What Is Digital X-Ray Imaging?
Digital x-ray imaging is a method of capturing dental images using an electronic sensor that sends data directly to a computer. The sensor replaces traditional film, and the image appears on a screen within seconds.
Specialists use digital x-rays to see what the eye cannot: decay between teeth, the position of unerupted teeth, bone level around the roots, and signs of infection. In pediatric dentistry, these images help track how a child's teeth and jaws are developing over time.
The technology has largely replaced film in modern dental offices. Software lets providers zoom, adjust contrast, measure structures, and store images in the patient's chart for later comparison.
How Digital X-Rays Work
Digital x-rays work by sending a brief beam of x-ray energy through the tooth and jaw onto a sensor that converts the energy into a digital image. The whole exposure takes a fraction of a second.
The sensor uses one of two technologies. Direct sensors (CCD or CMOS chips) connect to the computer by a cable and produce an image almost instantly. Indirect sensors (photostimulable phosphor plates) look like film, are exposed in the mouth, then scanned to create the digital image. Both reduce radiation compared with traditional film, since the sensors are more sensitive to lower doses.
Newer 3D systems, including cone-beam computed tomography (CBCT) and photon-counting detectors, capture volumetric data that can be reconstructed into cross-sectional views. A 2024 study in the Journal of Dentistry showed that clinical photon-counting CT can produce diagnostic dental images at roughly a quarter of the dose used by standard dental volumetric tomography.[2]
Common Formats Used in Specialty Care
Specialists choose the format that answers the clinical question with the least radiation.
- Bitewing: Shows the crowns of upper and lower back teeth together. Used to find cavities between teeth.
- Periapical: Shows the entire tooth from crown to root tip. Used for endodontic and trauma evaluation.
- Panoramic: A single curved image of both jaws. Useful for tracking developing teeth and screening for impactions.
- Cephalometric: A side-view skull image used in orthodontic planning.
- Cone-beam CT (CBCT): 3D imaging used selectively for complex anatomy, impactions, or implant sites.[1][5]
How Specialists Use Digital X-Rays
Specialists use digital x-rays to confirm a diagnosis, plan treatment, and monitor results. The images guide decisions that cannot be made from a visual exam alone.
Pediatric Dentistry
Pediatric dentists use digital x-rays to find early decay, check root development of permanent teeth, identify extra or missing teeth, and plan space maintenance after early tooth loss. Imaging is ordered based on a child's risk for decay and clinical findings, not on a fixed schedule.
Professional guidelines from the American Academy of Pediatric Dentistry emphasize using the lowest dose and fewest images that still answer the clinical question.[6] Lead aprons, thyroid collars, and child-sized sensors are standard. You can learn more about specialty care for children on the pediatric-dentistry page.
Endodontics
Endodontists use periapical x-rays and CBCT to map root canal systems, locate hidden canals, identify resorption, and confirm the source of infection. A narrative review of root canal anatomy notes that imaging is central to managing the wide variation in canal shape and number among patients.[3]
Oral Surgery and Implants
Oral and maxillofacial surgeons use panoramic and CBCT imaging to plan extractions, place implants, and evaluate jaw pathology. Mapping the inferior alveolar nerve before lower third-molar surgery or implant placement is one common indication; a systematic review and meta-analysis showed wide anatomical variation in the mandibular canal that imaging helps reveal.[5]
In implant dentistry, intraoperative CT scanning has become part of fully digital workflows that align planning, guided surgery, and prosthetic design.[1]
Orthodontics
Orthodontists use panoramic and cephalometric images to evaluate tooth position, jaw growth, and treatment progress. CBCT is reserved for complex cases such as impacted canines or skeletal asymmetries when 2D images cannot answer the clinical question.
Evidence and Regulatory Status
Digital dental x-ray sensors and CBCT systems are FDA cleared as medical devices through the 510(k) pathway, meaning the FDA has determined they are substantially equivalent to legally marketed predicate devices. FDA clearance is not the same as FDA approval (PMA), which applies to a separate, more rigorous review pathway used mainly for higher-risk devices.
Research on dental imaging continues to focus on reducing radiation while preserving diagnostic quality. A 2024 study in the Journal of Dentistry showed that clinical photon-counting CT can produce dental images at roughly a quarter of the dose used by dental volumetric tomography.[2]
Professional groups including the American Academy of Pediatric Dentistry and the American Dental Association recommend that imaging decisions be individualized based on each patient's history, risk, and clinical findings rather than performed on a routine schedule.[6][7] Digital imaging also supports specialized fields such as forensic odontology, where digital records improve identification accuracy compared with film-based methods.[4]
Benefits and Limitations
Digital x-rays offer real benefits over film, but they do not eliminate every limitation of dental imaging. A balanced view helps you weigh recommendations from your specialist.
Benefits
Digital systems generally use less radiation than film and produce images instantly, which shortens visits and supports the ALARA principle.[2][6]
- Lower radiation dose per image compared with traditional film.
- Immediate viewing on a chairside monitor.
- Software tools for zoom, contrast, and measurement.
- Easy storage, sharing, and comparison across visits.
- No chemical processing, which reduces environmental waste.
Limitations
Even with lower doses, every x-ray uses ionizing radiation, so imaging should be ordered only when it is likely to change diagnosis or treatment.[6]
- Sensors can feel bulky, especially for small children.
- 2D images compress 3D structures, which can hide overlapping anatomy.
- CBCT delivers more radiation than 2D digital x-rays and should be reserved for specific indications.[2][5]
- Image quality depends on technique, sensor placement, and software calibration.
- Initial equipment costs are higher than film, which can affect availability in some practices.
Cost and Insurance Coverage
Digital x-rays are generally billed per image or per series, with most dental plans covering routine imaging at recall visits. Costs vary by location, provider, and case complexity.
Typical patient out-of-pocket ranges in the United States, when not covered by insurance, are roughly $20 to $50 for a single periapical or bitewing image, $80 to $250 for a full-mouth or panoramic series, and $250 to $750 for CBCT scans. These figures are estimates based on common fee schedules and can be higher in some metro areas. Pediatric, endodontic, and surgical visits often bundle imaging into the procedure fee.
Most dental insurance covers a set number of bitewings and panoramic images per year. CBCT is typically covered when medically necessary, such as for implant planning or impacted teeth, but coverage varies by plan. Ask the office for an itemized estimate before treatment.
Questions to Ask Your Specialist
A short conversation before imaging helps you understand why an x-ray is recommended and how it will guide care. Specialists generally welcome these questions because they reflect informed, engaged patients.
- Why is this x-ray needed today, and how will it change my (or my child's) treatment plan?
- What type of image do you recommend, and is there a lower-dose option?
- How does your office reduce radiation exposure, especially for children?
- Will I receive a copy of the images for my records or for a second opinion?
- If CBCT is recommended, what specific question will it answer that 2D imaging cannot?
- How often will follow-up images be needed?
Find a Specialist Who Uses Digital Imaging
Most specialty dental practices in MSD's directory use digital x-ray imaging as part of routine care. To find a pediatric dentist or other specialist near you, browse the pediatric-dentistry page and review provider profiles for the equipment and services each office offers.
Search Pediatric Dentists in Your Area