked to remove any jewellery or metallic items from the head and neck region, including any piercings, hair accessories, dentures and plates, as these often interfere with x-ray image formation and produce unwanted artefacts.