What causes floating teeth in the jaws on dental radiography?
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Answer:
Floating teeth refers to the radiographic appearance of teeth lacking visible supporting alveolar bone, classically due to loss of alveolar bone from Langerhans cell histiocytosis or severe periodontitis, with other causes including hyperparathyroidism, metastases, multiple myeloma, ameloblastoma, osteomyelitis, lymphoma, alveolar squamous cell carcinoma, and primary bone tumors such as Ewing sarcoma.
Why is it called so?:
The sign is named for the visual appearance of teeth seeming to float in air or swing without bony anchorage due to extensive destruction of the surrounding alveolar bone on imaging.
Pathophysiology:
Aggressive destruction of the alveolar process and supporting bone around tooth roots by underlying pathology leads to absence of visible osseous support, creating the illusion of isolated, unsupported teeth on panoramic or periapical radiographs.
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