Pseudocysts in Dental Implants PDF

By O6U Staff Members What is meant by pseudo-cyst? 1. Pathologic Space 2. NOT Lined by Epithelium 3. Filled with Fluid or Semi-Solid Material Intra-bony Soft-tissue pseudo cyst ╳ true cyst Type True cyst...

By O6U Staff Members What is meant by pseudo-cyst? 1. Pathologic Space 2. NOT Lined by Epithelium 3. Filled with Fluid or Semi-Solid Material Intra-bony Soft-tissue pseudo cyst ╳ true cyst Type True cyst Pseudo cyst The wall of a true cyst consists of a The wall of a pseudocyst consists of Lining clearly defined epithelial cell layer granulation and/or fibrous tissue (origin: odontogenic X non odontogenic) (which is present secondary to inflammation) Classification of Pseudo cysts Traumatic Developmental bone marrow Aneurysmal Traumatic Static bone cyst defect Etiology and pathogenesis: Trauma-hemorrhage theory: Result from injury and haemorrhage within the bone. Failure of organization of the blood clot and repair. Hemorrhagic Bone Cyst?? It may occur as a sequence of enucleation of true cyst Clinically  Age : 10-20 Years  Location: Essentially restricted to the mandible Mainly in premolar– molar region Sex : most commonly in ♂  Manifestations: Asymptomatic and usually discovered accidentally Associated with vital teeth At operation the lesion appear as an empty cavity 5 Radiographic features Welldefined, radiolucent area without sclerotic ri m with projections that scalloped upward between the roots NO root resorption of related teeth Histopathological features:  Empty spaces of varying size with rough bony wall, some times with little fl uid  Surrounded by  Thin band of vascular fibrous connective tissue  Wall occasionally may contain multinucleated giant cells  Etiology and pathogenesis: 1. Most likely to be reactive lesion to vascular malformation “arteriovenous shunt” rather than cystic process. 2. Frequently develops secondary within another lesion of bone as a result of disrupted hemodynamics in pre-existing intrabony lesion ex. Central giant cell tumors 8 Clinical features Age : 10-20 Years Location: Shaft of long bones Vertebral column 2% Jaw bone; posterior mandibular area is more common Sex : female predilection Manifestations: Rapidly growing expansile swelling Painful frequently with parathesia  Radiographically: Multilocular radiolucencies with cortical thinning and jaw expansion “soap bubble” 1 0 Microscopically: Blood Soaked Sponge !!! Spaces of varying size clinical significance ??? Filled with unclotted blood Surrounded by cellular fibroblastic tissue Wall contain multinucleated giant cells “giant cell lesion” and osteoid tissue and woven bone at periphery Definition: Lingual mandibular Salivary Gland Depression: A developmental focal concavity of the lingual cortex of the mandible, usually in the third molar area “angle of the mandibule”, usually below the inferior alveolar canal. Etiology and pathogenesis: Entrapment of submandibular salivary gland tissue during the development of the mandible Clinically:  Age : Adults  Sex: 80-90% ♂  Clinical features: Posterior defects are related to submandibul ar SG Might interrupt the continuity of the inferior bo rder of the mandible Typically remain stable in size Radiographically:  Well defined corticated unilocular RL area  Unilateral  No needed biopsy  CT and Sialogram