benign epithelial tumors/prosthodontic courses
Post on 23-Jan-2018
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BENIGN TUMORS OF THE EPITHELIAL TISSUE ORIGIN
INDIAN DENTAL ACADEMYLeader in continuing Dental Education
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OBJECTIVES
At the end of the lecture student should be able to-
-Describe classification, incidence, etiology, clinical features, histopathological features of papilloma– Describe classification, incidence, etiology, clinical features, histopathological features of squamous acanthoma–Describe classification, incidence, etiology, clinical features, histopathological features of keratoacanthoma
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PAPILLOMA CLINICAL FEATURES
Common benign neoplasm originating from surface epithelium
Exophytic growth made of finger like projections
Roughened, Verrucous or cauliflower like appearance
Well circumscribed, pedunculated, Found on tongue, lips, buccal mucosa,
gingiva & palate Few mms in diameter to several cms
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Verruca vulgaris is a tumor of skin analogo us to oral papillomaPebbly lesions are seen in multiple hamartomas & hamartoma and neoplasia syndrome (cowdens syndrome).
It is an autosomal dominant disease characterized by facial trichilemomas asso. With gastrointestinal tract, thyroid, CNS & mucocutaneous abnormalities as well as oral lesions
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Multiple papllilomas are seen in focal dermal hypoplasia syndrome
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HISTOLOGIC FEATURES Long thin finger like projections
extending above the surface of mucosa
Continuous layer of str.sq. epithelium
Thin central conn. tissue core supports nutrients blood vessels
Proliferation of spinous layer in pappillary fashion
Conn. tissue not considered a part of neoplastic element
Chr. inflammatory cells persent Mitosis sometimes present www.indiandetalacademy.com
Treatment
-Excision through the pedicle
Mature stratified squamous epithelium
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SQAUMOUS ACANTHOMA
Uncommon lesion Reactive phenomenon of epithelium Occurs on any site of the oral mucosa Usually in older adults small, flat or elevated, white, sessile or pedunculated
lesion on the mucosa Epithelial proliferation of markedly thickened layer of
orthokeratin & underlying spinous layer of the cells Recur after excision
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KERATOACANTHOMA(self-healing carcinoma,molluscum
psuedocarcinomatum,molluscum sebaceum, verrucoma)
Resembles epidermoid carcinoma
Etiology genetic & viral factors
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Clinical features
Twice frequently seen in men 50-70yrs 8.1% seen on lips Lesion appears as elevated & umbilicated or
crateriform with a depressed central core or plug Painful/ lympahadenopathy +nt
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Begins as small, firm nodule
Develops to full size in 4- 8 weeks
Histological features Hyperplastic sq. epith
growing into underlying conn tissue
Thickened layer of para or orthokeratin wit central plugging
Central keratin plug
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•Epithelium occasionally dysplastic
•At the margins normal adjacent epithelium is elevated towards the central portion of the crater
Treatment•surgical excision
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Summary slide
Classification Incidence etiology Clinical features Histological features
of papilloma, squamous acanthoma, & keratoacanthoma.
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THANK YOU !
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