In summary
Quick answer
3D CBCT is a cone beam tomography that creates three-dimensional images of dental and maxillofacial structures. When indicated, it allows the assessment of bone volume, relationship with nerves and maxillary sinuses, impacted teeth and certain injuries, increasing the accuracy of diagnosis and planning. The protocol is adapted to the clinical question and uses the lowest appropriate exposure.
What does a CBCT show that a 2D x-ray might not show?
A two-dimensional image superimposes structures. CBCT allows you to observe cuts in different planes and measure spatial relationships. In implantology, this can be useful for estimating bone volume and identifying relevant anatomical structures.
The diagnostic value results from the combination of detail, correct indication, adequate field of vision and professional interpretation of the entire volume.
When can a 3D CBCT be indicated?
The indication depends on the clinical question. It can be considered in implant planning, evaluation of impacted teeth, complex endodontics, trauma or pathology, when conventional imaging does not provide sufficient information.
- Define anatomical relationships before surgery.
- Investigate a situation that remains inconclusive in 2D.
- Plan complex or guided procedures.
- Assess the extent of certain bone or dental changes.
How is a 3D CBCT exam performed and interpreted?
During the acquisition, the person remains sitting or standing and the equipment rotates around the head for a few seconds. The team selects the field of view and parameters appropriate to the clinical question. Removing removable metal objects and remaining still helps reduce artifacts.
The result is a volume made up of many cuts, observed in a systematic way. In implant planning, measurements are related to the future position of the tooth and the entire acquired field is analyzed to recognize relevant clinical information.
What factors influence the quality of a 3D CBCT?
The CBCT represents the mineralized structures in great detail. When the issue involves soft tissues, other tests may be associated; metallic artifacts and movement are considered in acquisition and interpretation to preserve diagnostic quality.
Dimensions and resolution vary between equipment and protocols. Therefore, it should not be assumed that an old test, a very wide field, or the highest dose will always provide the most useful answer. Justification, optimization and interpretation are inseparable parts of diagnosis.
CBCT and intraoral scanner show the same thing?
No. The intraoral scanner records visible surfaces of the teeth and gums and can create a digital model of the bite. CBCT uses X-rays to represent internal mineralized structures. One shows mainly the surface; the other adds volumetric information about bone, roots and anatomical relationships.
In certain implant plans, the two sets of data can be overlaid to relate the intended position of the crown to the available bone. This integration requires quality files, compatible references and verification. A surgical guide produced from this data remains an instrument of the plan, not a stand-alone system.
- Intraoral scanner: external shape, contacts, space and prosthetic models.
- CBCT: bone, roots, impacted teeth and selected anatomical structures.
- Photography and video: smile, face, color and tissue movement.
- Clinical examination: health, sensitivity, mobility, palpation and individual context.
What exposure is associated with a 3D CBCT?
Yes. The dose varies with equipment, field of view and parameters. The examination must be justified and optimized: use the smallest field and sufficient quality to answer the clinical question.
Pregnancy or possibility of pregnancy, recent exams and previous documentation must be communicated. Avoiding unnecessary repetitions is part of responsible practice.
Frequently asked questions
Answers to common questions
Is CBCT necessary before all implants?
The decision is individual. In many implant plans it provides important information, but there must be a clinical justification and consideration of exams already available.
Does CBCT hurt or is it invasive?
No. It is a quick imaging test without surgical contact. It is necessary to remain still during the acquisition.
Who interprets the CBCT?
It must be interpreted by professionals with appropriate training, considering the entire volume acquired and the clinical context.
Can I take a CBCT performed at another clinic?
Yes. Bring the original file and the report, if any. The team will decide whether the quality, the field and the current situation respond to the clinical question, avoiding unnecessary repetition.
Does a CBCT replace the examination inside the mouth?
No. The image does not alone assess mobility, gums, hygiene, sensitivity, bite or expectations; it must be integrated with examination and clinical history.
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