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.


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.


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.


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

.

developmental disturbance

Documents