Overview of bitewing radiograph(What it is)
A bitewing radiograph is a dental X-ray view that shows the crowns of the upper and lower back teeth on the same image.
It is commonly used in routine dental checkups to look for tooth decay between teeth and to evaluate existing restorations.
The image is taken while the patient gently bites on a small holder or tab to keep the sensor/film in place.
It is typically performed in general dentistry, hygiene visits, and preventive care appointments.
Why bitewing radiograph used (Purpose / benefits)
A bitewing radiograph is designed to reveal areas that are hard to see with a visual exam alone—especially the tooth-to-tooth contact points where “between-the-teeth” cavities can start. Even with good lighting, mirrors, and careful inspection, the sides of teeth that touch one another can hide early decay.
Common purposes and benefits include:
- Detecting interproximal caries (cavities between teeth). These lesions may not be visible clinically until they become larger.
- Assessing recurrent decay around restorations. Fillings and crowns can develop decay at their margins; a bitewing radiograph can help evaluate those edges.
- Evaluating the fit and contour of restorations. Overhangs or open margins may be suspected when symptoms or clinical signs are present.
- Monitoring bone levels around teeth. Bitewings often include the crestal bone (the top of the jawbone between teeth), helping clinicians screen for patterns consistent with periodontal bone loss.
- Supporting treatment planning. Findings may guide decisions about preventive measures, restoration repair/replacement, or further imaging.
Overall, the bitewing radiograph helps “fill in the blind spots” of the clinical exam by providing a two-dimensional view through the teeth and supporting structures.
Indications (When dentists use it)
Dentists commonly use a bitewing radiograph in situations such as:
- Routine preventive visits, especially when caries risk is moderate or high (frequency varies by clinician and case)
- Suspected cavities between posterior teeth (premolars and molars)
- Monitoring previously detected early lesions over time
- Evaluating existing fillings, crowns, and their margins
- Checking for food-trap areas or suspected overhanging restorations
- Screening crestal bone levels as part of periodontal assessment
- Before and after certain restorative procedures, when documentation is needed (varies by clinician and case)
- When symptoms suggest possible decay but the tooth surface looks intact
Contraindications / when it’s NOT ideal
A bitewing radiograph is not always the most suitable image, depending on anatomy, symptoms, or patient tolerance. Situations where it may be limited or another imaging approach may be preferred include:
- Severe gag reflex or inability to tolerate intraoral sensors/film
- Limited ability to bite or hold still, such as acute jaw pain, limited opening, or certain neuromuscular conditions
- Very young children or special care situations where a standard bitewing position is not achievable (alternative techniques may be used)
- Assessment needs beyond crowns and crestal bone, such as:
- Suspected root tip infection (periapical radiograph often provides more relevant detail)
- Impacted teeth or broader jaw evaluation (panoramic imaging may be considered)
- Complex three-dimensional questions (CBCT may be considered when clinically justified)
- When contact points are not clearly captured due to overlapping—repositioning or a different view may be needed
- When the primary question is soft tissue or surface detail, where clinical exam, photographs, or other adjuncts may be more informative
Radiographs are typically taken only when there is a diagnostic need; the decision and timing vary by clinician and case.
How it works (Material / properties)
Some commonly discussed “material properties” (like flow, viscosity, filler content, and curing) apply to dental filling materials, not to a bitewing radiograph. A bitewing radiograph is an imaging procedure, so different technical factors matter.
Closest relevant properties for bitewing imaging include:
-
Image receptor type (film vs digital sensor vs phosphor plate).
This affects workflow, image processing, and how quickly the image is available. Digital systems allow image enhancement (such as adjusting brightness/contrast), but they do not replace proper positioning. -
Spatial resolution and contrast.
Resolution influences how clearly fine details appear (for example, small changes at restoration margins). Contrast helps differentiate enamel, dentin, restorations, and bone. -
Exposure and beam alignment.
The X-ray beam passes through teeth and bone and is “attenuated” (weakened) depending on density. Enamel blocks more X-rays than dentin; caries and some defects may appear more radiolucent (darker). Proper horizontal angulation helps avoid overlapping contact points. -
Artifacts and technique sensitivity.
Patient movement, improper receptor placement, and angulation errors can reduce diagnostic value. Bitewing technique is generally straightforward, but small positioning errors can affect whether the most important areas are visible.
bitewing radiograph Procedure overview (How it’s applied)
The terms below (Isolation → etch/bond → place → cure → finish/polish) are traditionally used to describe steps in placing tooth-colored fillings, not taking radiographs. For a bitewing radiograph, the closest parallel is the imaging workflow and how the receptor is positioned and the image is captured.
A simplified, general overview looks like this:
-
Isolation
In radiography, “isolation” most closely corresponds to preparing the area for imaging: removing removable appliances if needed, positioning the patient, and reducing common obstructions (like the tongue or cheek) to help stabilize the receptor. -
Etch/bond
Not applicable to a bitewing radiograph. Etching and bonding relate to adhesive dentistry (restorations), not imaging. -
Place
The clinician places the bitewing receptor (sensor/film/phosphor plate) using a holder or tab and asks the patient to bite gently to keep it stable. Placement aims to capture the crowns and the crestal bone level without cutting off important anatomy. -
Cure
Not applicable in the restorative sense (light-curing resin). In imaging, the closest equivalent is the X-ray exposure, which is a brief activation of the X-ray unit to create the image. -
Finish/polish
Not applicable as a tooth-finishing step. The closest equivalent is image review and optimization (checking for overlap, missing anatomy, or motion blur) and retaking the image only if diagnostically necessary.
Exact steps and equipment vary by clinic and by the receptor system used.
Types / variations of bitewing radiograph
Bitewing radiographs come in several common variations, typically defined by receptor type and positioning:
-
Horizontal bitewings
Common in routine caries detection. They emphasize the crowns of posterior teeth and the interproximal contacts. -
Vertical bitewings
Often used when more of the supporting bone level needs to be visualized (for example, when periodontal bone assessment is a priority). -
Film-based vs digital bitewings
- Film: Requires chemical processing. Workflow can be slower and technique errors may be discovered after processing.
- Digital sensors (solid-state): Provide immediate images and are widely used.
-
Phosphor storage plates (PSP): Thin and more flexible than many sensors; scanned after exposure.
-
Bitewing tabs vs positioning devices (holders/rings)
Holders can help standardize angulation and reduce overlap, while tabs may be used in some settings depending on preference and patient comfort. -
Pediatric vs adult sizes
Receptor size is selected based on patient anatomy and comfort while aiming to capture diagnostically useful anatomy.
Note: Variations such as low vs high filler, bulk-fill flowable, and injectable composites refer to restorative filling materials and are not types of bitewing radiograph.
Pros and cons
Pros:
- Helps detect cavities between posterior teeth that may not be visible clinically
- Useful for evaluating existing restorations and suspected recurrent decay
- Can show crestal bone levels to support periodontal screening
- Generally quick to capture once the receptor is positioned
- Widely available in general dental settings
- Standardized view that supports comparison over time when technique is consistent
- Digital systems allow image storage and review without physical film handling
Cons:
- Technique sensitivity: poor angulation can cause overlapping contacts and limit interpretation
- Intraoral placement may be uncomfortable for some patients (gag reflex, tori, limited opening)
- Two-dimensional image: depth and exact lesion extent can be difficult to judge from a single view
- Does not fully evaluate tooth roots and root tips (other views may be needed)
- Metal restorations and certain materials can obscure adjacent areas or create visual complexity
- Movement can blur the image, reducing diagnostic usefulness
- As with all X-rays, it involves radiation exposure; imaging is typically justified by diagnostic need (varies by clinician and case)
Aftercare & longevity
Because a bitewing radiograph is an image (not a filling or appliance), “aftercare” mainly relates to comfort, record-keeping, and how long the image remains clinically useful.
General considerations include:
- Immediate comfort: Most people can resume normal activities right away. Mild gum or soft-tissue irritation from the receptor edge can occur in some cases and typically resolves without special measures.
- Image longevity (clinical usefulness): How long a bitewing radiograph remains a useful reference depends on changes in oral health over time. New decay, replacement restorations, shifting contacts, and periodontal changes can make older images less representative.
- Need for repeat imaging: The timing of repeat bitewings varies by clinician and case and is commonly based on caries risk, past disease history, symptoms, and clinical findings.
- Quality factors: Good positioning and minimal overlap make an image more useful for future comparisons. Poor-quality images may have limited value even shortly after they are taken.
- Oral health factors: Bite forces, bruxism (teeth grinding), home care, diet, and regular dental evaluations can influence the likelihood of new findings that would warrant updated imaging.
Alternatives / comparisons
A bitewing radiograph answers specific questions well, but it is not the only diagnostic tool. Alternatives or complementary options may be used depending on the clinical goal.
- Bitewing radiograph vs periapical radiograph
- Bitewing: Emphasizes crowns, interproximal areas, and crestal bone.
-
Periapical: Shows the entire tooth from crown to root tip and surrounding bone; often preferred for evaluating root-related pain, infection, or trauma.
-
Bitewing radiograph vs panoramic radiograph
- Bitewing: Higher detail for interproximal caries and restoration margins in the posterior teeth.
-
Panoramic: Broad overview of jaws and teeth; less detailed for small cavities between teeth.
-
Bitewing radiograph vs CBCT (cone-beam CT)
- Bitewing: Two-dimensional, commonly used for caries detection and routine assessment.
-
CBCT: Three-dimensional information for specific indications (e.g., surgical planning, complex anatomy) when clinically justified; not a routine substitute for bitewings.
-
Bitewing radiograph vs clinical exam and adjunctive methods
- Clinical exam: Essential baseline; can identify visible cavities, cracks, and gum inflammation.
- Adjuncts (varies by clinic): Transillumination, caries-detection devices, and intraoral photos may add information, but they do not replace radiographs in many interproximal scenarios.
Note: Comparisons like flowable vs packable composite, glass ionomer, and compomer are comparisons among restorative filling materials rather than imaging methods, so they are not direct alternatives to a bitewing radiograph. However, bitewing images are often used to evaluate these restorations after placement and during follow-up.
Common questions (FAQ) of bitewing radiograph
Q: What does a bitewing radiograph show?
It typically shows the crowns of upper and lower back teeth in one view, including the contact areas between teeth. It can also show the crestal bone level between teeth, depending on positioning.
Q: Is a bitewing radiograph painful?
Most people find it mildly uncomfortable rather than painful. Discomfort usually comes from the sensor/film edge or the need to hold a steady bite for a short time, and tolerance varies by person.
Q: How long does it take to get bitewing radiographs?
The exposure itself is brief, and the full process is often completed within minutes. Total time depends on how many images are needed and how easily the receptor position is tolerated.
Q: How many bitewing radiographs are taken?
The number varies by clinician and case. It commonly depends on whether the goal is to image only posterior contacts, include more bone, or monitor specific areas.
Q: Are bitewing radiographs safe?
Dental X-rays use low doses and are typically taken only when there is a diagnostic reason. Safety practices (like appropriate technique and protective measures) are part of routine radiographic protocols, and the decision to take images varies by clinician and case.
Q: Can a bitewing radiograph detect all cavities?
No. Bitewings are especially helpful for cavities between teeth and for some recurrent decay around restorations. Cavities on chewing surfaces, along the gumline, or on front teeth may require clinical evaluation and/or different images to assess well.
Q: Do bitewing radiographs show gum disease?
They can show patterns consistent with bone loss between teeth, which is one component of periodontal assessment. Gum disease evaluation also relies on clinical probing measurements, inflammation signs, and overall periodontal charting.
Q: What affects the cost of a bitewing radiograph?
Cost varies by region, clinic, and whether the images are part of an exam bundle or a separate service. It can also vary by imaging technology (film vs digital) and how many images are taken.
Q: How long do bitewing radiographs “last” before needing new ones?
The images remain part of the dental record, but how long they stay clinically current depends on changes in oral health and risk factors. The interval for new bitewings varies by clinician and case.
Q: What if my bitewing radiograph is unclear or shows overlapping teeth?
Overlapping contact points can happen if angulation or positioning is off, which can limit interpretation. In some situations, the clinician may retake the image to obtain a diagnostically useful view, balancing the need for clarity with minimizing repeat exposures.