Odontogenic Tumors.ppt

8/10/2019 Odontogenic Tumors.ppt

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D R S A T Y A N A R A I N , M D S

Odontogenic Tumors


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OdontogenicTumors

Epithelial Mixed Mesodermal


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EpithelialOdontogenic

Tumors

AmeloblastomaAdenomatoidodontogenic

tumor

Calcifyingepithelial

odontogenictumor


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Ameloblastoma

This a true neoplasm ofodontogenic epithelium

It is an aggressive

neoplasm the arises fromthe remnants of the dentallamina and dental organ(odontogenic epithelium)


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Ameloblastoma

Benign, locally aggressiveodontogenic tumor. Usually itslowly grows as painless swelling ofthe affected site.

It can occur at any age.

Localized invasion into thesurrounding bone.

80-95% in the mandible (posteriorbody, ramus region). In the maxilla

mostly in the premolar-molarregion.


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Ameloblastoma

Unilocular (small lesions).Multilocular (large discrete areas orhoneycomb appearance)

Smooth, well-defined, well-corticated margins

Adjacent teeth are often displacedand resorbed.

It causes extensive bone expansion.

Incomplete removal can result inrecurrence.


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Ameloblastoma
http://www.usc.edu/hsc/dental/PTHL312abc/312b/10/IMGs/141big.htmlhttp://www.usc.edu/hsc/dental/PTHL312abc/312b/10/IMGs/140big.html


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Ameloblastoma


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Adenomatoid Odontogenic Tumor("Adenoameloblastoma")

These are uncommon ,nonaggressive tumors of

odontoginc epthilum.


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Adenomatoid odontogenic tumor

Features

Benign. Relatively rare.

It occurs in young patients (70% of casesin patients younger than 20 years).

Most common site: anterior maxilla.

Often surrounds an entire uneruptedtooth (most commonly the canine).

Usually well defined, well corticated.Some tumors are totally radiolucent;others show evidence of internalclassification.


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Calcifying epithelial odontogenic tumor(Pindborg tumor

These are rareneoplasms of the tooth

producing apparuts.


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Calcifying epithelial odontogenic tumor(Pindborg tumor

Rare benign neoplasm.

It occurs more often in middle-aged patients.

Usually in mandible.

Small lesions may be radiolucent.In advanced stages irregularlysized calcifications may bescattered in the radiolucency.

It can cause displacement and

impaction of teeth.


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MixedOdontogenic

Tumors

OdontomasAmeloblastic

fibro-odontomaAmeloblastic

fibromaAmeloblastic

odontomaOdontomas


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Odontomas

It is a tumor that isradiogrphically andhistologicallycharacterized by the

production of matureenamel , dentin ,cementum and pulptissue .

Compound # complex


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Odontoma

Features

Relatively common lesion.

It usually occurs in young patients.

Usually asymptomatic.

Failure of eruption of a permanent toothmay be the first presenting symptom.It iscommonly found occlusal to the involvedtooth.


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Odontoma

Features

Two types: complex and compoundodontoma.

Complex odontoma is composed ofhaphazardly arranged dental hard andsoft tissues.

Compound odontoma is composed ofmany small "denticles" .

Well defined. The internal aspect isvery radiopaque in comparison tobone.


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Odontoma


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me o as c roma

These are benign mixedodontogenic tumors .

They are characterized by

neoplastic proliferation ofmaturing and earlyfunctional ameloblasts aswell as the primitive

mesnchymel componentsof the dental papilla


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Ameloblastic fibroma

Benign Rare. Occurs in children andadolescents.

Most common site: mandible posteriorregion.

Often associated with an uneruptedtooth.

Well defined, well corticated. Smalllesions are monolocular. Large lesions

are multilocular.

It may cause displacement of adjacentteeth. Large lesions causebuccal/lingual expansion.


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Ameloblastic fibroma


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Ameloblasticfibro-odontoma

This is an extremely rare lesion. It consists ofelements of ameloblastic fibroma with smallsegments of enamel and dentin.


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Mesodermal

OdontogenicTumors

Odontogenicmyxoma

(myxofibroma)

Cemento-blastoma

Odontogenicfibroma

Odontogenic m oma ( fib )


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Odontogenic myxoma (myxofibroma)

They are benign,intraosseous neoplasmsthat arise from the

mesenchymal portion ofthe dental papilla.

Od i


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Features

It represents approximately 3 - 6%of all odontogenic tumors. It ispainless and grows slowly.

It can occur at any age but mostcommonly in the second and thirddecades of life.

More often affect the mandible(molar/premolar region).

Od i


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Features

Typically multilocular (internalsepta- strings of a tennis racket orhoneycomb appearance). Largelesions can have the sun rayappearance of an osteosarcoma.

Often well-defined.

Adjacent teeth can be displaced butrarely resorbed. It causes less bone

expansion than in other benigntumors.

Od i


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emen o as oma


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emen o as oma

This is a slow growingmesenchymal neoplasmscomposed principally ofcementum.


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Cementoblastoma

Features

Benign neoplasm. Most commonlyin the second and third decade.

Site: usually mandibular premolarand molar regions.

Attached to the root of the affectedtooth. Tooth displacement,resorption are common.

Pain in 50% of the cases, swelling.

When radiopaque is usuallysurrounded by a thin radiolucenthalo.


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Radiographic Features

Location:

Periphery:well defined ROwith RL hallo surrounding thecalcified mass.

Internal structure:mixed RL-RO leseions may be amorphous

Effect on surrounding tissues:

expansion, external rootresorption


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CEMENTOBLASTOMA

on ogen c


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on ogen cfibroma

Features

Rare neoplasm. More often betweenthe ages 10 and 40 years.

Asymptomatic or swelling and toothmobility

More common sites: mandible(premolar-molar region), maxilla(anterior region)

Small lesions are usually unilocular,and larger lesions multilocular.

Well-defined margins.

Adjacent teeth: often displaced,impaction, root resorption.


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Odontogenic Tumors.ppt

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