FIBRO OSSEOUS LESIONS OF JAW
Fibro Osseous Lesions of Jaw
• It is variety of disorders of the jaw bones
characterized histologically by replacement
of normal bone by cellular fibrous tissue
within which varying amount of
predominantly woven bone and acellular
islands of mineralized tissue develops.
• These lesions can not be distinguished by
histology alone.
Fibro Osseous Lesions of Jaw
• Their diagnosis is done by clinical and
radiographic features.
• These lesions are divided in the groups.
A. OSSEOUS DYSPLASIA
– Fibrous dysphasia
– Monostotic
– Polyostotic
– Cemento osseous displasia, periapical cemental
dysplasia, focal cemento osseous dsplasia,
Gigantiform dysplasia
Fibro Osseous Lesions of Jaw
B. BENIGN NEOPLASIA
– Ossifying fibroma
– Cemento ossifying fibroma
Fibrous Dysplasia of Bone
• It is the disease of the bone involving several
bones in the body
• Two terms are applied for the disease
Monostotic and Polyostotic
Monostotic Fibrous Dysplasia
• It is common than the polyostotic form
• Any bone may be involve in the body lesion
arises most frequently in limb bone, rib or
skull particularly the jaws
• In Jaw bones more common in maxilla than
mandible
Monostotic Fibrous Dysplasia
• When Maxilla affected, the adjacent bones
such as Zygoma and sphenoid bone may also
be involved and then the disease is not
strictly monostotic, How ever the distribution
is restricted to contiguous bones, the
anatomical area the pattern is not typically
associated with polyostotic disease.
Monostotic Fibrous Dysplasia
• For these reasons, it has been suggested that
the term is called Craniofacial Fibrous
Dysplasia in such circumstances.
• The majority of the patients are seen in
childhood and adolescence, but occasionally
in adults which diagnosed late
• It is pain less swelling of the Jaws gradually
increasing which is not well cercumscribed
and causes increasing facial asymmetry.
Monostotic Fibrous Dysplasia
• The enlargement is usually smooth often
fusiform in outline and is more pronounced
buccally than lingually or palatally.
• When the maxilla is involved there is usually
increased prominency of cheak and buccal
expansion distal to canine, which extend to
involve tubrasity.
Monostotic Fibrous Dysplasia
• The canine fossa is obliterated and involve
the maxillary sinus in Maxillary lesions.
• In maxillary lesions Zygomatic process and
floor of the orbit and orbital contents may be
displaced
• In the some cases the growth is more rapid
and extensive, the exohthemass and
proptosis.
Monostotic Fibrous Dysplasia
• Mandibular lesions occur more frequently in
the molar and pre molar region if the lower
border is involve there may be obvious
protuberance and increase in depth of the
jaw.
• In either jaw there may be some
malalignment tipping or displacement of the
teeth and in children any teeth involved by
the lesion may fail to erupt.
X-RAY FINDINGS
• The lesion may be radiolucent initially but as
degree of trabeculation increases the lesion
become malted and opaque.
• Lesion appears ground-glass or orange-peelstippling effect.
• Roots of teeth in involved area may be
separated and teeth may be displaced.