Common Dental X-ray Artifacts and How to Troubleshoot Them

Raymond on February 12, 2026

Even the most experienced dental professionals encounter image artifacts that compromise diagnostic quality. Whether you are working with traditional film, digital sensors, or phosphor storage plates (PSP), understanding the causes of common X-ray artifacts — and knowing how to correct them — is critical for accurate diagnosis and efficient workflow. This guide covers the most frequently encountered dental X-ray artifacts, their root causes, and practical troubleshooting steps.

What Are X-ray Artifacts?

An artifact is any feature that appears on a radiographic image that does not represent actual patient anatomy. Artifacts can mimic pathology, obscure important diagnostic information, or simply degrade image quality to the point where a retake is necessary. Every retake means additional radiation exposure for the patient and lost chair time for the practice, making artifact prevention a priority.

Patient Positioning Errors

Positioning errors are among the most common causes of artifacts in intraoral and panoramic X-ray imaging.

Cone Cutting

Cone cutting occurs when the X-ray beam is not properly aligned with the sensor or film, resulting in a clear unexposed area on the image. This is immediately recognizable as a sharp, curved border between the exposed and unexposed portions of the image.

Troubleshooting: Ensure the position-indicating device (PID) is properly aligned with the sensor holder. Using beam-alignment devices (such as XCP or Rinn holders) significantly reduces cone cutting. Take a moment to verify alignment before each exposure.

Elongation and Foreshortening

Elongation makes teeth appear longer than they actually are, while foreshortening makes them appear shorter. Both result from incorrect vertical angulation of the X-ray beam relative to the sensor and tooth.

Troubleshooting: Elongation occurs when the vertical angle is too shallow (insufficient angle). Foreshortening occurs when the angle is too steep. Using the paralleling technique with proper beam-alignment instruments helps maintain consistent and correct angulation.

Overlapping

Overlapping of interproximal surfaces makes it impossible to evaluate contact areas for caries — defeating the primary purpose of bitewing X-ray images.

Troubleshooting: Overlapping results from incorrect horizontal angulation. The central ray must be directed through the contact points perpendicular to the interproximal surfaces. Adjust the horizontal angle so the beam passes cleanly between the teeth of interest.

Panoramic X-ray Artifacts

Panoramic radiography introduces a unique set of positioning-related artifacts due to the rotational nature of image acquisition.

Ghost Images

Ghost images are blurred, magnified duplicates of radiopaque objects (such as earrings, necklaces, or cervical spine vertebrae) that appear on the opposite side of the image from their actual location. They are created when a dense object is located between the X-ray source and the center of rotation.

Troubleshooting: Remove all metallic jewelry, eyeglasses, hearing aids, and removable dental prostheses before exposure. Ensure the patient’s cervical spine is straightened (chin slightly tucked) to minimize vertebral ghost images.

Patient Positioned Too Far Forward or Back

When the patient’s anterior teeth are positioned too far forward relative to the focal trough, they appear narrowed and blurred. If positioned too far back, the anterior teeth appear widened and magnified.

Troubleshooting: Use the bite guide and light positioning indicators on the panoramic unit. Ensure the patient bites the notch on the bite block with their upper and lower incisors edge-to-edge. Follow the manufacturer’s positioning protocol carefully.

Digital Sensor Artifacts

Digital imaging systems introduce their own category of artifacts that are distinct from those seen with traditional film.

Dead Pixels and Lines

CCD and CMOS digital sensors can develop dead or stuck pixels that appear as consistent black or white spots on every image. Damaged sensors may also show lines or bands across the image.

Troubleshooting: Run the sensor’s built-in calibration tool if available. If dead pixels or lines persist, the sensor may need professional repair or replacement. Handle sensors carefully to prevent damage — never drop, bend, or crush them.

Cable and Connection Issues

Damaged USB cables or loose connections can produce intermittent artifacts including image noise, partial image capture, or complete image failure. These issues may be mistaken for sensor damage.

Troubleshooting: Inspect the cable for visible damage, especially near the sensor housing where strain is greatest. Try a different USB port. If using a USB hub, connect directly to the computer instead. Replace cables that show signs of wear.

Phosphor Plate (PSP) Artifacts

Phosphor storage plates present their own unique artifact challenges.

Residual Image (Double Exposure)

If a PSP plate is not fully erased before reuse, a faint ghost of the previous exposure can appear superimposed on the new image. This is one of the most common PSP artifacts.

Troubleshooting: Always erase PSP plates on a light box or in the scanner’s erase cycle before each use. If plates have been stored for an extended period, erase them before first use to clear any accumulated background radiation exposure.

Scratches and Surface Damage

PSP plates are delicate. Scratches on the phosphor surface appear as fine white lines on the processed image. These artifacts are permanent and worsen over time.

Troubleshooting: Handle plates by the edges only. Use protective barrier envelopes during intraoral placement. Inspect plates regularly and retire any that show visible surface damage. PSP plates have a finite lifespan — most manufacturers recommend replacement after a set number of scan cycles.

Exposure Setting Errors

Incorrect exposure parameters produce images that are too dark (overexposed) or too light (underexposed). While digital systems offer some latitude for post-processing adjustment, severely over- or underexposed images cannot be salvaged.

Troubleshooting: Follow manufacturer-recommended exposure charts based on patient size and anatomy. Adjust kVp and mA settings appropriately for pediatric versus adult patients and for anterior versus posterior regions. Maintain a reference chart at each X-ray unit and train all operators on proper technique selection.

Building a Quality Assurance Program

The best approach to artifacts is prevention. Implement a quality assurance (QA) program that includes regular equipment testing, staff training, and image quality audits. Periodically review rejected images to identify patterns — if the same type of artifact recurs, it points to a systematic issue with technique, equipment, or training that can be addressed proactively.

By understanding the causes behind common dental X-ray artifacts, your team can minimize retakes, reduce unnecessary radiation exposure, and ensure that every image captured provides maximum diagnostic value.

CBCT vs. Traditional Dental X-ray: When to Use Which Technology

Raymond on February 12, 2026

Dental imaging technology has evolved dramatically over the past two decades. While traditional two-dimensional X-ray remains the backbone of dental diagnostics, cone beam computed tomography (CBCT) has emerged as a powerful three-dimensional imaging modality that is transforming treatment planning across multiple specialties. Understanding when each technology is appropriate is essential for delivering optimal patient care while managing radiation exposure and costs.

What Is Traditional Dental X-ray?

Traditional dental X-ray encompasses several well-established imaging techniques that produce two-dimensional images. The most common types include periapical radiographs, bitewing radiographs, and panoramic radiographs (orthopantomograms). These modalities have been the standard of care for decades and remain indispensable for routine diagnostic tasks.

Periapical X-ray images capture the entire tooth from crown to root apex, making them ideal for evaluating individual teeth, detecting periapical pathology, and assessing root morphology. Bitewing radiographs excel at revealing interproximal caries and monitoring alveolar bone levels. Panoramic radiographs provide a broad overview of the entire dentition, jaws, temporomandibular joints, and surrounding structures in a single image.

What Is CBCT?

Cone beam computed tomography uses a cone-shaped X-ray beam that rotates around the patient’s head, capturing hundreds of projection images in a single scan. Sophisticated software reconstructs these projections into a three-dimensional volumetric dataset that clinicians can navigate in axial, sagittal, and coronal planes — plus generate cross-sectional slices at any angle.

CBCT scanners designed for dental use typically feature smaller field-of-view (FOV) options, faster scan times, and lower radiation doses compared to medical CT scanners. However, the radiation dose from even a small-FOV CBCT scan is significantly higher than that of a standard periapical or panoramic X-ray.

When Traditional X-ray Is the Right Choice

For the vast majority of routine dental examinations, traditional X-ray remains the appropriate first-line imaging modality. The following scenarios are well-served by conventional radiography:

  • Caries detection: Bitewing radiographs remain the gold standard for detecting interproximal caries. Their high spatial resolution and low radiation dose make them ideal for periodic screening.
  • Periodontal assessment: Bitewings and periapical X-ray images effectively demonstrate alveolar bone levels and can track periodontal disease progression over time.
  • Routine endodontic evaluation: Periapical radiographs provide excellent detail for initial endodontic diagnosis, working length determination, and post-treatment follow-up in straightforward cases.
  • General screening: Panoramic X-ray offers an efficient overview for new patient evaluations, orthodontic assessment, and third molar evaluation.
  • Post-operative checks: Following routine restorative or surgical procedures, traditional X-ray is typically sufficient for monitoring healing.

Traditional X-ray benefits from lower cost per image, widespread availability, faster acquisition, and — most importantly — substantially lower radiation doses. The ALARA principle (As Low As Reasonably Achievable) demands that clinicians choose the lowest-dose imaging modality that can answer the clinical question.

When CBCT Is the Better Option

CBCT should be considered when two-dimensional imaging cannot provide the diagnostic information needed for safe and effective treatment. Key indications include:

  • Implant planning: CBCT provides precise measurements of bone height, width, and density at the proposed implant site. It also reveals the exact location of critical anatomical structures like the inferior alveolar nerve canal, mental foramen, and maxillary sinus floor.
  • Complex endodontics: Cases involving unusual root canal anatomy, suspected vertical root fractures, or resorptive lesions benefit enormously from three-dimensional visualization. CBCT can reveal additional canals that are invisible on periapical X-ray.
  • Impacted teeth: When panoramic X-ray suggests a close relationship between an impacted third molar and the inferior alveolar nerve, CBCT clarifies the precise spatial relationship and guides surgical planning.
  • Pathology evaluation: Large or complex jaw lesions, cysts, and tumors are better characterized with CBCT, which reveals their true three-dimensional extent and relationship to adjacent structures.
  • Orthodontic and orthognathic surgery planning: Complex cases benefit from three-dimensional cephalometric analysis and airway assessment that only CBCT can provide.
  • TMJ evaluation: CBCT offers superior visualization of bony components of the temporomandibular joint compared to panoramic X-ray.
  • Trauma assessment: Suspected jaw fractures, root fractures, and dentoalveolar trauma may require CBCT when conventional images are inconclusive.

Radiation Dose Considerations

Radiation dose is perhaps the most important factor in choosing between these technologies. A single periapical X-ray delivers approximately 1–8 microsieverts (µSv), while a full-mouth series delivers about 35–170 µSv. A panoramic X-ray typically delivers 10–25 µSv.

By comparison, a small-FOV CBCT scan delivers approximately 20–100 µSv, while a large-FOV CBCT scan can deliver 70–600 µSv or more, depending on the unit and exposure settings. This means a single large-FOV CBCT can deliver radiation equivalent to several full-mouth X-ray series.

Every CBCT scan should be clinically justified — there must be a specific diagnostic question that cannot be answered by lower-dose imaging. Routine use of CBCT for screening purposes is not supported by current evidence-based guidelines from organizations such as the American Dental Association, the American Academy of Oral and Maxillofacial Radiology, or the European Commission.

Cost and Workflow Implications

Beyond radiation, practices must consider the financial and workflow implications. CBCT units represent a significant capital investment, typically ranging from $70,000 to over $200,000. Ongoing costs include software licenses, maintenance contracts, and staff training. Traditional X-ray equipment is considerably less expensive to acquire and maintain.

CBCT scans also require more time for interpretation. A single CBCT volume may contain hundreds of slices, and the clinician is responsible for reviewing the entire volume — including areas outside the region of interest. Incidental findings in CBCT scans are common and must be documented and managed appropriately.

Making the Right Decision

The decision between CBCT and traditional X-ray should always be guided by the clinical question at hand. Start with the lowest-dose imaging modality that can provide the necessary diagnostic information. If two-dimensional imaging leaves unanswered questions that are critical to treatment planning, then CBCT is justified.

Document your clinical rationale for ordering any imaging study, especially CBCT. Ensure that staff operating CBCT equipment are properly trained, that the unit is regularly calibrated and maintained, and that appropriate quality assurance protocols are in place. With thoughtful application of both technologies, dental practices can deliver the highest standard of diagnostic care while respecting the principles of radiation safety.