A conventional dental X-ray is similar to a picture of a house from the front of the building. It displays what can be seen from that angle, but it also renders all elements in a 2D plane: the walls, the rooms and the pipes behind them are all visible in one image. That’s sufficient for many routine checks. In more complex situations, like with dental implants, the dentist has to inspect the entire structure from various viewpoints, or when a tooth won’t erupt, the dentist should know what is going on in the building.
This is what a 3D CBCT scan can deliver. Cone Beam Computed Tomography has revolutionized the modern dentist’s diagnosis and treatment planning, replacing ‘chance’ with ‘precision’. We will outline here what a CBCT scan is, how it works, what conditions it can be used to diagnose and the safety of the procedure as well as what to expect during the scan.
What Is a 3D CBCT Scan?
CBCT is an acronym for Cone Beam Computed Tomography. A special type of imaging that is used to look at teeth, jaws and the face. A machine spins around your head, usually between 10 and 40 seconds, during a scan. It spins and produces an X-ray beam that forms a cone, taking numerous X-rays from various angles. The software then “rebuilds” these images into an accurate three-dimensional model of your teeth, jawbones, nerves, sinuses and surrounding tissues.
The dentist can scroll through this model in slices, rotate the model, zoom into it and measure it, and see the same area from front, side and top view. Overlapping structures are represented separately on a flat X-ray so that nothing is concealed behind anything else.
There are CBCT vs Conventional Dental X-rays.
Dentists employ a number of kinds of imaging, all of which have their uses:
- Bitewing and periapical X-rays are small, fast, low dose images that are great for cavities between teeth, bone level and to view the roots of individual teeth.
- Panoramic X-rays (OPG) give a broad view of the upper and lower jaws, but do not provide great detail or depth.
- Volume is displayed in 3D CBCT scans. They show the exact location, depth and width of a bone, the route of nerves, the shape of the root canals and any hidden issues that an X-ray can not.
CBCT is not meant to be a substitute for regular x-rays. It is introduced when the clinical question requires the information to be three dimensional.
CBCT Scans For The Diagnosis of Dental Issues
1. Early detection of infections and bone loss. When the area at the tip of a tooth root becomes infected, it may be difficult to see on a regular X-ray or may not be seen at all if it lies behind another structure. A CBCT scan may be useful to assess the size and location of these lesions and also identify bone loss around the teeth due to gum disease to determine if the tooth can be saved.
2. Finding additional canals and root issues. There are more canals in many teeth, particularly upper molars, than expected, and some are narrow and curved. One of the most frequent causes for a failed root canal is a missed canal. A 3D view allows the dentist to identify all the canals, evaluate their curves and identify any cracks, fractures or root resorption that may not be detected otherwise.
3. Evaluation of impacted and unerupted teeth. The wisdom teeth, canines and extra teeth (supernumerary) can sometimes become trapped in the jaw. CBCT reveals the exact location of the tooth, the direction it is pointing, how close it is to neighboring roots, nerves/sinuses, and whether or not it is harming neighboring teeth. This will enable a safer surgical procedure or help the orthodontist determine the way in which the tooth could be positioned.
4. Identification of cysts, tumors and other abnormalities of the jaw. CBCT shows the bone in 3-D, which makes it useful for finding cysts and abnormal growths in the jaw, to better determine their size and to help plan future assessment. While dental imaging alone cannot effectively diagnose cancer, it can provide early clues of concern to prompt early investigation.
5. Evaluating the jaw joint (TMJ). CBCT can also provide information regarding the shape and position of the joint, signs of wear or degeneration, and the relationship of the bones, supporting diagnosis of the temporomandibular disorders for patients with jaw pain, clicking or locking and limited opening.
6. Studying the airway and sinuses. CBCT also provides information about the maxillary sinuses and portions of the upper airway, which helps the dentist determine how close the upper teeth’s roots are to the sinus, identify sinus problems with dental origin, and in some instances, alert the dentist to a narrowing of the upper airway that may be associated with breathing disorders or sleep apnea and referred to the proper specialist.
7. Assessing trauma and fractures. CBCT is useful in guiding urgent decisions following injury when there are root fractures or jaw fractures/displaced teeth that may be less clearly seen on flat images.
How CBCT Scans Help Plan and Deliver Treatment
Diagnosis is just 50% of the answer. CBCT also transforms the treatment from estimation to a measured treatment.
Dental implants. CBCT is most useful here. There should be sufficient bone quality and quantity at the proper angle and site free from critical structures for a successful implant. The scan provides information for the dentist to measure bone height, width and density, identify the inferior alveolar nerve in the bottom jaw, identify the sinus floor in the top jaw, and determine the optimum implant size, placement and angle.
The data can be used to plan the surgery virtually and a specific surgical guide can be prepared in advance for precise positioning of the implant. This makes it easier to predict and will help prevent complications. Patients requiring bone grafting or sinus enhancement also can be identified in advance. To know more on implants visit our dental implants page for Chandigarh.
Root canal treatment and endodontics. A 3D view will be provided with complex and repeat root canal cases to see the shape of the canals, position of infection and any hidden anatomy that will allow targeted and complete treatment. It can be used for modern treatments such as laser root canal treatment in Chandigarh, where precision is key.
Orthodontics and Invisalign. CBCT allows our orthodontists in Chandigarh to determine the size and shape of the jaw, the position of impacted teeth, root location and the thickness of the bone around teeth, which helps to determine the movement of the teeth and how far and safely they can be moved. It is ideal for complicated situations where digital scans are used for planning braces and invisalign in Chandigarh.
Oral surgery and extraction of wisdom teeth. This will allow the surgeon to see how near the wisdom tooth is to the nerve and to mentally prepare for possible complications before the procedure and to warn the patient.
Treatment of gums and bones. For periodontal treatment, the scan provides a picture of the shape of the bone defects surrounding the teeth to determine if the treatment will be non-surgical or surgical.
Complete mouth reconstruction and smile design. In situations where the case contains several implants, crowns, bridges and cosmetic work, 3D imaging acts as the foundation for a coordinated plan, function is planned in conjunction with aesthetics and not simply guessed.
The advantages of 3D CBCT imaging are significant.
3D CBCT imaging offers many benefits.
- Accuracies: True-to-scale, three-dimensional measurements without the distortion and overlap of 2D images.
- Early detection: small lesions, fractures and hidden canals are discovered earlier.
- Safer procedures: Nerves, sinuses and adjacent roots are mapped prior to treatment.
- No last minute discoveries: The plan is developed on true anatomy, not assumptions.
- Fast and convenient: The scan only takes several seconds and the patient just has to stand or sit down.
- Improved communication – patients can view their anatomy on screen, making it easier to understand the issue and the suggested treatment.
- Lower dose than medical CT: Dental CBCT typically delivers a significantly less radiation dose than a standard medical, hospital CT scan of the head, depending on the machine and settings.
Are CBCT Scans safe?
All X-rays use radiation and the dentist strives to follow the ALARA principle, which stands for “as low as reasonably achievable”. A CBCT scan is ordered for only those patients who may benefit from the additional radiation exposure, but is not routinely ordered for all patients. The dose is dependent on the field of view, the settings and the machine. Smaller scan volumes, which only cover a single area, will require less radiation than a full-jaw scan and modern machines enable the dentist to adjust the settings to the individual case.
Where appropriate in the context of clinic protocols, protective items (such as lead aprons and thyroid collars) may be used. Always let the dentist know if the patient is pregnant before taking any X-ray of the mouth. Image is rarely performed unless necessary and elective scans are delayed. Children have a scan only as necessary clinically, and in appropriate child-friendly environments.
Limitations the patient should be aware of.
CBCT is not everything and no better.
- It is excellent at showing hard tissues (bone, teeth) and not as good at showing soft tissue (muscles, disc in the jaw joint) detail as MRI.
- Metal fillings, crowns and implants can create streaking, called artefacts, that can affect areas close by.
- Staying still is important because the images will not be as good if you move during the scan.
- It is not required for all patients. Usually, a simple filling or a routine check-up is not sufficient to warrant a 3D scan.
- Must be performed by a trained dentist and should be interpreted by a trained dentist. Experience is what transforms data into a diagnosis, software merely displays the data.
Before your CBCT scan, here are a few things you should know.
1. Preparation. Metal items like earrings, glasses, hairpins and necklaces, and removable dentures or aligners that may interfere with the image will be required to be removed.
2. Positioning. Your head will be supported and lowered with your chin on a support, while you stand or sit.
3. The scan. The machine rotates around your head once. It’s important to remain relaxed and breathe normally. It takes just a few seconds to less than a minute to complete the scan.
4. Reconstruction. The software is able to create the 3D image displayed on the screen within a short time.
5. Review and explanation. The dentist reviews the images with you, shares the findings, and explains how they will impact your treatment.
No injections, no preparation or any other invasive or painful method.
Who is the 3D CBCT scan for?
If you have one, you may need it if you:
- Considering dental implants or a full mouth rehab treatment
- Are you having a complicated or second opinion dental root canal?
- Wisdom teeth that have impacted or unerupted tooth
- Unusual pain not explained by a regular X-ray
- The treatment is complex and about to start orthodontic or Invisalign treatment
- Have pain, clicking or locking of the jaw joints
- Suffered a dental/face injury
If a cyst or lesion is suspected in the jaw, it needs to be evaluated.
Combined with CBCT and Digital Dentistry: A Connected Approach
The benefits of CBCT are realized when it’s used in conjunction with other digital tools. A virtual plan can be created from a 3D scan of the bone, intraoral scan of teeth and gums, and digital technology for smile makeovers all in one plan. This enables dentists to plan where to place the implants according to the final shape of the crown, design guides and restorations using CAD-CAM technology and present the planned outcome to the patient before the treatment is started. The goal is treatment that is planned from the end backwards, and each step is based on measured data.
How The Smile Designers Uses 3D Imaging
At The Smile Designers, our clinics in Chandigarh and Mohali use digital scanners and 3D imaging to support accurate diagnosis and precise planning. Our team of specialists, including an orthodontist and an endodontist, relies on detailed imaging to plan implants, root canals, orthodontic care and smile makeovers, and explains the findings to patients in plain language during consultation. You will see your own scan, understand what it shows and know why each step of treatment is recommended, with costs discussed upfront.
Frequently Asked Questions
Does a CBCT scan hurt?
No. The scan is painless and quick. You only need to stand or sit still for a few seconds.
How long does a CBCT scan take?
The scan itself typically takes under a minute. The whole appointment, including positioning and review, is usually short.
Is CBCT better than a regular dental X-ray?
It is better for certain purposes, such as implant planning, complex root canals and impacted teeth, because it shows depth and volume. For routine cavity checks, standard X-rays are often more suitable and use less radiation.
How much radiation does a CBCT scan involve?
The dose depends on the machine and settings, and is generally lower than a medical CT scan of the head. Your dentist will choose the smallest scan area and settings needed for your case.
Do I need a CBCT scan for a dental implant?
For most implant cases, a 3D scan is strongly recommended, because it shows bone volume and the position of nerves and sinuses that cannot be judged on flat X-rays.
Can a CBCT scan detect cavities?
It can show some advanced decay, but it is not the first choice for detecting small cavities. Bitewing X-rays and clinical examination are better for that.
Can children have CBCT scans?
Only when clearly needed, such as for impacted teeth or injuries, and with settings adjusted for children.
Book Your Consultation
If you have been told you need an implant, a complex root canal or treatment for an impacted tooth, a precise 3D diagnosis can make all the difference. Call The Smile Designers in Chandigarh at +91 7579999927 or in Mohali at +91 9501773777, or book an appointment online.
This article is for general education and is not a substitute for a professional examination. Whether a CBCT scan is needed depends on your individual clinical situation.
