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Published byColeen Fitzgerald Modified over 9 years ago
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Fibrous Dysplasia
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Fibro-Osseous Lesions of the Jaws 1. Fibrous dysplasia (hamartoma) 2. Cemento-osseous dysplasia (reactive) a. Focal cemento-osseous dysplasia b. Periapical cemento-osseous dysplasia c. Florid cemento-osseous dysplasia 3. Ossifying fibroma (neoplastic)
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a developmental tumorlike condition replacement of normal bone by an excessive proliferation of cellular fibrous connective tissue intermixed with irregular bony trabeculae Fibrous dysplasia a postzygotic mutation ……… during postnatal life……..affecting a single bone. maxillary involvement by fibrous dysplasia in a 7-year year-old boy.
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a mucoperiosteal flap reveals the dense, slightly nodular enlargement.
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There is slight buccal enlargement but little malalignment of teeth
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Radiographs show a poorly demarcated finely granular opacity.
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Occasionally, a mottled radiopaque pattern. there is much more fibrous connective tissue and less bone than is found in the typical ground glass pattern
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The margins of the lesion are not well defined and blend into the adjacent bone
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A cellular, active fibrous connective tissue containing irregular, partially calcified bone trabeculae.
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Higher power reveals that bone formation is by a " metaplastic" process from the fibrous stroma rather than by rows of osteoblasts forming lamellar bone
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This is a cellular fibrous stroma containing immature bone less cellular and active fibrous connective tissue with more mature appearing bone trabeculae irregular calcified masses resembling cementicles
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Osteoid pheriphery Lack of Osteoblastic rim
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Cementicle
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