Master the critical kVp and mAs settings for dental X-ray equipment. Learn how proper calibration produces optimal image quality while minimizing patient radiation exposure.
Digital X-ray sensors are expensive and critical components. When they malfunction, practices face workflow disruption. Learn troubleshooting techniques and repair options to minimize downtime and make informed maintenance decisions.
Modern dental X-ray generators are equipped with sophisticated self-diagnostic systems that monitor electrical, mechanical, and thermal conditions during operation. When something falls outside normal parameters, the unit displays an error code — a shorthand message that tells you (or your service technician) what went wrong. Understanding these codes is the first step toward faster troubleshooting, less downtime, and fewer unnecessary service calls.
This guide covers the most common dental X-ray generator error codes, explains what they mean, and provides practical steps your team can take before calling for professional service.
Before interpreting error codes, it helps to understand the basic components of a dental X-ray generator:
While specific codes vary by manufacturer (Planmeca, Dentsply Sirona, Carestream, Vatech, and others all use their own numbering systems), most error codes fall into predictable categories:
Typical codes: E01, E10, “Tube Overheat,” “Thermal Protection Active”
What it means: The X-ray tube has exceeded its heat capacity. Every X-ray tube has a maximum heat unit (HU) rating, and the generator tracks heat accumulation over time. When the tube is too hot, the generator blocks further exposures to prevent permanent tube damage.
What to do:
Typical codes: E02, E20, “Exposure Interrupted,” “Timer Fault”
What it means: The exposure didn’t complete as programmed. The generator detected that the actual exposure time didn’t match the set time, or the exposure was interrupted by a safety interlock.
What to do:
Typical codes: E03, E30, “Comm Error,” “Link Fault,” “No Sensor Detected”
What it means: The generator cannot communicate with the sensor, computer, or another system component. This is increasingly common with networked digital imaging systems.
What to do:
Typical codes: E04, E40, “Power Fault,” “Voltage Out of Range,” “Line Voltage Error”
What it means: The incoming electrical power is outside the acceptable range for the generator. Dental X-ray units typically require 110–120V or 220–240V AC (depending on the model) within a tight tolerance, usually ±10%.
What to do:
Typical codes: E05, E50, “Cal Error,” “Self-Test Failed,” “kV Feedback Error”
What it means: During startup or before an exposure, the generator runs internal self-tests to verify that its output will match the programmed parameters. A calibration error means the unit detected a discrepancy between the expected and actual output.
What to do:
Typical codes: E06, E60, “Arm Position Error,” “Collision Detected,” “Movement Fault”
What it means: The unit detected an issue with the mechanical positioning system. This is more common in panoramic and CBCT units with motorized arms, but wall-mounted intraoral units with extension arms can also trigger position-related errors if the arm doesn’t lock properly.
What to do:
Each manufacturer provides documentation for their error codes. Here’s how to access support from major dental X-ray manufacturers:
Always keep your unit’s serial number, model number, and software version accessible when contacting support — this speeds up the diagnostic process considerably.
A good rule of thumb for dental office staff:
You can safely address:
Call a technician when:
Many error codes are preventable with basic maintenance and awareness:
X-ray generator error codes are your equipment’s way of communicating problems before they become catastrophic failures. By understanding the common error categories, knowing which issues you can resolve in-house, and maintaining a relationship with a qualified service provider, your dental practice can minimize imaging downtime and keep patient care on track. When in doubt, don’t force the unit to operate through an error — address the issue first, and your equipment will reward you with years of reliable service.
Dental X-ray equipment comes into direct or indirect contact with patients during every imaging procedure. Intraoral sensors enter the mouth, tube heads are positioned near the face, and control panels are touched by gloved hands. Without rigorous infection control protocols, X-ray equipment can become a vector for cross-contamination between patients — a risk that’s entirely preventable with proper procedures.
This guide covers evidence-based infection control practices for dental X-ray equipment, including barrier techniques, disinfection protocols, and workflow strategies that protect patients and staff without damaging sensitive equipment.
The CDC and OSAP (Organization for Safety, Asepsis and Prevention) classify dental X-ray equipment into categories based on their contact with patients:
Intraoral digital sensors are the most critical pieces of X-ray equipment from an infection control standpoint because they enter the patient’s mouth. Here’s how to handle them properly:
Every intraoral sensor must be covered with an FDA-cleared barrier sleeve before placement in a patient’s mouth. This is non-negotiable. Key points about barrier sleeves:
Even with barrier sleeves, sensors should be disinfected after each patient because barrier failures can occur without being visible. Follow this protocol:
Important: Never immerse digital sensors in liquid disinfectant or autoclave them unless the manufacturer explicitly states they are designed for these methods. Most digital sensors are not waterproof and will be permanently damaged by immersion or steam sterilization.
Sensor holders (such as Rinn XCP or similar positioning devices) enter the patient’s mouth and are classified as semi-critical items. Infection control requirements are straightforward:
The tube head and PID (position-indicating device or “cone”) are touched during positioning and can become contaminated by gloved hands that have contacted the patient’s mouth. Proper management includes:
Cover the tube head and PID with disposable plastic barriers before each patient. Barrier options include:
After the patient appointment, remove barriers with gloved hands and discard them. If barriers were compromised or not used, disinfect the tube head and PID surfaces with an EPA-registered intermediate-level disinfectant.
The exposure switch or button is typically located outside the operatory (or behind a shield) and is pressed by the operator. If the operator has changed gloves after positioning the sensor, the button may not be contaminated. However, best practice includes:
Even the best barriers and disinfectants are only effective when paired with a smart workflow. Here are strategies to build infection control into your radiographic routine:
If your practice uses phosphor storage plates instead of digital sensors, infection control differs slightly:
Infection control protocols are only as strong as the team’s commitment to following them. Ensure compliance by:
Infection control for dental X-ray equipment is straightforward when you follow established guidelines: barrier everything that can be barriered, disinfect what can’t be sterilized, sterilize what enters the mouth, and build these steps into a consistent workflow. By making infection control a seamless part of every radiographic procedure, your practice protects patients, protects staff, and demonstrates the standard of care that patients expect and deserve.
Intraoral X-ray imaging is the backbone of dental diagnostics, used daily in virtually every dental practice for detecting caries, evaluating periodontal bone levels, assessing root morphology, and planning treatments. Yet even experienced dental professionals occasionally struggle with positioning errors that compromise image quality. Poor positioning leads to retakes, which means more radiation exposure for patients, wasted time, and frustration for the clinical team.
This guide covers the most common intraoral X-ray positioning errors, explains why they occur, and provides practical techniques to eliminate them from your workflow.
Before diving into specific errors, it helps to understand the geometric principles that govern intraoral imaging:
What it looks like: Teeth appear stretched or taller than they actually are.
Cause: The vertical angle of the X-ray beam is too shallow (insufficient vertical angulation). In the bisecting angle technique, this means the beam was directed more perpendicular to the sensor than to the bisecting line.
Fix: Increase the vertical angulation of the tube head. If using the paralleling technique with a sensor holder, ensure the aiming ring is properly seated against the tube head — a gap between the ring and the PID (position-indicating device) is a common cause of angulation error.
What it looks like: Teeth appear shorter or compressed compared to their actual size.
Cause: The vertical angle is too steep (excessive vertical angulation). The beam is directed more toward the sensor surface rather than perpendicular to the bisecting line.
Fix: Decrease the vertical angulation. With the paralleling technique, verify that the sensor is truly parallel to the tooth — if the patient has bitten too hard on the holder and bent the sensor, the geometry is compromised.
What it looks like: The mesial and distal surfaces of adjacent teeth overlap on the image, obscuring the contact area — exactly the region you’re trying to evaluate for interproximal caries.
Cause: Incorrect horizontal angulation. The beam isn’t directed through the interproximal contact points at the proper angle.
Fix: Adjust the horizontal angle of the tube head so the beam passes directly through the contact areas. For premolars, this typically requires a slightly more anterior horizontal angle than for molars. Use the aiming ring on your sensor holder as a guide — align the PID with the ring, and the horizontal angle should be correct.
What it looks like: A portion of the image is unexposed (appears clear/white on digital), creating a half-moon or crescent-shaped blank area.
Cause: The X-ray beam was not centered on the sensor. The PID wasn’t properly aligned with the aiming ring, so part of the sensor fell outside the beam’s path.
Fix: Ensure the PID is flush against the aiming ring and centered on it. Don’t try to position the PID by sight alone — use the ring as your guide every time. For rectangular collimation, alignment is even more critical since the beam is more tightly focused.
What it looks like: The apices of the teeth are cut off (sensor too high for mandibular, too low for maxillary), or there’s excessive soft tissue visible beyond the crowns.
Cause: The sensor wasn’t placed deep enough in the patient’s mouth, or it was positioned too far beyond the teeth of interest.
Fix: For periapical images, position the sensor so that it extends at least 2–3 mm beyond the apices of the target teeth. The sensor’s long axis should be parallel to the long axis of the teeth. Ask the patient to bite down slowly and firmly on the sensor holder — don’t let them “hover” above it.
What it looks like: A blurred or double-contour image, often with a ghostly appearance.
Cause: The patient moved during the exposure. Even slight head movement during the fraction-of-a-second exposure can degrade sharpness.
Fix: Instruct the patient to remain completely still and to hold their breath during the exposure. Ensure the patient is seated comfortably with their head supported. For patients who have difficulty staying still (children, elderly, anxious patients), consider using the shortest possible exposure time that still produces adequate image density.
Bitewing X-rays present their own positioning challenges. Here are targeted tips for consistently good bitewings:
Not every patient has a textbook oral anatomy or the ability to cooperate easily. Here are strategies for challenging situations:
Rectangular collimation limits the X-ray beam to a rectangle that closely matches the sensor’s dimensions, reducing the patient’s radiation exposure by up to 60% compared to a round PID. While it demands more precise alignment (cone cuts are more likely with a rectangular beam), the radiation dose reduction makes it well worth the learning curve. Most modern sensor holders include rectangular collimation rings — use them consistently.
The key to eliminating positioning errors is standardization:
Mastering intraoral X-ray positioning is a skill that pays dividends every day in clinical practice. By understanding the geometric principles behind radiographic imaging, recognizing common errors, and applying consistent technique, your team can produce diagnostic-quality images on the first attempt — reducing retakes, minimizing patient radiation exposure, and supporting better clinical decision-making. Invest in training, use proper positioning tools, and make technique review a regular part of your practice culture.
Panoramic X-ray machines are essential diagnostic tools in modern dental practices, providing comprehensive views of the entire oral and maxillofacial region in a single image. However, like any precision instrument, these units require regular calibration and quality assurance (QA) to produce diagnostically accurate images. Without proper calibration, your panoramic unit may deliver distorted, underexposed, or overexposed images — leading to misdiagnosis, unnecessary retakes, and increased radiation exposure for patients.
In this guide, we’ll walk through the fundamentals of panoramic X-ray calibration, outline a practical QA schedule, and share troubleshooting tips to keep your unit performing at its best.
Calibration refers to the process of verifying and adjusting your panoramic unit’s settings so that it produces consistent, high-quality images. The key parameters involved include:
A robust QA program ensures your panoramic unit consistently meets diagnostic standards. Here’s a recommended schedule broken into daily, weekly, monthly, and annual tasks:
Even with a solid QA program, issues can arise. Here are some of the most common calibration-related problems and how to address them:
Ghost images occur when dense structures (such as the spine or the opposite side of the mandible) appear as faint duplicates on the image. While some ghosting is inherent to panoramic geometry, excessive ghosting may indicate misalignment of the rotation center or an incorrect focal trough setting. Recalibrate the rotation center per the manufacturer’s service manual, or contact your service technician.
If one side of the panoramic image is consistently darker or lighter than the other, the X-ray tube or detector may be misaligned. This can also result from an aging X-ray tube with uneven output. Run a flat-field calibration if your system supports it, or have the tube alignment checked professionally.
Blurriness that persists regardless of patient positioning often points to mechanical issues — worn bearings in the rotation arm, a loose detector, or vibration during the scan. Inspect all mechanical components and tighten any loose fittings. If the issue persists, contact your service provider.
Panoramic X-ray images inherently magnify structures, typically by 15–30%. However, if magnification changes unexpectedly, the distance between the X-ray source, rotation center, and detector may have shifted. This requires professional recalibration of the unit’s geometry.
Proper documentation is not just good practice — it’s often a regulatory requirement. Maintain a QA log that includes:
Store these records in a dedicated binder or digital folder and ensure they’re accessible during inspections. Many state radiation control programs require QA documentation to be retained for a minimum of three years.
Beyond your QA schedule, adopting these best practices will extend the life of your panoramic unit and maintain image quality:
While dental office staff can handle routine QA tasks, certain situations require a qualified service engineer:
Maintaining a service contract with an authorized provider ensures prompt response times and access to genuine replacement parts.
A well-calibrated panoramic X-ray unit is the foundation of reliable dental diagnostics. By implementing a structured quality assurance program, documenting your results, and addressing issues promptly, you can ensure consistent image quality, minimize patient radiation exposure, and avoid costly downtime. Make calibration and QA a non-negotiable part of your practice’s routine — your patients and your diagnostic confidence depend on it.
Digital X-ray sensors represent one of the most significant investments in a dental imaging workflow — with individual sensors costing anywhere from $5,000 to $15,000 or more. Despite their robust appearance, these precision instruments are surprisingly fragile. Proper care and maintenance can extend sensor lifespan by years, reduce costly repairs and replacements, and ensure consistently high image quality. This guide covers everything your team needs to know about keeping digital sensors in optimal condition.
Modern dental digital X-ray sensors come in two main varieties: CCD (charge-coupled device) and CMOS (complementary metal-oxide semiconductor). Both types contain delicate electronic components sealed within a rigid housing, connected to the workstation via a USB cable. The sensor face — the active imaging area — is covered by a thin protective layer, but this layer is not indestructible.
The most vulnerable points on any digital sensor are the cable junction (where the cable meets the sensor housing), the sensor face, and the cable itself. Understanding these vulnerabilities is the first step toward effective care.
Digital sensors cannot be heat-sterilized in an autoclave — the electronics would be destroyed. Instead, infection control relies on single-use barrier sleeves combined with surface disinfection between patients.
After barrier removal, wipe the sensor and cable with an intermediate-level disinfectant approved by the manufacturer. Avoid submerging the sensor in disinfectant solution — the liquid can penetrate seals and damage internal electronics. Common compatible disinfectants include CaviWipes, Birex SE, and similar EPA-registered hospital-grade products. Always check your sensor manufacturer’s recommendations, as some disinfectants can degrade certain housing materials over time.
How sensors are handled between patients is where most damage occurs. Implement these practices across your team:
This seems obvious, but drops are the leading cause of sensor failure. A single drop from counter height onto a hard floor can crack the internal scintillator crystal, resulting in permanent dead zones on every subsequent image. Use sensor holders with lanyards when possible, and never leave sensors dangling from countertops by their cables.
The USB cable is the sensor’s lifeline — and its weakest point. Cable damage accounts for a large percentage of sensor repairs. To protect the cable:
When not in use, store sensors in a dedicated padded holder or cradle. Many manufacturers provide custom storage solutions — use them. Do not toss sensors into drawers with other instruments where they can be bumped, scratched, or crushed. Designate a specific “home” location for each sensor in every operatory.
Digital sensors are thicker and more rigid than film, which can make them uncomfortable for patients — especially when imaging posterior areas. Uncomfortable patients are more likely to move, bite down hard, or push the sensor with their tongue, all of which increase the risk of damage.
Consider using foam cushion covers or comfort sleeves that fit over the barrier. These reduce the hard edges that patients find most objectionable and decrease the likelihood of bite damage to the sensor. Products like the “Sensor Guard” or similar foam accessories are inexpensive and can significantly improve patient tolerance.
Regular quality assurance testing ensures that your sensors continue to produce diagnostic-quality images. Implement the following routine:
Keep a log of all QA activities. If image quality degrades gradually, a documented baseline makes it much easier to identify when the problem began and whether it correlates with a specific event (such as a drop or cable replacement).
Not all sensor problems require replacement. Cable damage, connector issues, and minor calibration drift are often repairable at a fraction of the cost of a new sensor. Many third-party repair services now offer sensor repair with warranties, making this a cost-effective option for practices.
However, certain types of damage — particularly cracked scintillator crystals or moisture intrusion into the sealed housing — typically indicate that replacement is the more practical option. If your sensor shows persistent dead pixels, expanding dark zones, or image artifacts that do not resolve with recalibration, consult with a qualified repair technician for an honest assessment.
Sensor care is a team responsibility. Every clinical staff member who handles digital sensors should receive formal training on proper care protocols. Include sensor handling in your new employee orientation and conduct periodic refresher training. Post a quick-reference care guide in each operatory as a visual reminder.
Consider tracking sensor-related incidents (drops, barrier breaches, cable damage) to identify patterns. If one operatory has more incidents than others, investigate the workflow and physical setup to find root causes. A proactive approach to sensor care pays for itself many times over in avoided repair costs and extended equipment life.
Your digital X-ray sensors are precision instruments that deserve precision care. By implementing consistent handling, cleaning, storage, and quality assurance protocols, your practice can maximize the return on this critical investment while ensuring the highest standard of diagnostic imaging for every patient.
Radiation safety in the dental office is not optional — it is a legal requirement, an ethical obligation, and a cornerstone of professional practice. Whether your office operates a single intraoral X-ray unit or a full imaging suite with panoramic and CBCT capabilities, compliance with radiation safety regulations protects your patients, your staff, and your practice. This article outlines the essential elements of a dental radiation safety program and the compliance standards every office should meet.
In the United States, dental X-ray equipment and radiation safety are regulated at both the federal and state levels. The Food and Drug Administration (FDA) sets performance standards for X-ray equipment manufacturing, while individual state radiation control programs regulate the registration, inspection, and use of X-ray equipment in dental practices.
Requirements vary significantly from state to state. Some states require periodic inspections of dental X-ray equipment, while others rely on self-certification. Some mandate specific training hours for dental auxiliaries who operate X-ray equipment, while others defer to the supervising dentist. It is each practice’s responsibility to know and comply with the regulations in their jurisdiction.
The ALARA principle — As Low As Reasonably Achievable — is the guiding philosophy of radiation protection. It means that every reasonable effort should be made to minimize radiation exposure to patients and staff, even when doses are already below regulatory limits. ALARA is not just a suggestion; it is a regulatory expectation embedded in radiation protection standards worldwide.
Applying ALARA in dental practice involves three strategies: minimizing exposure time, maximizing distance from the radiation source, and using appropriate shielding.
Protecting patients from unnecessary radiation begins before the X-ray unit is turned on. The most important patient protection measure is clinical justification — every X-ray exposure must be based on an individual assessment of the patient’s clinical needs. Routine X-ray imaging based solely on time intervals (such as “bitewings every six months for all patients”) without clinical justification does not meet current standards of care.
The ADA and FDA jointly published selection criteria guidelines that recommend radiographic examinations based on the patient’s age, clinical signs, symptoms, and risk factors — not arbitrary schedules. Familiarize your team with these guidelines and apply them consistently.
The use of thyroid collars during intraoral X-ray exposures is strongly recommended, as the thyroid gland is radiosensitive and often lies within or near the primary beam path. Lead or lead-equivalent aprons provide additional protection for the patient’s torso, though their necessity is debated for properly collimated modern equipment. When in doubt, use both — the cost is negligible and the patient perception of safety matters.
Note that thyroid collars should not be used during panoramic X-ray exposures, as they interfere with the image by blocking the X-ray beam path.
Rectangular collimation reduces the X-ray beam to approximately the size of the sensor or film, dramatically reducing the volume of tissue irradiated compared to the standard round PID. Studies have shown that rectangular collimation can reduce patient dose by up to 60% compared to round collimation. If your practice is not using rectangular collimation for intraoral X-ray imaging, this is one of the single most impactful changes you can make.
Digital sensors and PSP plates require significantly less radiation than traditional D-speed film. If your practice still uses film, transitioning to digital imaging will reduce patient doses substantially while also improving workflow efficiency and image management.
Dental X-ray operators must protect themselves from scatter and secondary radiation. The primary rules are straightforward:
While not universally required in dental settings, personnel dosimetry badges are recommended when operators work near CBCT equipment or in high-volume imaging environments. Dosimetry provides documented evidence that occupational exposures remain within regulatory limits and helps identify any unexpected exposure patterns early.
Dental X-ray equipment must meet specific performance standards to be legally operated. Key requirements include:
Maintaining thorough records is a fundamental component of radiation safety compliance. Essential documentation includes:
Every team member who operates X-ray equipment or assists during exposures should receive formal radiation safety training. Training should cover the biological effects of radiation, principles of radiation protection, proper equipment operation, patient and operator protection techniques, and emergency procedures. Many states require documented training before dental auxiliaries are permitted to expose X-ray images.
Refresher training should be conducted annually or whenever new equipment or protocols are introduced. Make radiation safety a standing agenda item in staff meetings to reinforce good habits and address any issues promptly.
Compliance is more than checking boxes — it is about creating a practice culture where radiation safety is valued and practiced consistently. When every team member understands why these measures matter, compliance becomes second nature. Start with a written radiation safety manual, designate a radiation safety officer within the practice, and conduct regular audits to ensure that policies translate into daily practice. Your patients trust you with their health — radiation safety compliance is an essential part of honoring that trust.
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.
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.
Positioning errors are among the most common causes of artifacts in intraoral and panoramic X-ray imaging.
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 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 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 radiography introduces a unique set of positioning-related artifacts due to the rotational nature of image acquisition.
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.
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 imaging systems introduce their own category of artifacts that are distinct from those seen with traditional film.
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.
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 storage plates present their own unique artifact challenges.
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.
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.
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.
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.
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.
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.
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.
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:
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.
CBCT should be considered when two-dimensional imaging cannot provide the diagnostic information needed for safe and effective treatment. Key indications include:
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.
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.
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.
