What Are CBCT Scans and How Do They Work?
CBCT scans use a cone-shaped X-ray beam and a flat-panel detector to capture volumetric datasets of the craniofacial region. These scans produce isotropic voxels (0.075–0.4 mm), allowing precise 3D reconstructions for:
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Pre-operative planning
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Anatomical assessment
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Implant placement
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Surgical risk evaluation
Key advantages of CBCT scans include:
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Accurate 3D visualisation of teeth, bone, and nerves
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Adjustable field of view (FOV) for targeted imaging
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Lower radiation dose than conventional CT
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Fast scan acquisition reducing motion artefacts
CBCT Scans for Wisdom Tooth Extraction
CBCT scans are vital for assessing impacted third molars. They help surgeons to:
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Map the inferior alveolar nerve (IAN)
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Evaluate root morphology and curvature
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Measure lingual plate thickness
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Detect cysts, resorption, or other pathology
Using CBCT scans reduces the risk of nerve injury and allows safer surgical planning.
CBCT Scans in Dental Implant Planning
Dental implants require precise bone assessment, and CBCT scans provide:
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Measurements of bone height, width, and density
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Assessment of maxillary sinus anatomy and septa
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Visualisation of vital structures, including the IAN and mental foramen
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Data for surgical guides and dynamic navigation
CBCT scans improve implant accuracy, reduce complications, and enhance long-term outcomes.
CBCT Scans in Orthognathic Surgery
CBCT scans are essential for complex jaw surgery:
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3D cephalometric analysis
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Evaluation of skeletal asymmetry in three planes
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Virtual surgical planning and occlusal splint design
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Airway volumetric assessment for obstructive sleep apnoea (OSA)
When combined with intraoral scans, CBCT scans allow high-precision model surgery and better post-operative results.
CBCT Scans in Maxillofacial Trauma and Pathology
CBCT scans are highly effective in trauma and pathology management:
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Detection of mandibular and midfacial fractures
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Analysis of fragment displacement for surgical repair
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Identification of periapical lesions, resorption, and vertical root fractures
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Planning for apical microsurgery
Their high spatial resolution ensures accurate treatment planning in both office-based and hospital settings.
CBCT Scans for Sinus and Airway Evaluation
CBCT scans facilitate sinus and airway assessment in oral surgery:
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Detect sinus septa and Schneiderian membrane thickness for sinus lifts
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Evaluate airway volume for obstructive sleep apnoea (OSA)
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Identify mucosal pathologies such as polyps or mucoceles
Although CBCT scans excel at bone visualisation, soft tissue detail is limited, so careful interpretation is required.
Limitations of CBCT Scans
Despite their advantages, CBCT scans have some limitations:
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Reduced soft-tissue contrast compared with medical CT
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Susceptibility to metal artefacts
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Grey value variability between machines limits absolute density measurement
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Radiation dose must follow ALARA/ALADAIP principles
Conclusion: Why CBCT Scans Are Essential in UK Oral Surgery
CBCT scans have become a cornerstone of modern oral and maxillofacial surgery in the UK. They enhance diagnostic accuracy, surgical precision, and patient safety across procedures from dental implants and wisdom tooth extractions to orthognathic surgery and endodontic microsurgery. With evolving technology, CBCT scans will continue to improve clinical outcomes and streamline workflows for dental professionals.
