Download - Developmental Disturbance
-
7/30/2019 Developmental Disturbance
1/4
((Developmental disturbances))
What does developmental disturbance mean??
It means the changes due to development without specific
cause; without infection, neoplasia, tumor, reactive changes or
soft tissue tumor.
-
7/30/2019 Developmental Disturbance
2/4
Disturbances in size
microdontia Macrodontia
generalized localized generalized localized
true relative Ex: peg lateral:
since max.
Lateral incisor istaper , it's
smaller than
normal one.3rd molar
especially max. 3rd
molar could be
seen rounded,
small and conical,
so they may be
very small
compared to
adjacent molars .
supernumerary:
true relative Ex:
Hemifacial
hypertrophy:condition in
which half of
the
teeth will be
increased in
the size, so
there will be
increasing in
the size of
half of the
face.
when the
dimension
of the
teeth is
less than
the
normal
sizes of
normal
teeth
if the teeth
are.
normal in
size but
the jaw is
abnormally
big.
if teeth
size is
more
than
normal
sizes of
normal
teeth (it
could be
occurreddue to
hormone
change).
If the
jaw is
small
and the
teeth
are
normal.
singleone
extra
tooth
multiplemore than
one extra
tooth
-Radiculomegaly: when size of the root of the tooth is
increased and this usually occurred in mand.
Canine . So there roots will be bigger than normal
ones.
-
7/30/2019 Developmental Disturbance
3/4
-Anodontia: complete absence of teeth.
-Hypodontia: decreasing in teeth number (less thannormal).
-ectodermal dysplasia: Syndrome in which there are
no teeth (anodontia), and its abnormality in
epithelium in some components of the body
especially which are related to teeth.
hypohydrotic dysplasia
definition Features causes
subtype of the
syndromein
which sweet
glands are alsodefective so the
patients Will be
abnormal by
missing normal
sweating so
they won't
tolerate high
temperature.
abnormal hair- very
thin hair- , protruded
upper lip, bulging in
frontal bone, noeyedraw, very thin
eyelashes and there
will be defective sweat
glands and anodontia
and hypodontia.
the defect in this
syndrome is
transmembrane
protein inkeratinocytes
affecting
.teeth, sweat glands
and hair follicles.
Note: if the parent congenitally missing teeth some of
the children will also have congenitally missing it
-For the permanent teeth: lateral incisor, 3rd molar,
second premolar especially upper.
-
7/30/2019 Developmental Disturbance
4/4
-For the deciduous teeth: maxillary laterals are the most
common congenitally absent teeth.
Supernumerary teeth
In maxilla In mandible In deciduous supplementalteeth
The shape
1-Mesiodense:supernumerary
tooth that erupt
in the midline
of maxilla
(mesio; it erupted
mesially to bothcentral incisors).
2-Paramolar :extra molar
(fourth molar)
which.
erupts distally to
the last molar.
3- Maxillary
lateral incisor
Premolars(most
common) ,fourth
molars and incisors.
Maxillary
lateral incisor
may have
supernumerary
teeth
supernumerous
teeth which
morphologically
.resemble those
of normal series
conical
(indicates
microdontia
)or
normal.
Supernumerary teeth maybeErupted or impacted
.