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Oral Path Chap 19

Cyst? abnormal cavity in hard or soft tissue, which contains fluid or semi-soft fluid and is often encapsulated and lined with epithelium
Why does a cyst form? Body’s attempt to protect the area of tissue
Why during inflammation—caries leading to necrosis of the pulp? Epithelium grows and forms a distinct circle, and eventually closes itself from the surrounding tissue Cyst fills with fluid and expands
what does osteoclasts do? Absorb bone
Odontogenic cyst? cysts with an epithelial lining composed of remnants of the tooth-forming organ that arise primarily in tissue and bone
Non-odontogenic cyst? abnormal closed epithelium-lined cavity in the body, containing gas, serous/liquid or semisolid material.
Pseudocyst? an abnormal or dilated space resembling a cyst but not lined with epithelium
Periapical granuloma? etiology? result of necrotic pulp tissue and by-products resulting from inflammatory process that has damaged the tissue at the apex of the tooth i-e trauma, perio disease, fracture.
Pathogenesis of Periapical Granuloma diseased tissue causes granulation tissue to accumulate at the apex of the tooth; pulp becomes necrotic (irreversible pulpitis); poss. nonvital tooth
Location of periapical Granuloma Apex of the tooth
radiographic appearance of Periapical Granuloma round or ovoid translucent lesion
Cells in Periapical Granuloma that help to fight infection? Plasma cells, neutrophils, macrophages, eosinophils
Radicular cyst/“periapical cyst” Always associated with a nonvital tooth
Common causes of Radicular cyst? Location? caries, trauma, periodontal disease apex of a nonvital tooth; favors the mx anterior teeth
Epidemiology of Radicular Cyst? most commonly occurring inflammatory cyst/tooth cyst of the jaw; adults; mean age of 30
Microscopic features of Radicular cyst? non-keratinized epithelial lining w/necrotic debris & inflammation infiltrate
Pathogenesis of Radicular cyst? radiographically? Derived from the rests of Malassez of perio ligament blunting of the root (resorption)
Aneurysmal bone cyst? Benign lesion/pseudocyst that is blood filled A localized dilatation of an artery or a vein
Pseudocysts? False cyst
where does aneurysmal bone cyst arises from? prior trauma or some genetic components
Aneurysmal bone cyst is seen in? less than 30 years of age; sl. more females
radiographic characteristics and tx of Aneurysmal bone cyst? unilocular or mutilocular lesions removal of lesion and curettage
Traumatic bone cyst? Simple bone cyst thought to be caused by trauma
Epidemiology and pathogenesis of traumatic bone cyst? location? 10-20 year old age group may be empty or filled with a small amount of fluid (blood & bone products) Mand.
Radiographic charac. of Traumatic bone cyst? "scalloping cyst” or scalloping between teeth; honeycomb appearance
Cemento-osseous dysplasia Etiology? unknown but condition is considered reactive or developmental (related to a defect in the bone and/or cementum remolding)
Cemento? Cementum
Osseous Bone
Where can Cemento-osseous dysplasia develop? Can develop in mandibular area, posterior area.
Microscopic Features of Cemento-osseous dysplasia? contains fibrous connective tissue that can be seen with bone and cementum in varying amounts
Location of Cemento-osseous dysplasia? Apex of the vital teeth
Static (Stafne) bone cyst? defect in the mandible that surrounds salivary gland tissue
Location of Static bone cyst? inferior to the md canal and happens during development
static? lacking in movement, action, or change, especially in a way viewed as undesirable or uninteresting.
Lateral Periodontal Cyst? Epidemiology? Location? odontogenic, nonkeratinized developmental cyst 30 years and older; > males md premolar-canine; on lateral surface Asymptomatic but adjacent teeth are vital
Dentigerous Cyst? Second most common cyst of the jaw arises from a cystic change in the dental follicle following crown formation forms around crowns of unerupted tooth
Pathogenesis of Dentigerous Cyst? fluid between formed crown and reduced enamel epithelium
Location of Dentigerous Cyst? cyst is attached at CEJ; most common location is unerupted third molars; impacted, odontoma, supernumerary teeth
Eruption cyst/“eruption hematoma” caused by the accumulation of fluid and blood between the crown of an erupting tooth and the reduced enamel organ, due to trauma
Epidemiology/location/Clinical characteristics of Dentigerous Cyst? deciduous teeth and perm molars of children crest of alveolar ridge/gingiva bluish swelling of the tissue with a dome-shape
Odontogenic Keratocyst (OKC)? Develops from dental lamina or its remnants. more common in male
Location of OKC? Posterior mandibular location is frequent (can occupy most of the ramus)
Clinical Characteristics of OKC? large enough to displace teeth and extend through the cancellous bone into the oral cavity; as jaw weakens it may fracture
Calcifying Odontogenic Cyst? calcifying cyst derived from reduced-enamel epithelium or dental lamina remnants
Radiographic Calcifying Odontogenic Cyst? radiodencities (calcified material) and radiolucent properties
Microscopic feature of Calcifying Odontogenic Cyst? ghost cells”, epithelial cells that appear to have pink cytoplasm and have no nucleus; calcifications seen
Gingival Cyst? Clinical characteristics? Location? Nodules are multiple small cysts that disappear and rupture over time Md canine / premolar area. soft tissue/gingiva
Nasopalatine/incisive Canal Cyst? arises from epithelial remnants of the embryologic structure of the nasopalatine ducts. adults 40-60 year old, males
location of Nasopalatine/incisive Canal Cyst? radiographically? nasopalatine canal; between the mx central incisors heart-shaped
Median Palatine Cyst? Rare fissural cyst believed to develop from entrapped epithelium along the embryonic line of fusion in the two lateral mx processes that fuse to make the hard palate.
Location of Median Palatine Cyst? apically centered toward the midline hard palate
Median Mandibular Cyst? Rare Midline of mandible Well-defined radiolucency below apices of md incisors Surgical excision
Adenomatoid odontogenic tumor? Benign neoplasm of epithelial tissue; epithelial odontogenic tumor with a dense fibrous connective tissue capsule. facial swelling
Location/epidemiology of Adenomatoid odontogenic tumor? usually surrounds the crown of a tooth/impacted tooth; anterior mx. seen in an adolescent or young adult; females
Odontogenic myxoma? Derived from odontogenic ectomesenchyme, and it originates in the periodontal ligament or dental pulp. capable of rapid growth . Root resorption and displacement may be seen in some cases
Myxomas have also been described as? “step ladder” or “honeycombed” appearance.
Ameloblastic fibroma? The lesions are composed of neoplastic epithelium and neoplastic myxomatous connective tissue and are usually associated with third molars. mixed odontogenic tumor; rare
Perioral and Intraoral Characteristics of Ameloblastic fibroma? no pain with any swelling that may occur. has potential for extensive growth causing jaw expansion.
Created by: Zbutt