This document discusses histopathology and different types of odontomas. It describes compound odontomas as well-organized tooth-like structures containing orderly dental tissues, while complex odontomas contain disorganized odental tissues. Both are considered hamartomatous malformations that result from defects in the development and differentiation of odontogenic tissues, though compound odontomas specifically involve defects in morphodifferentiation. Causes may include local trauma, infection, genetics, or disturbances during tooth germ development.

1. HISTOPATHOLOGY
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5. Compound odontome
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9. Complex odontome
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10.  The term odontoma is used as a descriptor for any
tumor of odontogenic origin.
 However, they have become known as mixed
odontogenic tumors because they are composed of
both epithelial and ectomesenchymal components.
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11.  Both these tissues and their cells appear normal
morphologically, but have a defect in their structural
arrangement.
 Hence, it is said that odontomas are
hamartomatous lesions or malformations rather
than true neoplasm.
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12. COMPOUND ODONTOMA
 Well –organized tooth like
structure.
 A malformation in which
all the dental tissues are
represented in more
orderly pattern than in the
complex odontoma.
COMPLEX ODONTOMA
 A mass of disorganized
odontogenic tissues.
 A malformation in which all
the dental tissues are
represented, individual
tissues being mainly well
formed but occurring more
or less in a disorderly
manner.
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13.  The odontomas are of the odontogenic origin.
 It is considered a self – limiting developmental
anomaly or hamartomatous malformation .
 Some authors suggest that odontomas increase in
size with age.
 However it is very questionable.
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14.  The complex odontomas may be caused by local
trauma, infection, family history, genetic mutation
and cell rest of Serres.
 There is an altered or unsuccessful
ectomesenchymal interaction in the earliest phase
of tooth germ development.
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15.  Alteration or disturbances in the subsequent
phases may also lead to odontoma formation.
 The complex odontomas arise due to defect in
morphodifferentiation and histodifferentiation.
 Alteration in the mineralization mechanisms with
modifications of the mineral component in the
enamel may lead to incomplete maturation.
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16.  As the complex odontoma, the compound odontoma is
also of odontogenic origin.
 The pathogenesis of which remains the same as
complex odontoma.
 However , compound odontomas result from the defect
arising in the morphodifferentiation.
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