4.
Cyst is defined as a pathological cavity filled with
fluid which is solid semisolid or gaseous form
which may or may not be lined by epithelium
Cyst can occur within bone or soft tissues
They may be asymptomatic or associated with
swelling and pain
5.
Cysts are generally slow growing, expansile
lesions
They grow by hydraulic expansion
Radiographically
,
they
often
appear
radiolucency surrounded by thin radioopaque
border
8.
CLASSIFICATION BY TISSUE OF ORIGIN
DERIVED FROM RESTS OF MALASSEZ
Periapical cyst
Residual cyst
DERIVED FROM DENTAL LAMINA (RESTS OF SERRES)
Odontogenic kertocyst
Gingival cyst of newborn
Gingival cyst of adult
11.
CLINICAL FEATURES
The cyst is always associated initially with the
crown of an impacted, embedded or unerupted
tooth
Sites: mandibular and maxillary third molar and
maxillary cuspid areas
Most dentigerous cysts are solitary
Expansion
of
bone
with
subsequent
facial
asymmetry, extreme displacement of teeth, sever
root resorption of adjacent teeth and pain
12.
RADIOGRAPHIC FEATURES
Reveal a radiolucent area associated with an
unerupted tooth crown
The radiolucent area is surrounded by a thin
sclerotic line representing bony reaction
13.
Three radiological variations:-
Central variety, crown is enveloped symmetrically
Lateral type, results from dilatation of the follicle
on one aspect of the crown
Circumferential type, follicle expands and entire
tooth is enveloped by cyst
DIFFERENTIAL DIAGNOSIS
Ameloblastoma and ameloblastic fibroma
Adenomatoid odontogenic tumour
Calcifying odontogenic cyst
15.
Eruption cyst is defined as an odontogenic cyst that
surrounds a tooth crown that has erupted through
bone but not soft tissue and is clinically visible as a
soft fluctuant mass on the alveolar ridges
16.
CLINICAL FEATURES
Found in children and occcasionally in adults
Common site – anterior to first molar
Lesion appear as circumscribed, fluctuant, translucent
swelling of the alveolar ridge over the site of the
erupting tooth
When the circumcoronal cystic cavity contains blood,
swelling appears purple or deep blue; hence the term
ERUPTION HAEMATOMA
17.
RADIOGRAPHIC FEATURES
It may show soft tissue shadow since the cyst is
confined within it and there is usually no bone
involvement
DIFFERENTIAL DIAGNOSIS
Dentigerous cyst
18.
A cyst derived from the remnants of the dental
lamina, with a distinctive lining of six to ten cells in
thickness and exhibits a basal cell layer of
palisaded
parakeratin
cells
and
a
surface
of
corrugated
19.
CLINICAL FEATURES
The cyst may occur at any age
Peak incidence is in 2nd and 3rd decades of life
Predilection for occurrence in males
Common site:- third molar area
Other features: pain, soft-tissue swelling and
expansion of bone and neurological manifestations
– parasthesia of lips
20.
RADIOGRAPHIC FEATURES
They are unilocular, presenting a well-defined
peripheral rim
Scalloping of the border represents variations in
the growth pattern of cyst
23.
CLINICAL FEATURES
Small discrete white swellings of the alveolar ridge
Lesion appear to be asymptomatic and donot
produce discomfort in infants
24.
A small developmental odontogenic cyst of the
gingival soft tissue derived from the rests of the
dental lamina, containing a lining of embryonic
epithelium of cuboidal cells and distinctive focal
thickenings
25.
CLINICAL FEATURES
Lesion is small,
well-cirumscribed
, painless,
swelling of the gingiva
Lesion is of same color as the adjacent normal
mucosa and 1cm in diameter
It occurs in free or attachment gingiva and gingival
papilla
26.
RADIOGRAPHIC FEATURES
It is a soft tissue lesion and if it enlarges to
sufficient size, it causes superficial erosion of the
cortical plate of bone
DIFFERENTIAL DIAGNOSIS
Lateral periodontal cyst
27.
A slow growing, non expansile
developmental
odontogenic cyst derived from one or more rests of
the dental lamina, containing an embryonic lining
of one to three cuboidal cells and distinctive focal
thickenings
28.
CLINICAL FEATURES
Predilection for occurrence in males
Site: mandibular bicuspid/cuspid/incisor area
When the cyst is located on labial surface of the
root, there is a slight mass
29.
RADIOGRAPHIC FEATURES
Radiolucent area in apposition to the lateral surface
of a tooth root
Lesion is small, border is definitive and surrounded
by thin layer of sclerotic bone
31.
A rare, well circumscribed, solid or cystic lesion
derived from odontogenic epithelium that contains
ghost cells and spherical calcifications
32.
CLINICAL FEATURES
It is more common in females
It occurs anterior to first molar
It is a slow growing , painless, non-tender swelling
which causes expansion and destruction of cortical
plates
The cystic mass may become palpable and discharging
33.
RADIOGRAPHIC FEATURES
The central lesion may appear as a cyst like
radiolucency with variable margins which may be
smooth well defined or irregular in shape with
poorly defined borders
Perforation of cortical plates can be seen
35.
A large solitary or multilocular odontogenic cyst
derived from rests of dental lamina, consisting of a
stratified
squamous
epithelium
numerous mucus-secreting cells
containing
36.
CLINICAL FEATURES
A slight male predilection
Common site is anterior mandible
Lesion shows slow progressive growth, painless
and locally destructive
38.
Periapical cysts results when rests of malassez in
the
periodontal
ligament
are
stimulated
to
proliferate and undergo cystic degeneration by
inflammatory products which are associated with
necrosis of the pulp
39.
CLINICAL FEATURES
The tooth is painful and sensitive to percussion
It represents a chronic inflammatory process and
develops over a prolonged period of time
This acute exacerbation leads to abscess, then
proceed to a cellulitis and form a draining fistula
40.
RADIOGRAPHIC FEATURES
A peri or para apical round or oval radiolucency of
variable size which is well-delineated and marked
with a radioopaque rim
42.
Residual cyst are retained periapical cysts from
teeth that have been removed
CLINICAL FEATURES
Usually
asymptomatic
and
found
radiographic examinations
It is found in tooth bearing area
on
routine
43.
RADIOGRAPHIC FEATURES
It may present well defined radiolucency that can
vary in size from a few mm to several cm; with thin
radioopaque margins
DIFFERENTIAL DIAGNOSIS
Primordial cyst
Keratocyst
Traumatic cyst
Ameloblastoma
44.
Paradental cyst is an inflammatory cyst which
develops on the lateral surface of a tooth root
45.
CLINICAL FEATURES
It occurs in younger age group
Seen in third decades of life
Male predilection
It is usually associated with third molar on buccal
surface and covers the bifurcation
The tooth is usually vital
It may occur bilaterally
46.
RADIOGRAPHIC FEATURES
These are the non-widening of the periodontal
ligamentspace and the lesion was superimposed on
the buccal root surface
When there was a distal as well as a buccal
radiolucency, the distal element was separate from
distinct distal follicular space
48.
S M Balaji – textbook of oral and maxillofacial
surgery
Neelima
Malik
–
textbook
of
oral
maxillofacial surgery
Shafers – textbook of oral pathology
Freny Karjodhkar – textbook of radiology
and