Extraoral and CBCT dental exposures in Portugal
Dental radiography is the most frequently conducted X-ray examination and accounts for, atleast, one-third of all radiological examinationsin most countries(1). Although not as frequent asintraoral radiography, but with greater radiationdose, panoramic radiography is used to view teethand jaw bones in a single image, using a narrow beamrotating around the patient’s head. Some units areequipped with fixed-arm detectors for cephalometricradiography, lateral and posteroanterior/anteroposterior (PA/AP) images of the skull at fixed distance, fororthodontic analysis. Starting in the early 2000s, conebeam computed tomography (CBCT) equipment,allowed for digital volumetric tomography in dentalpractices, using a cone or pyramid-shaped X-raybeam and a flat-panel detector, to create 3D imagingof structures of the dentomaxillofacial region.Effective dose from dental CBCT can exceed from5 to 40 times the dose from dental panoramicradiography(2).
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