Despite the ‘full mouth X-ray’ label, an OPG is not a series of individual tooth films. It is a single panoramic image that captures both jaws, all your teeth, the temporomandibular joints (TMJ), and parts of the sinuses in one 10–20 second rotation. Understanding this distinction before your dental visit sets realistic expectations about what the scan can — and cannot — show.
What exactly is an OPG — and why ‘full mouth X-ray’ is misleading
An orthopantomogram (OPG), also called a panoramic radiograph, produces one wide, two-dimensional view of your entire mouth. The machine rotates around your head while a narrow X-ray beam sweeps across both jaws, creating a single flattened image of the upper and lower teeth, the jawbones, the TMJs, and the lower portion of the sinuses.
The ‘full mouth X-ray’ label is misleading because it suggests a complete set of close-up films of every tooth. In reality, an OPG is a broad overview. It shows the whole dentition at once, but at a lower resolution than periapical X-rays, which zoom into two or three teeth at a time. For early cavities, fine root details, or subtle bone changes around a single tooth, your dentist will still need intraoral films. OPG is a screening and planning tool, not a substitute for a clinical examination.
When does a dentist or oral surgeon recommend an OPG?
A dentist or oral surgeon typically prescribes an OPG when a clinical problem or treatment plan needs a wider view of the jaws. Common reasons include:
- Impacted wisdom teeth — checking their position and relation to the inferior alveolar nerve before removal
- Orthodontic evaluation — assessing tooth position, eruption patterns, and jaw relationships before braces
- Implant planning — evaluating bone height and anatomical landmarks for dental implants
- Unexplained jaw pain or swelling — looking for cysts, tumors, or other lesions
- Facial trauma — assessing fractures of the jaws and facial bones
- Sinus screening — checking the lower sinuses for pathology
An OPG is not needed for every routine check-up. Your dentist will decide based on clinical findings, not as a default annual scan.
| Feature | OPG (panoramic) | Periapical X-ray |
|---|---|---|
| Field of view | Both jaws, all teeth, TMJs, sinuses | 2–3 teeth and their roots |
| Resolution | Moderate — overview quality | High — fine detail |
| Caries (cavity) detection | Poor — early lesions often missed | Excellent |
| Radiation dose | Low (single exposure) | Very low per film |
| Time | 10–20 seconds | 1–2 minutes per film |
| Patient comfort | Good — ideal for gag reflex | May trigger gag reflex |
How is the scan done — and what preparation do you need?
An OPG is quick and painless. You stand or sit with your chin resting on a support, bite on a plastic block to separate your teeth, and hold still while the machine rotates around your head for 10–20 seconds. The radiographer or dental assistant steps behind a screen during the exposure.
Preparation is minimal: remove metal objects — jewellery, glasses, earrings, and dentures with metal clasps — that could create artifacts on the image. You do not need to fast. Contrast material is rarely used for OPG, so eating beforehand is fine unless your dentist specifically says otherwise.
Is OPG safe? Radiation dose and pregnancy precautions
An OPG uses ionizing radiation, so it is not ‘zero risk,’ but the dose is low — roughly comparable to a few days of natural background radiation and significantly less than a CT scan of the jaws. Digital machines generally deliver lower doses than film-based systems. The exact dose varies with the machine, settings, and your size, so ask your radiologist for the specific figure at your facility if you are concerned.
Radiographers follow the ALARA principle — As Low As Reasonably Achievable — using the smallest exposure that gives a diagnostic image. Lead aprons and thyroid collars are used in many centers, though modern guidelines note they may not be needed for panoramic imaging when the machine is properly collimated; local protocols vary.
If you are pregnant or may be pregnant, tell your dentist and radiographer before the scan. Routine dental X-rays are usually deferred during pregnancy unless clinically necessary, and shielding can be used when an OPG is genuinely required.
How much does an OPG cost in Bangladesh?
OPG is widely available in Dhaka, Chattogram, and other major cities at dental colleges, private diagnostic centers, and specialized dental clinics. Prices vary by city, facility quality, and whether the machine is digital or film-based. The ranges below are typical private-sector estimates — always confirm the current price before booking, as costs change and packages differ.
| Item | Approx. BDT range | Notes |
|---|---|---|
| OPG (digital) — private diagnostic center | ৳800 – ৳1,500 | Most common; includes printed report or CD |
| OPG (film-based) — smaller lab | ৳600 – ৳1,000 | Less common; lower image quality |
| OPG at dental college or hospital | ৳1,000 – ৳2,500 | May include specialist consultation |
| OPG with additional views or report | ৳1,200 – ৳2,500 | Price depends on package and facility |
Costs change over time and vary between facilities — confirm the current rate with the lab or hospital before you book.
Find dentists and dental clinics by division in Bangladesh
An OPG is usually prescribed by a dentist or oral surgeon, so start with a clinical consultation before booking the scan. If you need a dentist or dental clinic in your division, use the directory below.
| Division | Find listings |
|---|---|
| Dhaka | Find dentists in Dhaka |
| Chattogram | Find dentists in Chattogram |
| Khulna | Find dentists in Khulna |
| Rajshahi | Find dentists in Rajshahi |
| Rangpur | Find dentists in Rangpur |
| Sylhet | Find dentists in Sylhet |
| Barishal | Find dentists in Barishal |
| Mymensingh | Find dentists in Mymensingh |
Frequently Asked Questions
Can an OPG detect cavities and gum disease?
An OPG can reveal larger cavities, advanced gum disease (bone loss around teeth), impacted teeth, cysts, and other structural issues. However, small or early-stage cavities between teeth are often missed because the image is a single panoramic view, not a close-up. For precise cavity detection, your dentist may still need small intraoral X-rays (bitewings or periapicals). Think of the OPG as a wide-angle screening tool — it gives an overview, but not every detail.
How often should I have an OPG done?
There is no fixed schedule for an OPG. It is not a routine annual scan like a check-up. Your dentist or oral surgeon will recommend one only when there is a specific clinical need — for example, before wisdom tooth removal, dental implant placement, orthodontic planning, or if you have unexplained jaw pain or swelling. In most cases, a single OPG is enough for years unless your condition changes. Always follow your clinician’s advice; unnecessary scans are avoided to limit radiation exposure.
Is an OPG the same as a CBCT (3D scan)?
No. An OPG (orthopantomogram) is a 2D panoramic image that shows both jaws and teeth in a single flat view. A CBCT (cone beam computed tomography) is a 3D scan that provides cross-sectional images, allowing your dentist to see bone density, nerve canals, and exact tooth positions in three dimensions. CBCT is typically used for complex procedures like implant placement, impacted tooth surgery, or root canal assessment. It delivers a higher radiation dose than an OPG and is only prescribed when the extra detail is truly needed.
Sources
The following sources are from international journals, government health agencies, or recognized medical organizations:
- World Health Organization — Orthopantomogram (OPG / Full Mouth X-Ray) (who.int)
- MedlinePlus — Orthopantomogram (OPG / Full Mouth X-Ray) (medlineplus.gov)
- CDC — Orthopantomogram (OPG / Full Mouth X-Ray) (cdc.gov)
- NHS — Orthopantomogram (OPG / Full Mouth X-Ray) (nhs.uk)
- PubMed — Orthopantomogram (OPG / Full Mouth X-Ray) (pubmed.ncbi.nlm.nih.gov)
- Mayo Clinic — Orthopantomogram (OPG / Full Mouth X-Ray) (mayoclinic.org)
